1) The displacement is 0 mi. Option A
2) The average speed is 20 mi/hr. Option C
3) The average velocity is 0 mi/hr. option A
What is the speed?We know that when we talk about the speed, we would look at the ratio of the average distance to the average time that is taken and this would span the entire journey not only a section of the journey.
We must note that the displacement is a vector quantity and as such, we have to look at the direction of the motion of the object.
Displacement = 5 miles - 5 miles = 0 miles
Average speed = Total distance/ Time = 5 miles + 5 miles/ 0.5 hr = 20 mi/hr
Average velocity = Displacement/Time = 0 miles// 0.5 hr = 0 mi/hr
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At what separation will two charges, each of magnitude 6.0 μC, exert a force of 0.70 N on
each other?
The given magnitude of the two charges are 6μc and they exert a force of 0.7N on each other. We need to find the distance of separation between the particles.
By Coloumb's Law :-
[tex]\sf\longrightarrow F =\dfrac{1}{4\pi\epsilon_0} \dfrac{q_1q_2}{r^2} [/tex]
where
q1 and q2 are the two charges r is the distance of separation1/4πe0 = 9 * 10⁹Substitute the respective values,
[tex]\sf\longrightarrow [/tex] 0.7 = {(9*10⁹) (6*6) (10-⁶ *10-⁶) }/ r²
[tex]\sf\longrightarrow [/tex] r² = (36*9 * 10-³)/0.7
[tex]\sf\longrightarrow [/tex] r =√{ 36*9*10-³)/√7 m
[tex]\sf\longrightarrow [/tex] r = 6* 3* 10-¹ /√70 m
[tex]\sf\longrightarrow [/tex] r = 0.21 m
And we are done!
HELPOO QUESTIOJ 11!!!!!!!
No, because science requires all the evidence collected to be analyzed.
What do you mean by Experiment?
An experiment is a process or study that is conducted in order to test a hypothesis, discover a new fact, or demonstrate a known fact. Experiments are often conducted to gain a better understanding of a process or system, or to explore how different variables interact with each other.
Science requires all evidence to be collected and analyzed in order to ensure that all possible explanations are considered and that the conclusions drawn are based on the most accurate information available. This can include collecting data from a variety of sources, such as experiments, observations, and other studies. The evidence must then be analyzed to draw valid conclusions and identify any potential flaws or sources of bias. This process allows scientists to properly evaluate their hypotheses and make informed decisions.
Hence, Option A is correct.
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Compute g for the surface of a planet whose radius is haif that of the Earth and whose mass double that of the Earth.
The gravitational force of the planet is 53.36 x 10-11 m3/kgs2.
What is gravitational force?Gravitational force is an attractive force between two objects that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
G = 6.67 x 10-11 m3/kgs2
The gravitational force (g) of a planet is determined by its mass and radius. Since the mass of the planet is double that of the Earth and its radius is half that of the Earth, we can calculate the gravitational force of the planet by using the equation:
g = (G * M) / (R^2)
Where G is the universal gravitational constant, M is the mass of the planet, and R is the radius of the planet.
Plugging in the values for the planet in question, we get:
g = (6.67 x 10-11 m3/kgs2 * 2M) / (0.5R^2)
g = (13.34 x 10-11 m3/kgs2) / (0.25R^2)
g = 53.36 x 10-11 m3/kgs2
Therefore, the gravitational force of the planet is 53.36 x 10-11 m3/kgs2.
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__________ aircraft are those whose weight or center-of-gravity limits can sometimes be exceeded by loading arrangements normally used in tactical operations. Therefore, limited loading control is needed.
Correct answer:- Class 1
Class 1 aircraft are those whose weight or center-of-gravity limits can sometimes be exceeded by loading arrangements normally used in tactical operations. Therefore, limited loading control is needed.
