Answer:
three 3
Explanation:
What is the "price" that you pay for using less force?
What is the “price” that you pay for using less force? The price that you pay for using less force is having to do more work.
.....................................
dont ask this is what i looked up and found
The "price" that you pay for using less force is:
The object would not moveForce is defined as the energy which is required to move or change the velocity of an object.
There are different types of force which includes:
Gravitational forceApplied forceFrictional force, etcAs a result of this, if there is less force exerted on an object, then the "price" which would be paid for this is that the object would not move.
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I am giving 18 points. Please try and don’t just do it for the points.
They won’t let me shown the very last picture, it looks like the normal L shape that is in every picture, and just one straight line. L—
Like that.
Which of the following graphs below represents the motion of an object at variable speeds? (3 points)
Distance
(miles)
Time
(hours)
Distance
(miles)
Time
(hours)
Answer:Distance.
Explanation:
The north pole of one bar magnet is near the south pole of another bar
magnet. What happens to the magnets?
O A. They repel each other.
B. They attract each other.
C. They twist away from each other.
O D. They neither attract nor repel each other.
Answer: they attract each other .
Explanation: jus took it.
Can yall help me please?? I can't get it wrong!
Answer:
The answer should be C
Explanation:
2. Two projectiles thrown from the same point at angles 0,=60° and 02=30° with the horizontal,
attain the same height. What is the ratio of their initial velocities (Voi:Voz)?
Answer:
The answer is below
Explanation:
The maximum height (h) of a projectile with an initial velocity of u, acceleration due to gravity g and at an angle θ with the horizontal is given as:
[tex]h=\frac{u^2sin^2\theta}{2g}[/tex]
Given that the two projectile has the same height.
[tex]For\ the\ first\ projectile\ with\ an\ angle\ \60^0 \ with\ the\ horizontal\ and initial\ velocity\ u_1:\\\\h=\frac{u_1^2sin^260}{2g} =\frac{0.75u_1^2}{2g} \\\\For\ the\ second\ projectile\ with\ an\ angle\ \30 \ with\ the\ horizontal\ and initial\ velocity\ u_2:\\\\h=\frac{u_2^2sin^230}{2g} =\frac{0.25u_2^2}{2g}\\\\\frac{0.25u_2^2}{2g}=\frac{0.75u_1^2}{2g}\\\\0.25u_2^2=0.75u_1^2\\\\\frac{u_1^2}{u_2^2} =\frac{0.25}{0.75} \\\\\frac{u_1^2}{u_2^2}=\frac{1}{3} \\[/tex][tex]\\\frac{u_1}{u_2}=\sqrt\frac{1}{3}[/tex]
4. An 85 kg object has 2.16 x 10 J of kinetic energy. What is the object's velocity?
Answer:
v = 0.713[m/s]
Explanation:
Kinetic energy is defined as the product of mass by the squared velocity of a body. In this way with the following expression we can have the kinetic energy as a function of velocity.
[tex]E_{kin}=0.5*m*v^{2}[/tex]
where:
m = mass = 85 [kg]
v = velocity [m/s]
Ekin = kinetic energy = 2.16*10 [J]
[tex]2.16*10 = 0.5*85*v^{2}\\v =\sqrt{0.508} \\v= 0.713[m/s][/tex]
Practice Problem • In 2.5 s a car increases its speed from 60 km/h to 65 km/h while a bicycle goes from rest to 5 km/h.
•Which undergoes the greater acceleration?
• What is the acceleration of each vehicle?
Answer:
they have same acceleration 2m/s^2
Explanation:
a =v-u/t
65-60/2.5
2m/s^2
a) The acceleration of the car and the bicycle are equal since [tex]\delta V[/tex] for both vehicle is 5km/h and the time taken for both vehicle is also the same 2.5s.
b) The acceleration of the bicycle is 0.556m/s²
Given the data in the question;
Time taken for both car and bicycle; [tex]t = 2.5s[/tex]Initial velocity of car; [tex]u_c = 60km/h = 16.667m/s[/tex]Final velocity of car; [tex]v_c = 65km/h = 18.0556m/s[/tex]Since the bicycle starts from rest
Initial velocity of the bicycle; [tex]u_b = 0[/tex]Final velocity of the bicycle; [tex]v_b = 5km/h = 1.38889m/s[/tex]a)
The acceleration of the car and the bicycle are equal since [tex]\delta V[/tex] for both vehicle is 5km/h time taken for both vehicle is also the same 2.5s.
b)
The acceleration of each vehicle
To determine the acceleration for car and the bicycle, we use the first equation of motion:
[tex]v = u + at[/tex]
Where v is the final velocity, u is the initial velocity, a is the acceleration and t is the time.
