Answer:
3.5 m/s
Explanation:
Speed = Distance / Time
= 70 m / 20 s
= 7 / 2 m/s
= 3.5 m/s
Which statement about local and global winds is true?.
Answer:
Global winds occur in belts around the globe.
Explanation:
This is because they blow over a limited area. They are influenced by local geography, such as nearness to an ocean.
When a person holds an object, it has potential energy. How will the potential energy change if the person lifts the object above his or her head?.
Answer:
The object's potential energy will be the same.
Explanation:
As long as the object hasn't been moved by itself, the potential energy will not change
Light with a wavelength of about 490 nm is made to pass through a diffraction grating. The angle formed between the path of the incident light and the diffracted light is 9. 2° and forms a first-order bright band. What is the number of lines per mm in the diffraction grating? Round your answer to the nearest whole number. Lines per mm.
A diffraction grating is a type of optical instrument obtained with a continuous pattern. The number of lines per mm in the diffraction grating is 326.
What is diffraction grating?A diffraction grating is a type of optical instrument obtained with a continuous pattern. The pattern of the diffracted light by a grating depends on the structure and number of elements present.
The given data in the problem is
[tex]\theta[/tex] is the angle formed between the path of the incident light and the diffracted light = 9. 2°
λ is the wavelength of the light=490nm=4.9
N is the number of lines per mm in the diffraction grating=?
n is ordered = 1
The formula for diffraction grating will be
[tex]\rm n\lambda=dsin\theta\\\\ \rm d=\frac {n \lambda}{sin\theta} \\\\ \rm d=\frac {1\times4.90\times10^{-7}}{sin9.2^0} \\\\\rm d=3.06\times10^{-6}m=3.06\times10^{-3}mm[/tex]
The number of lines per mm is the inverse of the distance between grating in mm.
[tex]\rm N=\frac{1}{d}[/tex]
[tex]\rm N=\frac{1}{3.06\times10^-3}\\\\\rm N=326.8/mm[/tex]
Hence the number of lines per mm in the diffraction grating is 326.
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Answer:
326
Explanation:
Two satellites are in circular orbits around Earth. Satellite A has speed vA. Satellite B has an orbital radius nine times that of satellite A. What is the speed of satellite B
Answer:
option B
Explanation:
given,
Satellite B has an orbital radius nine times that of satellite A.
R' = 9 R
now, orbital velocity of the satellite A
........(1)
now, orbital velocity of satellite B
from equation 1
hence, the correct answer is option B
explain the ways of producing charges
Answer:
By friction,by contact,by Electrostatic induction
Explanation:
By friction:This is the process whereby electric charges are produced when two surfaces move over another
By Contact :This is when energy is produced when two bodies come in contact with each other
By electrostatic induction: When a charged object is brought closer to another object (not touched), the original object doesn't lose any charge and the other object gets charged.
hope this helps
In a rocket-propulsion problem the mass is variable. Another such problem is a raindrop falling through a cloud of small water droplets. Some of these small droplets adhere to the raindrop, thereby increasing its mass as it falls. The force on the raindrop is
Fext=dpdt=mdvdt+vdmdt
Suppose the mass of the raindrop depends on the distance x that it has fallen. Then m=kx, wherek is a constant, and dm/dt=kv. This gives, since Fext=mg,
mg=mdvdt+v(kv)
Or, dividing by k,
xg=xdvdt+v2
This is a differential equation that has a solution of the form v=at, where a is the acceleration and is constant. Take the initial velocity of the raindrop to be zero.
A) Using the proposed solution for v, find the acceleration a.
B) Find the distance the raindrop has fallen in t = 2.00s.
C) Given that k = 2.00g/m, find the mass of the raindrop at t = 2.00s.
Answer:
a) a = g / 3
b) x (3.0) = 14.7 m
c) m (3.0) = 29.4 g
Explanation:
Given:-
- The following differential equation for (x) the distance a rain drop has fallen has the form:
- Where, v = Speed of the raindrop
- Proposed solution to given ODE:
v = a*t
Where, a = acceleration of raindrop
Find:-
(a) Using the proposed solution for v find the acceleration a.
(b) Find the distance the raindrop has fallen in t = 3.00 s.
(c) Given that k = 2.00 g/m, find the mass of the raindrop at t = 3.00 s.
