A nurse was arrested for making death threats with a gun, then subsequently admitted to a psychiatric facility, and diagnosed wi

The frictional force acting between the block and the surface will lessen.

Response:

C

Analysis:

It is well-known that felines are active during the night.

To calculate total mechanical energy, apply the formula:

total mechanical energy = KE + PE
KE = (1/2)mv^2
=(1/2) x 8 x (20)^2 = 1600 J
For PE, use mgh
g ≈ 10 m/s^2

= 8 x 10 x 85 = 6800 J


Thus, total mechanical energy is 1600 + 6800 = 8400 J

2 and 5

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