Question

20.0-kg block initially sits at rest on a rough horizontal floor. One end of a string is attached to the block. You pull on the other end of the string with a force of 40.0 N so that the string makes an angle of 30.0° with the horizontal. After pulling the block 3.00 m across the floor, it is traveling with a speed of 1.25 m/s. What is the magnitude of the force of kinetic friction exerted on the block by the floor?

Answer #1

A
5.00 kg block sits on the floor at rest. You pull on a rope upwards
at an angle. The coefficient of static friction is 0.400 and the
coefficient of kinetic friction is 0.300. When you pull upwards
with a force of 20.0 N at an angle of 35.0°, what is the force of
friction on the box? What is the acceleration of the box?

Question 1:
A 2-kg wood block is pulled by a string across a rough
horizontal floor. The string exerts a tension force of 30 N on the
block at an angle of 20º above the horizontal. The block moves at
constant speed. If the block is pulled for a distance of 3.0 m, how
much work is done by the tension force?
Question 2:
Part A: A spring-loaded toy gun is used to launch a 12.0-g
plastic ball. The spring...

A
7.00 kg block sits on the floor at rest. Block is being pulled
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degrees. What is the magnitude of block’s acceleration?

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...

Block B of 40.0 kg is sitting at a frictionless horizontal floor
at a height h1 = 40.0 m above the ground, when a second 100.0 kg
block (block A), moving at an unknown speed hits and sticks to
block B. After the collision, the combination slides down a hill
which has friction, with a speed of 2.00 m/s.
A. What was the speed of the block A before the collision?
B. At the end of the path, a very...

A 2.90 kg block on a horizontal floor is attached to a
horizontal spring that is initially compressed 0.0340 m . The
spring has force constant 850 N/m . The coefficient of kinetic
friction between the floor and the block is 0.42 . The block and
spring are released from rest and the block slides along the
floor.
Part A
What is the speed of the block when it has moved a distance of
0.0190 m from its initial position?...

A horizontal force of 60.0 N is applied to a 3.00 kg block as
the block slides a distance of 0.500 m up a ramp. The ramp is
inclined at an angle of 30.0◦ and the coefficient of kinetic
friction between the ramp and the block is 0.600. If the block is
initially at rest, how fast is it moving at the end of the
displacement? Please make answer very detailed

A block with mass 6.00 kg slides on a horizontal floor as it is
pulled with a string by a force of 50.0 N at an angle of 30.0° with
the horizontal.
The force of friction between the floor and the block is 10
N.
A. Draw below a free body diagram for the block. Label all the
forces and describe each force: name and source of the force.
B. Find the y-component of the net force. Explain your
answer....

A block with a mass of 12.0 kg is initially at rest at the top
of a plane that is inclined at an angle of 30.0° above the
horizontal. The block slides down the plane and is traveling with a
speed of 1.50 m/s when it reaches the bottom. If the plane is 0.750
m long, what is the coefficient of kinetic friction between the
block and the plane? please explain each step.

A 4.82 kg block located on a horizontal frictionless floor is
pulled by a cord that exerts a force F=12.4N at an angle
theta=25.0degrees above the horizontal, as shown. What is the
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applied?
What is the horizontal speed of the block 4.30 seconds after it
starts moving?
What is the magnitude of the normal force acting on the block
when the force F is acting on it?
If, instead,...

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