Solution:-
- We know that acceleration (a) is the first derivative of velocity (v):
a = dv / dt ... Eq 1
- Similarly, we know that velocity (v) is the first derivative of displacement (x):
v = dx / dt , v = a*t ... proposed solution (Eq 2)
v .dt = dx = a*t . dt
- integrate both sides:
∫a*t . dt = ∫dt
x = 0.5*a*t^2 ... Eq 3
- Substitute Eq1 , 2 , 3 into the given ODE:
0.5*a*t^2*g = 0.5*a^2 t^2 + a^2 t^2
= 1.5 a^2 t^2
a = g / 3
- Using the acceleration of raindrop (a) and t = 3.00 second and plug into Eq 3:
x (t) = 0.5*a*t^2
x (t = 3.0) = 0.5*9.81*3^2 / 3
x (3.0) = 14.7 m
- Using the relation of mass given, and k = 2.00 g/m, determine the mass of raindrop at time t = 3.0 s:
m (t) = k*x (t)
m (3.0) = 2.00*x(3.0)
m (3.0) = 2.00*14.7
m (3.0) = 29.4 g
a stone is thrown at 45 degree with velocity 10m/sec.calculate the range of projectile
Answer:
As per Given Information
Angle on which the stone thrown ,theta = 45°
Velocity ,u = 10m/s
Acceleration due to gravity ,g is 10m/s²
We have to find the "Range of Projectile "
Range of projectile is denoted by R .
Using Formulae
[tex]\\ \bigstar{\boxed{\pink{\bf{R = \frac{ {u}^{2}sin2 \theta }{g} }}}} \\ \\ [/tex]
On putting the value we get
[tex] \sf\dashrightarrow \: R\: = \frac{ {10}^{2} \times sin(2 \times 45) }{10} \\ \\ \sf\dashrightarrow \: R = \frac{100 \times sin90 {}^{ \circ} } {10} \\ \\ \sf\dashrightarrow \: R \: = \frac{100 \times 1}{10} \\ \\ \sf\dashrightarrow \: R \: = \frac{100}{10} \\ \\ \sf\dashrightarrow \: R = \cancel \frac{100}{10} \\ \\ \sf\dashrightarrow \: R = 10m[/tex]
So, the range of projectile is 10m.
If a motionless table has a weight of 50 newtons, what is the value of the normal force acting on the table?
A. 0 N
B. 50 N
C. 100 N
D. This cannot be determined
Answer:
d
Explanation:
because it also depends upon accleration acting upon it
Select the correct answer.
How do we define energy efficiency?
A.
the ratio of the actual output energy to the input energy
B.
the ratio of power gain to power loss
c.
the product of input power and output power
D.
the sumy potential and kinetic energy
What is the value of a charge that has an electric potential of 325 V and an electric potential energy of 0. 025 J? 7. 7 × 10-4 C 7. 7 × 10-5 C 1. 3 × 103 C 1. 3 × 104 C.
Electric potential is the amount of work needed to move a unit charge from a point to a specific point against an electric field. Hence the value of a charge will be 7.7 ×10⁻⁵.
What is electric potential energy?Electric potential is the amount of work needed to move a unit charge from a point to a specific point against an electric field.
However, the electric potential energy of a charge is given by
E=qV
q is the charge
V is the electric potential
E is the electric potential energy
The electric charge value if found by dividing the electric potential energy with the electric potential
[tex]\rm q= \frac{E}{V} \\\\ \rm q= \frac{0.025}{325} \\\\\rm q= 7.7\times 10^{-5} \;C[/tex]
Hence the value of a charge will be 7.7 ×10⁻⁵.
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Shondra takes notes in class. I. Electromagnetic Waves II. The ability to work - Has many forms - Mechanical III. Potential energy - Chemical - Elastic - Gravitational Kinetic energy - Energy of movement - Electrical IV. Nuclear - Radiant - Thermal One line of Shondra’s notes is irrelevant to the rest of her notes. Which line is about a different topic than the rest of Shondra’s notes? I II III IV.
The waves that are related to both electricity and magnetism are known as (EM) waves .electromagnetic Waves' this line is about a different topic than the rest of Shondra’s notes.
What is an electromagnetic wave?The waves that are related to both electricity and magnetism are known as electromagnetic (EM) waves. These waves are made up of time-varying electric and magnetic fields that travel over space.
These waves, which are related to electricity and magnetism, would undoubtedly spread in space. The waves that are related to both electricity and magnetism are known as electromagnetic (EM) waves.
These waves are made up of time-varying electric and magnetic fields that travel over space. These waves, which are related to electricity and magnetism, would undoubtedly spread in space.
Hence option 1 is right because the 'Electromagnetic Waves' these line is about a different topic than the rest of Shondra’s notes.
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How are velocity and acceleration related
Answer:
Acceleration is the rate of change of velocity. If an object is changing its velocity, its speed, or changing its direction, then it is said to be accelerating.
Explanation:
when you change directions or speed up you are accelerating (or decelerating) and when you change directions or speed its called velocity.
Describing Simple Machines
Match each simple machine with its description.
lever
is a ramp
inclined plane
+
similar to a seesaw, can lift an object
pulley
uses a rope; can change the direction
of a force
wheel and axle
reduces the amount of friction when
an object is being moved
wedge
t
can split apart an object
Answer:
A wedge can split an object apart
A lever is the seesaw
inclined plane is a ramp
a pulley can reduce the amount of friction
wheel and axle is the rope one
Explanation:
Following are the matches:
lever: similar to a seesaw, can lift an objectinclined plane: is a ramppulley: uses a rope; can change the direction of a forcewheel and axle: reduces the amount of friction when an object is being movedwedge: can split apart an objectWhat are simple machines?Simple machines are basic mechanical devices that can help make work easier by reducing the amount of force or effort needed to do a task. They are usually the most basic forms of machines, often made up of only one or two parts, and are used to change the direction or magnitude of a force.
There are six types of simple machines:
Lever: A rigid bar that pivots around a fixed point, called a fulcrum, to move a load. Examples include a seesaw, crowbar, and scissors.Inclined Plane: A sloping surface used to move a load from a lower level to a higher level. Examples include a ramp and stairs.Pulley: A wheel with a grooved rim used to change the direction or magnitude of a force by pulling a rope or cable. Examples include a crane and a flagpole.Wheel and Axle: A wheel with a rod or axle at its center used to move a load. Examples include a car wheel and a doorknob.Wedge: A triangular-shaped tool that can split or separate objects. Examples include a knife and an ax.Screw: An inclined plane wrapped around a cylinder or cone used to hold objects together or to lift or move them. Examples include a bolt and a jar lid.Simple machines are the building blocks for more complex machines, and they are used in many everyday devices and equipment to make work easier and more efficient.
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A rolling ball has 18 joules of kinetic energy and is rolling 3 m/s. Find its
mass
Answer:
The mass of a rolling ball with kinetic energy of 18 joules and velocity of 3m/s is 4kg.
Explanation:
HOW TO CALCULATE MASS?
The mass of a moving object can be calculated by using the following expression:
K.E = ½ mv²
Where;
K.E = kinetic energy (Joules)
m = mass (kg)
v = velocity (m/s)
According to this question, rolling ball has 18 joules of kinetic energy and is rolling at 3m/s. The mass is calculated as follows:
18 = ½ × m × 3²
18 = ½ × 9m
36 = 9m
m = 4kg
Therefore, the mass of a rolling ball with kinetic energy of 18 joules and velocity of 3m/s is 4kg.
If there is a new moon today, in how many days will the next full moon occur?.
A car travelling at a speed of 45 m/h takes 20 minutes to reach its destination. What distance has the car travelled.
Answer:
A car travelling at a speed of 45 m/h takes 20 minutes to reach its destination.
We have to find the distance travelled by the car .
Changing the unit of time into hour
Time = 20/60 hour
Time = 2/3 hour
Now, let's calculate the distance travelled by the car .
[tex] \bf \: Distance \: travelled \: = Speed \: \times Time[/tex]
Put the value we get
[tex] \sf \dashrightarrow \ \: Distance \: travelled \: = 45 \times \frac{2}{3} \\ \\ \sf \dashrightarrow \ \: Distance \: travelled \: = \cancel{45} \: \times \frac{2}{ \cancel3} \\ \\ \sf \dashrightarrow \ \: Distance \: travelled \: = 15 \times 2 \\ \\ \sf \dashrightarrow \ \: Distance \: travelled \: = 30km \: [/tex]
So, the distance travelled by the car is 30Km .