Who is in charge of maintaining the aircraft's weight and balance record?The aircraft's airframe and powerplant (A&P) technician or repairman keeps accurate weight and balance records, noting any adjustments made as a result of repairs or modifications.
What happens when an airplane is overloaded behind its center of gravity?Similar to an airplane, if its center of gravity is too far off the range, it will be heavier on one side than the other and the pilot may lose control of it. The aircraft's longitudinal imbalance is what causes the nose and/or tail to be heavy.
Why is the center of gravity in an airplane so crucial?An aircraft's center of gravity (CG) center of gravity (CG) of an aircraft is the point at which, if suspended at that location, the aircraft would balance. The center of gravity must stay within predetermined boundaries set by the aircraft manufacturer since it impacts the stability of the airplane.
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Class 1 aircraft are those whose centre of gravity or weight constraints may occasionally be exceeded by loading configurations typically used in tactical missions. As a result, restricted loading control is required.
A&P technician or repairman for the aircraft maintains accurate weight and balance records, noting any alterations made as a result of repairs or modifications. Like an aeroplane, if it has a centre of gravity that is too far off the range, it will be heavier on one side than the other and the pilot may lose control. The nose and/or tail of the aircraft are disproportionately heavy due to the longitudinal imbalance. The point at which, if held at that location, an aircraft would be in balance is called the centre of gravity (CG).
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a body of mass 2kg falls freely from rest through a height of 50m and came to rest having penetrated 5.0cm of sand . calculate:
1. the velocity with which the body Hits the sand.
2. the time taken in falling.
3. the average force exerted by the sand in bringing the body to rest.
Velocity with which the body Hits the Sand is 78.59 m/s.
What is Velocity?Velocity is a vector measurement of the rate and direction of an object's motion. Velocity is the rate at which an object's position changes over a period of time, and is usually expressed in terms of distance traveled per unit of time (e.g., meters per second).
1. Velocity with which the body Hits the Sand:
The velocity of the body when it hits the sand can be determined using the equation of motion:
v = √2gh
v = √2 x 9.81 x 50
v = 78.59 m/s
2. Time taken in Falling:
The time taken in falling can be determined using the equation of motion:
t = 2h/g
t = 2 x 50/9.81
t = 10.2 seconds
3. Average Force Exerted by the Sand:
The average force exerted by the sand can be determined using the equation:
F = mv²/2d
F = 2 x (78.59)² / 2 x 0.05
F = 6269.68 N
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A gas has a pressure of 60.0 kPa at 40.0°C. If the pressure on the tank is changed to standard atmospheric pressure (101.3 kPa), what is the new temperature?
The sound level of the carton has an impact on the pressure as well. The gasses have less room to move around in a container if the volume is reduced.
How much atmospheric pressure is typical?At sea level on Earth, the average or nearly average atmospheric pressure is 1013.25 millibars, as well as roughly 14.7 pounds per inch. My car's tires have a gauge pressure that is slightly higher than twice that amount.
How is the pressure in the atmosphere gauged?An instrument known as a barometer is used to measure air pressure, also known as barometric pressure. The air layers that surround Earth are known as the atmosphere. As gravity drags that air to Earth, it exerts pressure on everything it touches. The pressure is measured by barometers.
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glass plate of dimension 40 *20 CM square is played on a table on which there is a layer of machine oil of thickness 0.02 mm the coefficient of viscosity of machine oil is 0.4 find the force required to draw the blade horizontally with the speed of 5 metre per second square
The force necessary to draw the blade horizontally with the speed of 5 metre per second is 14.7 N.
A good-quality measuring tape can be off by .50cm over a distance of 20m . What is the percentage of uncertainty?
The percentage of uncertainty in a good-quality measuring tape can be off by .50cm over a distance of 20m is given as 0.025 cm.
What is meant by percentage of uncertainty?If the measured value had been 100 units, the percent uncertainty would describe the uncertainty that would have resulted from that. The relative uncertainty is a comparable amount (or fractional uncertainty).
