Question

14. Bob drags a box with a mass m=45kg up a ramp. The ramp makes an angle of 25◦ with the horizontal direction. Bob pulls the the box upwards at a constant velocity 5m/s by applying a force F~ whose direction makes angle of 30◦ with the ramp. The coefficient of kinetic friction between the ramp and the box µk = 0.2. Determine the magnitude of the force F~ .

Answer is F=275.7N

Answer #2

Let us consider that the angle made by the ramp with horizontal is

and the angle made by the force with ramp is

Following figure depicts the situation and the forces acting on the box. Frictional force will be acting opposite the direction of motion that means, downwards along with mgsin().

So, the Normal force acting on the rough surface is given by,

Where F is the force that is applied by the Bob.

Since the box is moving with uniform speed, the component of forces acting parallel to the direction of motion must be equal.

answered by: anonymous

A box of mass 14 kg sits at rest on a ramp that makes an angle
of 30 degrees with the horizontal. The coefficient of static
friction between the box and the ramp is 0.88. What is the
magnitude of the frictional force between the box and the ramp?

A 6.0-kg crate is pulled up a ramp by a 50-Newton force. The
ramp makes a 30o angle with the horizontal, and the coefficient of
kinetic friction between the crate and the ramp is 0.30.
a) Draw a free body diagram
b) What is the magnitude of the kinetic frictional force?
c) What is the acceleration of the crate?

A woman attempts to push a box of books that has mass m
up a ramp inclined at an angle α above the horizontal. The
coefficients of friction between the ramp and the box are
μs and μk. The force
F⃗ applied by the woman is
horizontal.
Assume that μs is less than this critical value. What
magnitude of force must the woman apply to keep the box moving up
the ramp at constant speed?

A 65.0 kg box is pushed up a ramp inclined at 27.0∘. The applied
force (F) is horizontal and causes the block to move at a constant
speed. Determine the magnitude of the applied force,
a. when the ramp is frictionless.
b. when the coefficient of kinetic friction is 0.200.

A box of mass m slides with an initial velocity of 3 m/s down a
1.2 meter long ramp which is inclined 20˝ from the horizontal. The
coefficient of kinetic friction between the ramp and box is
.45.
a) Determine the direction and magnitude of the acceleration of
the box as it slides down the incline - is it slowing down or
speeding up?
b) How much time does it take for the box to get to the end of...

a box slides down an 8 m long ramp from rest. the angle of the
ramp is at 30 degress relative to the horizontal, also the
coffiecient of kinetic friction between the box and the ramp is
0.2. how long will it take the box to reach the bottom of the
ramp?

A 26.0 kg box of textbooks rests on a loading ramp that makes an
angle α with the horizontal. The coefficient of kinetic
friction is 0.40, and the coefficient of static friction is
0.50.
(a) As the angle α is increased, find the minimum angle
at which the box starts to slip.
(b) At this angle, find the acceleration once the box has begun
to move.
(c) At this angle, how fast will the box be moving after it has...

A box with mass 1.74 kg is being pulled across a rough surface
at a constant speed with a coefficient of kinetic friction
µk = 0.366. The pulling force has a magnitude of 11.2 N
and is directed at an angle 32.8 degrees above horizontal. If the
box is dragged a distance of 10.3 m, what is the total energy lost
to friction? (Hint: be sure to account for the upward component of
the pulling force, and note that the...

Marsha is pushing down and to the right on a 21-kg box at an
angle of 30? below horizontal. The box slides at constant velocity
across a carpet whose coefficient of kinetic friction with the box
is 0.70.
Determine the magnitude of the force exerted by Marsha on the
box.
Determine the magnitude of the normal force exerted by the
surface on the box.
Determine the magnitude of the friction force exerted by the
surface on the box.

A box of mass m slides with an initial velocity of 3 m/s down a
1.2 meter long ramp which is inclined 20˝ from the horizontal. The
coefficient of kinetic friction between the ramp and box is
.45.
Question: How much time does it take for the box to get to the
end of the ramp?

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 8 minutes ago

asked 30 minutes ago

asked 34 minutes ago

asked 43 minutes ago

asked 45 minutes ago

asked 57 minutes ago

asked 57 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago