mg 10 1. The application of a horizontal force Fp results in a block of mass m moving at constant speed up a frictionless incline (making an angle 6
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# Unfortunately, I've

been doing the questions for hours and I cannot solve them. I worked in groups and just found all of the problems difficult below, would you be able to see if you could solve these?  mg
10
1. The application of a horizontal force Fp results in a block of mass m moving at constant
speed up a frictionless incline (making an angle 6 with the horizontal) for a distance As.
(a) How much work does the normal force do? (b) How much work does the force Fp do in
terms of m, g, 8, and As? (e) Which force lifts the block vertically?
FIG. 1. Mass and spring system.
2. A mass (m = 0.8 kg) is pressed down on a vertical spring (k = 100 N/m) until the
spring compresses by d = 0.15 m from its non-perturbed length. The block is then released
from rest and allowed to ascend. The block is not connected to the end of the spring so it
may rise as depicted in the figure. Does the block, in fact, rise above the end of the spring?
If so, by how much distance? 3. A block weighing 10 Newtons is dropped from a height h = 12 cm above a (correctly
calibrated) spring balance with k = 1000 N/m. What maximum weight will the balance
B
h
4. Two blocks (my = 1 kg, mg = 2 kg) are attached by a light cord as depicted in
the figure. The hanging block is released from rest and falls to the ground from a height
h = 0.50 m. The block on the table consequently slides a total distance d = 0.80 m.
Determine the coefficient of kinetic friction between table and block.
5. A uniform chain of length 8.00 m initially lies stretched out on a horizontal table. (a)
If the coefficient of static friction between the chain and table is 0.600, show that the chain
will begin to slide off the table if at least 3.00 m of it hangs over the edge of the table. (b)
Determine the speed of the chain as all of it leaves the table, given that the coefficient of
kinetic friction between the chain and table is 0.400. Hint: Use energy methods and locate
the hanging portion of the chain by its center.

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