The formula is given as
δA / A * 100%
where A = 20
δA = uncertainty = 0.5 * 1 / 100
= 0.005
percentage uncertainty is 0.005 / 20 * 100
= 0.025
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I must choose two answer choices for this question.
Spacecraft X has twice the mass of Spacecraft Y. They orbit Earth at the same radius. Which of these must be true?
(A) X feels a greater gravitational force than Y
(B) X travels twice as fast as Y
(C) X takes twice as long to complete an orbit
(D) The orbital period of X is the same as Y
The mass of Spacecraft X is two times that of Spacecraft Y. Consequently, spacecraft X experiences a stronger gravitational pull than spacecraft Y. X also moves twice as quickly as Y. Option A and B are the Correct ones.
Mass of X is M1 and mass of Y is M2. So, M1=2×M2. Gravitation force is given as F=(G×M1×Mw)/ r^2.
So the gravitational force depends on mass and orbital radius. Since X and Y has the same orbital radius, so the force on them depends on the mass. As M1=2×M2 , so F1=2×F2.
So Spacecraft X feels more gravitational force than spacecraft Y.
The time period is proportional to the radius and mass . So X travels twice as fast as Y.
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Four very long straight parallel wires, located at the corners of a square of side l, carry equal currents Io perpendicular to the page as shown in Figure. Determine the magnitude and direction of B at the center C of the square.
The magnitude and direction of B at the center C of the square is
2µNIo/πL on every corner of square.
Given that four long straight parallel wires, located at the corners of a square carry equal currents perpendicular to the page.
Side of a square = L
current in square wire = Io
Here C is located at the center then distance from any corner point to center C be r. Here r acts as the hypotenuse such that r = L/√2
We know that electric field (B) = NI/2πr and is same at every point on square. Ba = Bb = Bc = Bd
B = µNIo/2π(L/√2)
B = √2µNIo/2πL
Bnet = 4 x Bcos45 = 4 x √2µNIo/2πL x 1/√2
Bnet = 2µNIo/πL
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A squirrel pushes a 1.1 kg Apple that is initially at rest on the ground. The net force on the Apple varies with time as shown below. What is the apple’s change in momentum between 0 ms and 20 ms?
The net force is defined as the total of all forces acting on an object. A mass can accelerate thanks to net force.
What is a net force?According to its definition, the net force is the total of all the forces operating on an object. Mass can be propelled forward by net force. In motion or at rest, another force exerts its influence on the body. When a system contains a sizable number of forces, the term "net force" is employed.
All of the forces that are applied to an object are added up to form the net force. In other words, the net force is the sum of all the forces, taking into mind that a force is a vector and that two forces that have the same magnitude but facing the opposite direction will cancel each other out.
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Two people are playing a game of tug a war with the rope attached to a mass of 25 kg at the center. The person pulling to the left pulls with force of 20 N. The person pulling to the right pulls with a force of 10 N.
Answer: To determine the acceleration and direction of the mass, we need to consider the net force acting on the mass. The net force is calculated by subtracting the force to the right from the force to the left:
Net force = 20 N - 10 N = 10 N to the left
Using Newton's second law (F = ma), we can determine the acceleration of the mass:
a = F / m = 10 N / 25 kg = 0.4 m/s² to the left
So the direction of the acceleration and the net force are to the left, which means the mass will move to the left.
Explanation:
Answer: What will happen is that that it will go to the left and it is because the person on the left is pulling harder than the person on the right.
Explanation: I have my ways :>
Have a great day!
A cat with a mass of 4.50 kilograms sits on a ledge 0.800 meters above the ground. If it jumps to the ground, how much kinetic energy will it have just as it reaches the ground?
The kinetic energy of the cat of mass 4.5 kg just as it reaches the ground is 35.28 J.
What is kinetic energy?This is the energy a body acquire during motion.
To calculate the kinetic energy the cat will have just as it reaches the ground.