Now, For the car;
[tex]18.0556m/s = 16.667m/s + ( a + 2.5s )\\\\a = \frac{18.0556m/s - 16.667m/s }{2.5} \\\\a = \frac{1.3886m/s}{2.5s} \\\\a = 0.556 m/s^2[/tex]
Hence, the acceleration of the car is 0.556m/s²
For the bicycle;
[tex]1.38889m/s = 0 + ( a * 2.5s )\\\\a = \frac{1.38889m/s}{2.5s}\\\\a = 0.556m/s[/tex]
Hence, the acceleration of the bicycle is 0.556m/s²
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Sheila lives in the seashore community of Beachview. At 6:00 a.M. One morning, she noticed that the local ocean water was at high tide. At approximately noon that same day, she noticed the water was at low tide.
Answer:
hello your question is incomplete below is the complete question
Sheila lives in the seashore community of Beachview. At 6:00 a.m. one morning, she noticed that the local ocean water was at high tide. At approximately noon that same day, she noticed the water was at low tide.
Which of the following describes what caused the change in tides between 6:00 a.m. and noon that day
options :
A)The Earth revolved approximately 90° around the Sun, and the gravitational attraction between the Moon and Sun increased.
B)The Earth completed one full rotation (360°), and the gravitational attraction between the Moon and the Beachview area increased.
C)The Earth completed one full revolution around the Sun (360°), and the gravitational attraction between the Moon and Sun decreased.
D)The Earth rotated approximately 90°, and the gravitational attraction between the Moon and the Beachview area decreased.
answer :
The Earth rotated approximately 90°, and the gravitational attraction between the Moon and the Beachview area decreased. ( D )
Explanation:
The movement of the Earth in the Galaxy occurs in two ways
namely: Rotation and Revolution and each movement comes has an effect on the earth, also each movement has a time frame as well.
The complete rotation of the earth about its axis takes about 24 hours and this rotation brings about Night and day and it also causes the rise and fall of tides. while the Revolution of the earth round brings about different seasons and it takes about 365 days for a complete revolution of the earth round the sun.
hence the the change in tides between 6:00 a.m. and noon that day is caused by The Earth rotating approximately 90°, and the gravitational attraction between the Moon and the Beachview area decreased.
77. Two blocks, with masses m1 = 400 g and m2 = 600 g, are connected by a string and lie on a frictionless tabletop. A force F = 3.5 N is applied to block m2. Find the acceleration of each object.
Answer:
See the answers below. And the free body diagrams attached.
Explanation:
To solve this problem, we must build a free body diagram, where we show the forces acting on a body, first for the m2 body, where the force of 3.5 [N] acts to the right. In such a way that a reaction force is presented in the opposite direction due to the string tied between both bodies, we will call this force T1.
Now using Newton's second law, which is defined as the sum of forces equal to the product of mass by acceleration, we can determine an equation as a function of T1.
∑F = m*a
[tex]3.5 -T_{1}=0.6*a_{2}[/tex]
We have an equation with two unknowns, in such a way we must perform a second free body diagram for the body with mass m1, to acquire the additional equation.
∑F =m₁*a₁
[tex]T_{1}=0.4*a_{1}[/tex]
By kinematics we know that if the string tied to Body 2 moves a distance, the part of the string at the end tied to body 1 will move the same distance. This same analysis is valid for velocities and accelerations.
This is the accelerations a1 and a2 are equal. Now equalizing both equations.
