Question

1. A box is at rest on a flat table. Which of the following is true?

a. The normal force and the gravitational force are equal in magnitude and opposite in direction.

b. The magnitude of normal force depends on the coefficient of static friction between the book and the table.

c. Gravity exerts a force on the box that depends on how big the normal or support force is.

d. The normal force and the gravitational force are an action-reaction pair.

2. The mass of a a satellite in geostationary orbit is 1838 kg. The mass of Earth is 5.97*1024 kg. Because of the force Earth exerts on the satellite, it accelerates. The magnitude of the acceleration is 0.223 m/s2, and it is directed towards Earth.

What is the magnitude of the force in N the satellite exerts on Earth?

3. A person weighing 766 N stands in an elevator that decelerates at a rate of 1.4 m/s2 while moving downward.

What is the magnitude of the force in N exerted on the person by the floor of the elevator while it is decelerating?

Use g = 9.8 m/s2.

4. A person weighing 898 N stands in an elevator that decelerates at a rate of 1.7 m/s2 while moving upward.

What is the magnitude of the force in N exerted on the person by the floor of the elevator while it is decelerating?

Use g = 9.8 m/s2.

Answer #1

Which of the following statements are IMPOSSIBLE? Choose
all that apply.
The moving motorcycle had 0 J of KE.The truck had 0 J of KE and
0 kg∙m/s of momentum.A ball moving in a circle had 325 N of net
force acting on it.A box had an acceleration of 0 m/s2
while a net force of 0 N acted on it.Jack exerted 125 N of force
due west on a cart. As a direct result, the cart exerted 125 N...

21. A unicorn running on a beach at 7 m/s changes speed at a
constant rate of 1.2 m/s2 over a period of 2 seconds.
What distance did the unicorn travel during this process?
22. In a fit, a toddler throws straight down his favorite 3 kg
toy with an initial velocity of 1.5 m/s. What is the magnitude of
the velocity in m/s of the toy when it strikes the ground 0.5
seconds later?
23. A 66-kg woman in...

The diagram below shows a box weighing 100 N being pushed across
a horizontal floor by a force of magnitude FA = 280 N.
Assume the surface to be frictionless. What is the magnitude of the
normal force exerted on the block by the floor?
Group of answer choices
280 N
100 N
240 N
9,800 N
380 N

49) A 2.0-kg box is pushed from rest by a person exerting a
constant force of 50 N. The person exerts this force
over a distance of 3.0 m before releasing the box and letting it
slide to a stop. The coefficient of kinetic friction between the
box and the floor is 0.15. (a) Draw a motion diagram showing the
motion of the box from the moment the person begins pushing to the
moment the box stops moving. (b) Represent...

Q1)At the surface of Jupiter's moon Io, the acceleration due to
gravity is 1.81 m/s2 . A watermelon has a weight of 47.0 N at the
surface of the earth. In this problem, use 9.81 m/s2 for the
acceleration due to gravity on earth.
a-What is its mass on the earth's surface?
b-What is its mass on the surface of Io?
c-What is its weight on the surface of Io?
----------------------------------------------------------------------
Q2)The upward normal force exerted by the floor is...

Calculate the magnitude of the normal force on a 12.7 kg block
in the following circumstances. (Enter your answers in N.)
(a)
The block is resting on a level surface.
N
(b)
The block is resting on a surface tilted up at a 25.8° angle
with respect to the horizontal.
N
(c)
The block is resting on the floor of an elevator that is
accelerating downward at 2.28 m/s2.
N
(d)
The block is on a level surface and a...

A 36.5 kg box initially at rest is pushed 4.25 m along a rough,
horizontal floor with a constant applied horizontal force of 150 N.
If the coefficient of friction between box and floor is 0.300, find
the following.
(a) the work done by the applied force
J
(b) the increase in internal energy in the box-floor system due to
friction
J
(c) the work done by the normal force
J
(d) the work done by the gravitational force
J...

Calculate the magnitude of the normal force on a 25.2 kg block
in the following circumstances. (Enter your answers in N.) HINT (a)
The block is resting on a level surface. 246.96 (b) The block is
resting on a surface tilted up at a 40.8° angle with respect to the
horizontal. 186.94 (c) The block is resting on the floor of an
elevator that is accelerating downward at 3.03 m/s2. (d) The block
is on a level surface and a...

18.
A 34.5 kg box initially at rest is pushed 5.75 m along a rough,
horizontal floor with a constant applied horizontal force of 150 N.
If the coefficient of friction between box and floor is 0.300, find
the following.
(a) the work done by the applied force
___J
(b) the increase in internal energy in the box-floor system due to
friction
___J
(c) the work done by the normal force
___J
(d) the work done by the gravitational force...

A box, initially at rest, is pulled by a rope as it slides along
a horizontal (level) carpeted floor in the positive direction;
there is friction. The mass of the box is 8 kg and the tension in
the rope has a magnitude of 40 N. After 4 seconds of pulling, the
box has a speed of 12 m/s.
1. While the box is being pulled:
a. what is the magnitude of acceleration of the box? Answer:
_________
b. what...

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