The next two questions refer to the following physical situation: Two blocks (masses m1 = 30...

The next two questions refer to the following physical situation:

Two blocks (masses m₁ = 30 kg and m₂ = 7 kg) sit atop one another as shown below. The coefficient of static friction between the blocks is μ_s= 0.32. There is no friction between the lower block and the surface on which it rests. A constant external force F is applied to the lower block.

What is F_max, the maximum magnitude of this force such that the upper block does not slide with respect to the lower block?

	a.	F_max = 158 N
	b.	F_max = 116 N
	c.	F_max = 61 N
	d.	F_max = 80 N
	e.	F_max = 141 N

If there is kinetic friction between the lower block and the surface, the magnitude of the maximum possible force F_max that can be exerted on the lower block before the upper block starts sliding with respect to the lower block...

	a.	stays the same.
	b.	decreases.
	c.	increases.

A precocious child wants to determine the moment of inertia, I_o, of the local merry-go-round. The child measures the radius of the merry-go-round (R = 2 m), then weighs herself (m = 25 kg), then notices that when she moves from the center of the merry-go-round to the rim, the rotational velocity of the merry-go-round changes from 0.3 rev/sec to 0.2 rev/sec. If the child treats herself as a point mass, what moment of inertia does she estimate for the merry-go-round?

	a.	I_o = 500 kg-m²
	b.	I_o = 300 kg-m²
	c.	I_o = 200 kg-m²
	d.	I_o = 400 kg-m²
	e.	I_o = 100 kg-m²

As the child moves from the center of the merry-go-round to the rim, the kinetic energy of the child plus the merry-go-round...

	a.	decreases.
	b.	stays the same.
	c.	increases

Expert Solution

genius_generous answered 2 years ago

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