[tex]3.5-0.4*a_{1}=0.6*a_{2}\\but\\a_{1}=a_{2}\\3.5-0.4*a_{1}=0.6*a_{1}\\a_{1}=3.5[m/s^{2} ][/tex]
The acceleration of each block connected by the given string is 3.5 m/s².
The given parameters;
mass of the first block, m1 = 400 g = 0.4 kgmass of the second block, m2 = 600 g = 0.6 kgapplied force, F = 3.5 NThe net force on the blocks is calculated as follows;
[tex]\Sigma F = ma\\\\F - T = m_2a\\\\F - m_1(a -g)= m_2a\\\\g = 0 \ , \ in \ horizontal \ direction\\\\F - m_1a = m_2 a\\\\F = m_2 a + m_1 a\\\\F = a(m_1 + m_2)\\\\a = \frac{F}{m_1 + m_2} \\\\a = \frac{3.5 }{0.4 + 0.6} \\\\a = 3.5 \ m/s^2[/tex]
Thus, the acceleration of each block connected by the given string is 3.5 m/s².
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help its science
The average kinetic energy for atoms or molecules in a substance is called __________.
Group of answer choices
temperature
volume
heat
Most metals have...
a. Atoms that are spread out, and low specific heats
b. Atoms that are close, and low specific heats
c. Atoms that are spread out, and high specific heats
d. Atoms that are close, and high specific heats
6. What charge is in the nucleus?
a. negative charge
b. positive charge
C. no charge
d. positive and negative charges
A 150 lb person and a 200 lb person run into each other.
What can you say about force?
Who accelerated the most? Why?
Explanation:
1. Force is something that pushes or pulls you
2. The 150 lbs person accelerated faster because they had less force pushing or pulling them down.
Speed – time graph of uniform motion is horizontal straight line.
Select one:
a. TRUE
b. FALSE
answer please in comment what i am typing
Answer:
Hiiiiiiii........where r u frm??
How do you score a goal in team handball ?
Answer:a goal is scored by throwing the ball into the goal post and is confirmed by deciding that’s if the ball has hit the tape mark or not
Explanation:
What does it mean that photographs are two-dimensional?
What is the acceleration due to gravity near the earth’s surface?
Its value is 9.8 m/s2 on Earth. That is to say, the acceleration of gravity on the surface of the earth at sea level is 9.8 m/s2
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What is the acceleration of an object that has a mass of 10kg and is pushed with a force of 50n
Answer:
5m/s/s
Explanation:
force = mass x acceleration
50 = 10a
a=5m/s/s
In gym class, a student kicks a soccer ball high into the air. As the ball goes upward, which type of energy in increasing?
The answer is kinetic energy
Explation: it is moving
In gym class, a student kicks a soccer ball high into the air. As the ball goes upward, the gravitational potential energy gets increased.
What is Gravitational potential energy?
Gravitational potential energy can be defined as if the energy of an object possesses because of its position in a gravitational field.
The formula for gravitational potential energy is,
U = mgh
where,
U - Gravitational potential energy,
m - Mass,
g - gravitation field,
h - Height.
As we are on the Earth, the gravity acceleration can be as constant and the value is a = 9.8 m/s².
As a student kicks the ball, first it moves upward and its gravitational potential energy is increases and kinetic energy will completely begins to decrease but when the ball falls towards the earth, its gravitational potential energy will be transformed into kinetic energy. When the ball collides with the ground, the kinetic energy is transformed into other forms of energy.
The kinetic energy and gravitational potential energy changes during its movement from ground to the top height. Thus, when the ball goes upward gravitational potential energy gets increased.
Learn more about the energy,
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Which refers to the thermal energy that flows from one substance to another when the substances differ in
emperature?
Answer:
Heat
Explanation: The state in which no thermal energy transfer occurs because both substances are at the same temperature.
Answer:
A: Heat
I hope this helps
Why is a protective apron or lab coat important to use when working with acids?
Acids conduct electricity and contact could cause a shock.
Acids react with lipids and can cause damage to skin tissue.
Acids break down fabrics and can cause burns if the acids are strong.
Acids have a slippery feel and could result in a fall.
Answer:
Acids break down fabrics and can cause burns if the acids are strong.
Explanation:
A protective apron or lab coat is important when working with acids because acids break down fabrics and can cause burns if the acids are strong.