Note: As the cat is about to reache the ground, all the potential energy is converted to kinetic energy.
Formula:
K.E = mgh.................. Equation 1Where:
K.E = Kinetic energym = Massg = Acceleration due to gravityh = HeightFrom the question,
Given:
m = 4.5 kgh = 0.8 mg = 9.8 m/s²Substitute these values into equation 1
K.E = 4.5×0.8×9.8K.E = 35.28 J.Hence, the kinetic energy of the cat is 35.28 J.
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A student is conducting an experiment to compare the resistivity of two unknown materials by using two wires, each made of one of the materials and each connected in circuit: The student measures the potential difference across and current in the wires. Which of the following must be the same to be able to compare the resistivities using just the potentia difference and current measurements? Select two answers The length of each wire The cross-sectional area of each wire The potential difference across each wire The current in each wire
The length of each wire and the cross-sectional area of each wire must be the same to be able to compare the resistivities using just the potential difference and current measurements.
According to reports, a student is utilizing two wires, each constructed of one of the materials and connected in a circuit, in an experiment to compare the resistivity of two unknown materials. The student is allegedly measuring the potential difference across and current in the wires. Using only the potential difference and the current measurement, we may compare the resistivity. As resistivity is directly proportional to length of wire and area of cross section we can say it is necessary to maintain these both measurements same as to keep the resistivity same.
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To compare the resistivities using only the potential difference and current measurements, each wire's length and cross-sectional area must be the same.
What is the wire's resistance?A wire's resistance is directly inversely correlated with its cross-sectional area and directly correlated with its length. Resistance is also influenced by the conductor's substance. A conductor's or circuit element's resistance typically rises as temperature rises.
How does the resistance of a wire vary with the size of its cross-section?It is inversely related to the wire's cross-sectional area. The resistance decreases with increasing wire cross section area and increases with decreasing cross section area.
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1. A 63.2 kg mountain climber, carrying a 16.4 kg backpack, hikes up to a base camp in
preparation for a climb the next day. If she climbs a vertical distance of 1.75 km, how
much gravitational potential energy has she gained?
Answer:
1,365,140J
Explanation:
The mountain climber has gained 1365170 joule gravitational potential energy.
What is potential energy?Potential energy is the energy that an object possesses as a result of its position in relation to other objects, internal tensions, electric charge, or other elements.
Mass of the mountain climber: M= 63.2 kg.
Mass of his backpack: m = 16.4 kg.
Total mass of the mountain climber and his backpack: (M+m)
= 63.2 kg +16.4 kg
= 79.6 kg.
Vertical distance: h = 1.75 km = 1750 m.
Hence, the gravitational potential energy, she has gained = (m+M)gh
= 79.6 kg × 9.80 m/s² × 1750 m.
= 1365170 joule.
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ALWAYS use significant figure rules. Remember that these rules apply to all numbers that are measurements. In working this problem, assume the value of "g" to be 9.8 m/s2 with two (2) significant digits unless otherwise stated. One complete wave passes a putrefying pile of poached pickerel in 0.50 seconds. The piled pickerel protrude 20 cm along the beach. Calculate its velocity. _____ cm/s 5.0 20. 10. 40.
Answer: 40 cm/s.
Explanation:
To solve this problem, we need to use the formula for velocity, which is velocity = distance/time.
We are given the time it takes for one wave to pass the pile of pickerel as 0.50 seconds and the distance that the pickerel protrude along the beach as 20 cm. Plugging these values into the formula gives us:
velocity = distance/time
= 20 cm / 0.50 s
= 40 cm/s
Since we are given the value of g with two significant digits, we should round our answer to the nearest whole number, giving us 40 cm/s.
1.
The temperature of the melting point of ice and that of boiling point of water
at normal atmospheric pressure are marked 40 and 200
respectively on a
certain thermometer. What is
a.
b.
the temperature
the thermometer
on this thermometer
is 80.
temperature is 60°C. Ans: 25°C, 136
in °C when the reading
reading when the
Answer:
I believe this is what you was asking for.
Explanation:
A. The temperature in °C when the reading on the thermometer is 80 is 60°C.
B. The reading when the temperature is 60°C on this thermometer is 136.
An atom transits from a site to a nearest-neighbor site every seconds. The probabilities of transiting to the right and left are p and q = 1-p respectively. -X (a) Calculate the average position of the atom at the time t = Nr, where N > 1; (b) Calculate the mean square value (z-7)² at the time t.
Answer:
I was just working on this now
z² - 0.8z - 98
Explanation:
To solve this problem, we first need to define some variables:
X: the average position of the atom at time t = Nr
p: the probability of transiting to the right
q: the probability of transiting to the left (q = 1-p)
N: the number of times the atom transits from one site to another
r: the time it takes for the atom to transit from one site to another
t: the total time for which we are calculating the average position
z: the mean square value of the atom's position at time t
With these definitions in mind, we can now proceed to solve the problem:
a. To calculate the average position of the atom at time t = Nr, we can use the following formula:
X = p*(X+1) + q*(X-1)
This formula states that the average position of the atom is equal to the probability of transiting to the right multiplied by the position one unit to the right, plus the probability of transiting to the left multiplied by the position one unit to the left.
Solving for X, we get:
X = (p-q)/(p+q)
Substituting p = 0.6 and q = 0.4, we get:
X = (0.6-0.4)/(0.6+0.4) = 0.2/1 = 0.2
This means that the average position of the atom at time t = Nr is 0.2 units to the right.
b. To calculate the mean square value (z-7)² at time t, we can use the following formula:
(z-7)² = p*((z+1)-7)² + q*((z-1)-7)²
This formula states that the mean square value is equal to the probability of transiting to the right multiplied by the square of the position one unit to the right minus 7, plus the probability of transiting to the left multiplied by the square of the position one unit to the left minus 7.
Solving for (z-7)², we get:
(z-7)² = p*(z+1-7)² + q*(z-1-7)²
= pz² + 2pz + p - 49 + qz² - 2qz - q - 49
= (p+q)*z² - 2(p-q)*z - 98
Substituting p = 0.6 and q = 0.4, we get:
(z-7)² = (0.6+0.4)*z² - 2(0.6-0.4)*z - 98
= z² - 0.8z - 98
This means that the mean square value (z-7)² at time t is a quadratic function of z.
the two arms of the l-shaped handle on the spigot of (figure 1) have a length ratio of 1:3√. At what angle theta do you want to pull down on the end of the handle to maximize the torque your force causes?
30 degree to the left of the vertical line.
60 degree to the right of the vertical line.
60 degree to the left of the vertical line.
45 degree to the right of the vertical line.
45 degree to the left of the vertical line.
30 degree to the right of the vertical line.
We would want to pull down on the end of the handle to maximize the torque your force causes at an angle of 45 degree to the left of the vertical line.
What is a vertical line?A vertical line is described as a straight line that moves only up and down and stays the same distance from left to right.
It is a one-dimensional figure that has no thickness and extends infinitely in both directions that are used in a variety of ways in mathematics, including graphing equations and drawing diagrams.
Vertical lines can also be used to show data in a linear fashion, such as in a line graph or a histogram.
We would want to pull down on the end of the handle to maximize the torque your force causes at an angle of 45 degree to the left of the vertical line because the maximum torque occurs when the force vector is aligned with the lever arm.
Since the ratio of the two arms of the handle is 1: square root, the handle forms a 45 degree angle with the vertical line.
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The basics of parking include using front, rear and side vehicle reference point limitations to establish the
appropriate positioning of the vehicle.
O a) True
O b) False
The given statement "The basics of parking include using front, rear and side vehicle reference point limitations to establish the appropriate positioning of the vehicle is true because a good driver must properly study his environment while parking. Therefore, the correct answer option is: A) true.
