Question

1.
Two masses are connected by a string which goes over an ideal
pulley. Block A gas a mass of 3kg and the rough plane is inclined
30 degrees to the horizontal. The coefficients of friction between
block A and the plane are Us=0.4 and Uk=0.2. The system initially
at rest. If mass B increases gradually by addjng small masses on
the top, what is the minimum value of mass B needed for mass A to
start moving up?

2. A 10kg crate is pulled down a rough incline with a Force of
40N parallel to the inclined surface. the inclined surface makes an
angle of 20 degrees with the horizontal. The coefficient if kinetic
friction is 0.3 and the crate is pulled a distance of 8m. Calculate
the work done by the force, the work done by gravity on the crate,
the work done by the friction on the crate, and the work done by
the normal force.

Answer #1

A mass of 150g is suspended vertically from a string that runs
over a pulley and attached to a 100g mass on a rough horizontal
surface. The pulley has a mass of 30g and a radius of 3.5cm. The
string moves without slipping over the pulley while the masses
move. The coefficient of kinetic friction between the rough surface
and the 100-g mass is 0.05. Calculate the acceleration of the
masses.

Two packing crates of masses
m1 = 10.0 kg
and
m2 = 4.70 kg
are connected by a light string that passes over a frictionless
pulley as in the figure below. The 4.70-kg crate lies on a smooth
incline of angle 35.0°. Find the following.
Two crates are connected to each other by a string that passes
over a pulley, which is attached to the top corner of a wedge. The
crate of mass m1 hangs freely below the pulley....

Two boxes are connected by a rope strung over a pulley. Box A
with a mass of 5.0 kg sits on the surface of a plane inclined with
an angle of 33 degrees. The coefficient of static and kinetic
friction between the box A and the surface it sits on is 0.32 and
0.20 respectively. The rope connecting Box A and Box B is looped
over a frictionless pulley at the top of the incline and Box B
hangs free...

Two blocks with masses M1 and M2 are connected by a massless
string that passes over a massless pulley as shown.
M1 has a mass of 2.25 kg and is on an incline of θ1=46.5∘ with
coefficient of kinetic friction μ1=0.205.
M2 has a mass of 6.05 kg and is on an incline of θ2=33.5∘ with
coefficient of kinetic friction μ2=0.105.
The two‑block system is in motion with the block of mass M2
sliding down the ramp.
Find the magnitude...

Two blocks A and B with masses of 50 and 100 kg, respectively,
are connected by a rope, the pulley is frictionless and of
negligible mass. The coefficient of kinetic friction between block
A and the inclined plane is 0.25. If block A moves from C to D a
distance of 10m. Assume part of rest. Angle is 35.
Determine: a) The change in kinetic energy of block A, b) The
change in potential energy in block B, c) Calculate...

Two blocks (m1=5.5kg, m2=7.2kg
) are connected by a string that passes through a massless pulley
as shown in the Figure. The first block with mass
m1 slides up the inclined
plane when the system is released. The inclined plane makes an
angle θ = 310 with the
horizontal and the kinetic friction coefficient between the
inclined plane and m1 is
=0.35. Take g=10m/s2 Find
the speed of the block with mass m2 after it travels
h=5.6m.

Two masses, m1=2.00kg and
m2=1.00kg, are connected
together by a light string which passes over a light frictionless
pulley. The coefficient of friction bewteen m1 and
m2 is 0.35 and the friction
between m1 and the incline in negligible. If the mass,
m1, is initially moving down the incline find: a) th
acceleration of m2 and b) the
tension in the string. The incline is a 30 degree angle and the
m2 block is on top of m1 block.

A crate of mass 9.6 kg is pulled up a rough incline with an
initial speed of 1.40 m/s. The pulling force is 98 N parallel to
the incline, which makes an angle of 19.5° with the horizontal. The
coefficient of kinetic friction is 0.400, and the crate is pulled
4.98 m.
(a) How much work is done by the gravitational force on the
crate?
J
(b) Determine the increase in internal energy of the crate–incline
system owing to friction....

A crate of mass 9.6 kg is pulled up a rough incline with an
initial speed of 1.52 m/s. The pulling force is 104 N parallel to
the incline, which makes an angle of 20.4° with the horizontal. The
coefficient of kinetic friction is 0.400, and the crate is pulled
4.92 m.
(a) How much work is done by the gravitational force on the
crate?
J
(b) Determine the increase in internal energy of the crate–incline
system owing to friction....

A construction worker pushes on a 10 kg crate down an inclined
plane that is 7.0 m long and is inclined at an angle of 20 degrees
to the horizontal. As a result, the crate slides down the entire
length of the plane with a constant speed of 3.0 m/s. Suppose that
the worker pushes directly on the crate in a direction parallel to
the incline with a force of 50 N for the entire length of the
plane. A)...

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