An acid is a substance that interacts with water to produce excess hydroxonium ions in an aqueous solution. A strong acid ionizes completely in solution. When they come in contact with a fabric, they break them down violently. So, if they come in contact with the skin, it causes a violent break down of body tissues. The apron acts a protective layer.Answer:
C
Explanation:
I got it right
If the sun were to collapse into a black hole, what would the radius be?
Answer:
If the Sun, with its mass of 1 MSun, were to become a black hole the Schwarzschild radius would be about 3 kilometers; thus, the entire black hole would be about one-third the size of a neutron star of that same mass
Answer:
It would be 1/3rd size of a neutron star
Explanation:
the Schwarzschild radius would be about 3 kilometers; thus, the entire black hole would be about one-third the size of a neutron star of that same mass.
is there any possibility to make 100% efficient system
Answer:
yes
Explanation:
its awesome
Which statement about the relationship between air pressure and air density is accurate?
A) Air pressure decreases as air density increases
B) Air pressure increases as air density increases
C) Air pressure increases as air density decreases
D) Air pressure is unrelated to air density
Answer:
A: Air pressure decreases as air density increases
Explanation:
Pressure is a force exerted on or against an object by being in contact with a substance. Thus, air pressure is due to the bombardment of the air (gas) particles with a surface. Density is defined as the mass per volume of a substance. Thus, air density is defined as the mass of air per unit volume.
If that Explanation does not make any sense let me make it easier.
The air at the top of a mountain is cooler than the air at the bottom. This temperature difference is due to a phenomenon that occurs in Earth’s atmosphere. Air rises and sinks based on differences in temperature and pressure. Here’s a quick experiment that will help explain the role of pressure.Take in a deep breath as if you were ready to blow out birthday candles. Puff your cheeks with air like a chipmunk. Hold it for a few seconds, and then blow the air slowly from your cheeks.Cold air sinks while warm air rises because cold air is denser than warm air. When a lot of cold air sinks, it creates an area of high air pressure where it hits the surface. This high-pressure air flows to an area of low pressure, creating wind. When this air warms, it rises up into the atmosphere.Temperature decreases as altitude increases. That’s why a mountain peak may be covered with snow while the bottom of the mountain is full of green plants and trees. When warm air rises into the atmosphere, it cools. The density of the air increases as it cools, which eventually creates an area of high pressure and starts the cycle again.
If not for this phenomenon of air rising and sinking in the atmosphere, there would be no wind or weather.
I hope that helped!
I need question 5 please and correct any others if they’re wrong
Sam is moving house and is carrying a 300N box of books up a flight of steps 5m high, it takes her 30 seconds. Gary follows her carrying a bag of clothes doing 1000 J of work; it only takes him 25 seconds. Who provides the biggest power? Show your working.
Answer: Sam provides the biggest power
Explanation: Power is defined, in Physics, as the rate of work done. Work is energy transferred to an object due to the force causing the displacement of the object.
So, to determine Power:
For Sam:
P = [tex]\frac{work}{time}[/tex]
[tex]P=\frac{F.d}{t}[/tex]
[tex]P=\frac{300.5}{30}[/tex]
P = 50 Watts
The unit for Power is [P] = J/s = Watt
For Gary:
P = [tex]\frac{work}{time}[/tex]
[tex]P=\frac{1000}{25}[/tex]
P = 40 Watts
Comparing power of Sam and Gary, we can conclude that Sam provides the biggest power of 50 Watts.
A dog starts at position x=2.50m, and undergoes a displacement of 8.25m. What is its final position?
Answer:
Civil law deals with behavior that constitutes an injury to an individual or other private party, such as a corporation. Examples are defamation (including libel and slander), breach of contract, negligence resulting in injury or death, and property damage.
Explanation:
What is the orbital period of a moon orbits around a 1.0*10^26 kg planet that has a is the orbit radius of 2.48 x 10^7?
Answer:
222334
Explanation:
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25)
Which example is NOT a part of the electromagnetic spectrum?
A)
microwaves
B)
radio waves
electricity
D)
purple light
Answer:
radio waves electricity