What is a blind spot?A blind spot can be defined as an area or portion to either side of an automobile vehicle (car), as well as the back (rear end) of a vehicle that is typically outside the field of vision of a driver, especially because it is not visible in the rear view mirror.
Who is a good driver?A good driver can be defined as an individual who has been trained and licensed to drive an automobile vehicle (car), while judiciously performing and obeying traffic signs, rules and regulations that do not pose a threat to the life and safety of other road users.
As a good driver, it is very important and critical to make use of your front, rear, and side vehicle reference point limitations through the mirrors, in order to establish an appropriate positioning of your automobile vehicle (car).
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The bucket shown below is lifted with 3 forces. Determine the force F¯2
that such that the resultant force is vertical with a magnitude of 373.15 N (resultant force points straight up). You are not given F2 or F3, but F1=249 N, θ2=26∘ and θ3=28∘, θ3=(arccos(5/3))
Answer:
220.87 N.
Explanation:
To determine the force F2 that is needed to balance the other forces and create a vertical resultant force with a magnitude of 373.15 N, we can use the principle of vector addition.
We know that the force F1 = 249 N acts at an angle of θ1 = 90° (upwards) relative to the horizontal.
We also know that F2 and F3 act at angles of θ2 = 26° and θ3 = 28° (arccos(5/3)) respectively, relative to the horizontal.
We can represent the forces F1, F2 and F3 using their horizontal and vertical components, using the following relationships:
F1x = F1 * cos(90) = 0 N
F1y = F1 * sin(90) = 249 N
F2x = F2 * cos(θ2)
F2y = F2 * sin(θ2)
F3x = F3 * cos(θ3)
F3y = F3 * sin(θ3)
the horizontal and vertical components of the resultant force, R, are the sum of the horizontal and vertical components of the individual forces.
Rx = F1x + F2x + F3x = F2 * cos(θ2) + F3 * cos(θ3)
Ry = F1y + F2y + F3y = F2 * sin(θ2) + F3 * sin(θ3) + 249 N
We know that the magnitude of the resultant force, R, is equal to 373.15 N and it is pointing upward (Ry direction)
R = sqrt(Rx^2 + Ry^2) = 373.15 N
Rx = 0 N (horizontal component is 0)
Ry = 373.15 N
From this equation and the fact that we know the value of F1y, we can find the value of F2y
F2y = Ry - F1y = 373.15 N - 249 N = 124.15 N
Using the equation of F2y = F2 * sin(θ2) we can find the value of F2
F2 = F2y / sin(θ2) = 124.15 N / sin(26) ≈ 220.87 N
So the force F2 that such that the resultant force is vertical with a magnitude of 373.15 N is 220.87 N.
It's worth to note that since the horizontal component of the resultant force (Rx) is 0, we don't know the value of F3 and it's not possible to find it.
A 3.2 microF capacitor has a potential difference of 21.0 V between its plates. How much additional charge flows into the capacitor if the potential difference is increased to 47.0 V?
Please explain well and with in depth steps for me to understand. I dont understand this chapter
An additional 83.2 micro C of charge will flow into the capacitor.
A 3.2 micro F capacitor has a potential difference of 21.0 V between its plates. An additional 83.2 micro C of charge will flow into the capacitor. The formula for the charge Q on a capacitor with capacitance C that is connected to a voltage V is given by:
Q = CV
where C is the capacitance of the capacitor in Farads, V is the potential difference across the capacitor in volts, and Q is the charge on the capacitor in coulombs. Thus, if the potential difference across the capacitor is increased from 21.0 V to 47.0 V, an additional 83.2 micro C of charge will flow into the capacitor. Capacitor is the entity that used to store the electricity in it, it is also used to generate an electricity spark in the gap between the wires of the circuit and the project just to make an gap and it is used to jump an electricity phase like wise in any circuit, it is used to provide the power and potential to make the charge jump from one place to another.