The car has travelled a distance of 15 m
Distance travelled by carSince distance, d = vt where
v = speed and t = time.Now, the car travels at a speed of 45 m/h in 20 minutes.
So,
v = 45 m/h = 45 m/h × 1 h/60 min = 0.75 m/min and t = 20 minSince d = vt,
substituting the values of the variables into the equation, we have
d = vt
d = 0.75 m/min × 20 min
d = 15 m
So, the car has travelled a distance of 15 m
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The gravitational force between a satellite and Earth’s moon is 324 N. The mass of the moon is 7. 3 × 1022 kg. If the distance from the moon to the satellite is 2. 6 × 106 m, what is the mass of the satellite? 1. 7 × 10–4 kg 2. 2 × 10–3 kg 230 kg 450 kg.
The gravitational force is s type of force that has the ability to attract any two objects with mass. The mass of the satellite will be 450 kg.
What is the gravitational force?The gravitational force is s type of force that has the ability to attract any two objects with mass. Gravitational force tries to pull two masses towards each other.
The given data in the problem is;
F is the gravitational force = 324 N,
m₁ is the mass of the moon = 7.3 * 10²²kg
r is the distance between the moon and satellite = 2.6 * 10 ⁶m.
m₂ is the mass of satelite =?
G is the gravitational constant = 6.67×10⁻¹¹
The gravitational force is given by
[tex]\rm F= \frac{Gm_1m_2}{r^2} \\\\ \rm m_2 = \frac{Fr^2}{Gm_1} \\\\ \rm m_2 = \frac{324 \times (2.6\times 10^6)^2}{6.67\times 10^{-11} \times 7.3 \times 10^22 } \\\\ \rm m_2= 450 kg[/tex]
Hence the mass of the satellite will be 450 kg.
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Determine the horizontal displacement of a projectile if it has a flight time of 8 seconds and a horizontal velocity of 14 m/s
[tex]\\ \rm\bull\rightarrowtail Displacement=Velocity\times Time[/tex]
[tex]\\ \rm\bull\rightarrowtail Displacement=8(14)[/tex]
[tex]\\ \rm\bull\rightarrowtail Displacement =112m[/tex]
i need helpp pls!!!!??????
Answer:
too hard bro others will answer it
Explanation:
sry
when is homeostasis important
Answer:
Homeostasis maintains optimal conditions for enzyme action throughout the body, as well as all cell functions. It is the maintenance of a constant internal environment despite changes in internal and external conditions.
Define the LAWS OF PHYSICS. State it out in full.
BRAINLIEST WILL BE GIVEN!!!!!!
Answer:
The laws of thermodynamics define a group of physical quantities, such as temperature, energy, and entropy, that characterize thermodynamic systems in thermodynamic equilibrium.
pls help me with this
Answer:
needle -attract
wooden spoon -repel
nails -attract
safety pins -attract
paper -repel
Explanation:
It is commonplace to find statements on food cans such as “Net Weight: 16 oz. (454g)” Why do most people find this acceptable?
People find this acceptable because it is common to use mass and weight as synonyms even if they are not.
What is the difference between mass and weight?In physics, mass refers to the amount of matter, due to this, mass is often measured in:
GramsKilosTonsAmong others.On the other hand, weight considers gravity or the force gravity exerts on an object, and due to this it is measured in newtons.
Why do people find the statement “Net Weight: 16 oz. (454g)” acceptable?Even if weight and mass are different, people often use the word "weight" to refer to the mass, that is why statements such as the above are acceptable. However, if you are a physicist this would be incorrect.
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2. A 6 kg object is initially at rest. A 300 N force acts on the object, moving it forward 4 meters in
2 seconds.
a) How much work does the force do on the object?
b) How much power is exerted on the object?
c) What is the final velocity of the object?
Answer: a. 1200J b. 600W c. 20m/s
Explanation: W = Fxcos
F = 300, x=4, direction of force is = to direction of object so cos(0) = 1
a) 300*4 = 1200
b) P = W/t
1200/2 = 600W
c) vf^2 = vi^2 + 2ax
vi = 0, x = 4, a= 300/6
vf^2 = 2(50)(4)
vf^2 = 400
vf= 20m/s
If two objects, like the eggs in the video, experience the same change in momentum but over time periods of
different lengths, how do the forces experienced by each object compare?
Explanation:
what is the force
ican't under stand these question
These two objects are experienced different forces and the object which experiences the same change in momentum but over a shorter period of time will experience more force than the other object.
To know more about the dependance of force on momentum and time, we need to know more about force and how it works.
What is force?Newton's second law says that the force is rate of change of momentum with resprct to time. What is the mathematical formulation of force?Mathematically, if ΔP = change in momentum and Δt = change in time, Force=ΔP/ΔtIf ΔP is constant, then force is inversly propertional to the change in time i.e. when change in time increases force decreases and vice versa.Thus, we can conclude that between these two objects, one, who experiences the same change in momentum for shorter period of time, will experience more force than other.
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A 0.50-kg red cart is moving rightward with a speed of 40 cm/s when it collides
with a 1.50-kg blue cart that is initially at rest. The two carts stick together and
move to the right with a speed of 10 cm/s after the collision,
Enter the momentum values of each individual cart and of the system of two
carts before and after the collision. Also indicate the change in momentum of the
carts and of the system,
The momentum of the red cart before the collision is 0.2 kgm/s and the blue cart is 0.
The momentum of the red cart after the collision is 0.05 kgm/s and the blue cart is 0.15 kgm/s.
The change in momentum of the system of the carts is 0.
Initial momentum of the carts before collisionThe momentum of the carts before the collision is calculated as follows;
P(red) = 0.5 kg x 0.4 m/s = 0.2 kgm/s
P(blue) = 1.5 x 0 = 0
Momentum of the carts after collisionThe momentum of the carts after the collision is calculated as follows;
P(red) = 0.5 x 0.1 = 0.05 kgm/s
P(blue) = 1.5 0.1 = 0.15 kgm/s
Change in momentum of the carts[tex]\Delta P = P_f - P_i[/tex]
ΔP = (0.05 + 0.15) - (0.2)
ΔP = 0
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A 70.0 kg astronaut is training for accelerations that he will experience upon reentry. He is placed in a centrifuge (r = 10.0 m) and spun at a constant angular velocity of 16.3 rpm. Answer the following:
What is the angular velocity of the centrifuge in ?
What is the linear velocity of the astronaut at the outer edge of the centrifuge?
What is the centripetal acceleration of the astronaut at the end of the centrifuge?
How many g’s does the astronaut experience?
What is the centripetal force and net torque experienced by the astronaut? Give magnitudes and directions.
Answer:
1.3823 rad/s
20.7345 m/s
28.66129935 m/s²
2006.29095 N radially outward
Explanation:
r = Radius = 15 m
m = Mass of person = 70 kg
g = Acceleration due to gravity = 9.81 m/s²
Angular velocity is given by
Angular velocity is 1.3823 rad/s
Linear velocity is given by
The linear velocity is 20.7345 m/s
Centripetal acceleration is given by
The centripetal acceleration is 28.66129935 m/s²
Acceleration in terms of g
Centripetal force is given by
The centripetal force is 2006.29095 N radially outward
The torque will be experienced when the centrifuge is speeding up of slowing down i.e., when it is accelerating and decelerating.
A compass needle normally points toward earth’s magnetic pole, which is near the north pole. Which best explains why the needle moves away from the pole when it comes close to a current-carrying wire?.
Answer:
Magnetism surrounding the wire draws the needle toward the wire.
Explanation:
The wire itself has it's own magnetism also, that's why, if you put a compass near it, then the compass will get confused and point the wrong direction.
Thanks!
MiniMeteorologist
What are the uses of a magnet?
Answer:
A magnet is used in a compass to show the direction.
Magnets are used in medical equipment.
Powerful magnets are used to lift objects
they are used in refrigerator, televisions, earphones etc
Answer:
1. they are used in medical equipment
2. they are used in dynamos
3. they are used in generators and motors
4. powerful magnets are used to lift heavy objects
5. they are used to prevent corrosion in a water heater
A container of orange juice holds 580 millimeters. How many liters is 580 millimeters?
Since 1 liter = ___ millimeters, divide 580 by ___. 580 ÷ ___ = ___. So, 580 millimeters = ___ liter. The container holds ___ liter of orange juice.
Answer:
1000
1000
1000
0.580
0.580
0.580
Explanation:
