Please help! This is due in three hours and I don't know how to do these!
1.A block accelerates at 3.1 m/s2 down a plane
inclined at an angle 24.0◦.
Find μk between the block and the inclined plane. The acceleration of gravity is
9.81 m/s2 .
2.Two blocks connected by a string are pulled
across a rough horizontal surface by a force
applied to one of the blocks.
The acceleration of gravity is 9.8 m/s2.
3 kg
8 kg
40◦
μ = 0.71
If each block has an acceleration of 2.7 m/s2
to the right, what is the magnitude of the
applied force?
Answer in units of N.
3. A snowboarder of mass 60 kg is at rest on
the top of a sand dune. The coefficients of
static and kinetic friction are 0.55 and 0.4675,
respectively.
60 kg
μk = 0.4675
μs = 0.55
�
What is the angle � the incline must exceed
so that the snowboarder starts sliding? The
acceleration of gravity is 9.8 m/s2.
Answer in units of ◦.
4. What is the acceleration down the incline if theta� = 35 ◦, exceeding the value found in the
previous question?