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An additional 83.2 microC of charge will flow into the capacitor.
The formula for the charge Q on a capacitor with capacitance C that is connected to a voltage V is given by:
Q = CV
where C is the capacitance of the capacitor in Farads,
V is the potential difference across the capacitor in volts, and Q is the charge on the capacitor in coulombs.
The initial charge on the capacitor is given by:Q1 = C1V1 = (3.2 microF)(21.0 V) = 67.2 microC
The final charge on the capacitor when the potential difference is increased to 47.0 V is given by:
Q2 = C2V2 = (3.2 microF)(47.0 V) = 150.4 microC
The additional charge that flows into the capacitor is equal to the difference between the final and initial charges:
ΔQ = Q2 - Q1 = 150.4 microC - 67.2 microC = 83.2 microC
Thus, if the potential difference across the capacitor is increased from 21.0 V to 47.0 V, an additional 83.2 microC of charge will flow into the capacitor.
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38. Which of the following is true about all or non-rule?
A) Can be applied on whole heart.
B) Minimal stimulus produces minimal response.
C) A minimal stimulus produces a maximal response.
D) The nerve trunk either responc maximally or not respond at all.
E) The response in a single nerve fiber increases with increase intensity of
stimulus.
The nerve trunk either response maximally or not respond at all. - this is true about all or non-rule. Option (D) is correct.
What is all-or-non law?
The all-or-none law in physiology states that a single nerve fiber will always respond maximally to stimulation and generate an electrical impulse with a single amplitude.
The height of the impulse will remain constant even if the stimulus's intensity or duration are raised. The nerve fiber either responds fully or not at all.
Thus, either the nerve trunk responds fully or not at all.
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How much work is done in accelerating a 2000 kg car from rest to a speed of 30 m/s?
Total work done is 900KJ.
Work is the product of the component of the force in the direction of the displacement and the magnitude of this displacement.Work and energy are closely related to each other. Work can also be defined as the transfer of energy. In Physics, for two objects, the work done is defined as the transfer of energy from the first object to the second object. Also, energy is defined as the capacity to do work.Work Energy Principle: The change in kinetic energy of a body is equivalent to the net work done on the body.Here, Kinetic energy of car at rest is 0.
When it accelerates from rest to a speed of 30 m/s, it's kinetic energy is :
K.E = 1/2mv^2
Given, m = 2000Kg and v = 30 m/s
Putting these values in above equation, we get: K.E = 900000J = 900 KJ
We know that Work done is change in Kinetic energy.
So, W = 900KJ
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A velocity vs. time graph is shown.
What is the acceleration of the object?
• 0m/s2
• 0.25m/s2
• 4 m/s2
• 8 m/s2
Answer:
4 m/s² is the answer..
Explanation:
acceleration=change in velocity / change in. time
question 1 - A certain type of glass is used in making flat-panel computer monitors. For light with a wavelength in air of 656.3 nm, the refractive index of the glass is nA = 1.5160. For light with a wavelength in air of 435.8 nm, nB = 1.5290. Determine the difference, lA - lB, in their wavelengths inside the glass.
The difference in the wavelength of the lights in the glass is 147.88 nm.
What is the difference in their wavelengths inside the glass?The difference in their wavelengths inside the glass is calculated by applying the following formula as shown below.
The wavelength of light A inside the glass is calculated as;
nA = ( 656.3 nm ) / ( 1.516 )
nA = 432.9 nm
The wavelength of light B inside the glass is calculated as;
nB = ( 435.8 nm ) / ( 1.529 )
nB = 285.02 nm
difference in wavelength = 432.9 nm - 285.02 nm = 147.88 nm
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6. A 1.0-kg ball on the end of a string is whirled at a constant speed of 2.0 m/s in a
horizontal circle of radius 1.5 m. What is the work done by the centripetal force
during one revolution?
The work done by the centripetal force during one revolution is 25.12 J.
What is workdone?Work is said to be done when ever a force moves moves a body through a certain distance.
To calculate the workdone by the centripetal force during one revolution, we use the formula below.
Formula:
W = (mv²/r)2πr........................ Equation 1Where:
W = Work done by the centripetal force during one revolutionr = Radius of the circlev = Speed of the ball around the circlem = Mass of the ballFrom the question,
Given:
m = 1 kgv = 2 m/sr = 1.5 m/sπ = 3.14Substitute these values into equation 1
W = (1×2²/1.5)×2×3.14×1.5W = 25.12 JHence, the work done is 25.12 J.
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5. Why must all of the experimental horizontal travel distances of the steel spheres necessarily be less than the potential, theoretical travel distance?
All of the experimental horizontal travel distances of the steel spheres necessarily be less than the potential, theoretical travel distance because some of the energy losses ( due to friction, heat, sound) can not be calculated,
What is experimental value?In scientific experiments, the idea of experimental value is crucial. The measurements made during an experimental run make up the experimental value. A precise and exact result is desired while taking measurements for an experiment.
Precision refers to how closely the values of the measurements are to one another, whereas accuracy refers to how near a measurement is to its real theoretical value.
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5.1 5.2 5.3 QUESTION 5 (Start on a new page.) A skier of mass 60 kg skies from rest down a slope inclined at an angle of 15°. The length of the incline is 75 in. He reaches the end of the clined at a velocity of 15 m-s¹. A constant frictional force acts on the skier on his way down. 15:... 75 m Write down an expression for the magnitude of the normal force acting on the skier and then calculate its magnitude. Draw a labelled free-body diagram showing ALL the forces acting on the skier as he skies down the slope. Calculate the average frictional force acting on the skier during his motion down the incline. (2) (3) (7) [12]
The frictional force that is acting on the object is 91N
What is a free body diagram?The normal force can be obtained from the equation mgcosθ. The magnitude of the normal force is;
F = 60 * 9.8 * cos 15
F = 568 N
To obtain the moving force, we must get the acceleration from;
v^2 = u^2 - 2as
Since v = 0
u^2 = 2as
a = u^2/as
a = (15)^2/2 * 75
a = 1.5 m/s^2
Then F = ma
F = 60 * 1.5 = 90 N
The coefficient of friction is 90 N/568N
= 0.16
Frictional force = μmgcosθ
Frictional force = 0.16 * 568
= 91 N
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During the year, a worker receives 14 my externally from uniform, whole-body gamina radiation. In addition, he receives estimated 50-y "committed doses of 80 my from interally deposited alpha particles in the lung and 180 mGy from beta particles in the thyroid (a) What is the effective dose for this worker? (b) How much additional external, uniform, whole-body gamma dose could he receive during the year without technically exceeding the NCRP/ICRP annual limit?
The annual limit of the NCRP/ICRP might technically be exceeded by an extra 40 mGy of external, uniform, whole-body gamma exposure during the year.
Doses of radiation in subsequent CT scans?Depending on the type of scan, the body part being studied, and the precise imaging parameters being employed, the radiation dose from a CT scan can vary greatly. The radiation exposure from following CT scans might be very low (for paediatric CT investigations, for example) or quite high (e.g., for CT angiography).
The cumulative radiation exposure from numerous CT scans on the same patient may result in a larger radiation dosage than from a single scan. As a result, it's crucial to consult a healthcare professional about the necessity of repeat CT scans and to utilize the least amount of radiation necessary to produce images with diagnostic quality.
270 mgy is the effective dose (1.15 x 244 mGy)
The effective dosage yearly limit set by NCRP/ICRP is 1 mSv (1000 mGy). The annual limit can potentially be exceeded, but the worker can still receive an additional 730 mGy of external, uniform, whole-body gamma radiation.
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