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# Physics

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1. A 4.5 kg block is at rest on a table when it is attached to a second mass, m2 hanging over a pulley. The static coefficient of friction between the block and the table is 0.56 and kinetic coefficient is 0.42, respectively. The hanging mass, m2 is chosen to be 2.4 kg.
a) Will this choice for m2 set the system in motion?
b) If the system is set in motion, find the acceleration of the block and the tension in the string.

2. An object of mass 5 kg is acted upon by four forces, each of magnitude 10 N.
Which of the following could NOT be the acceleration of the object?
A) 0 m/s2 B) 2m/s2 C) 4 m/s2 D) 8 m/s2 E) 10 m/s2

3. Two metal spheres with the same diameter, one hollow and on solid, falls through
air from the 10th floor of a building.
A) The solid sphere will land first because it experiences less air resistance.
B) The hollow sphere will land first because it experiences less air resistance.
C) The solid sphere will land first because it has the largest weight, and the least effect of the air resistance.
D) They will land at the same time, because all objects fall with the same acceleration.

4. An object of mass 5 kg is acted upon by four forces, each of magnitude 10 N.
Which of the following could NOT be the acceleration of the object?
A) 0 m/s2 B) 2m/s2 C) 4 m/s2 D) 8 m/s2 E) 10 m/s2

Passage for questions 5 and 6:
An object is dropped out of a high-flying balloon. It reaches terminal velocity after 8 seconds.

5. During which time interval does the object travel the greatest distance?
A) 0-1s B) 2-3 s C) 4-5 s D) 6-7 s E) 8-9 s

6. During which time interval does the object increase its velocity by the greatest amount?
A) 0-1s B) 2-3 s C) 4-5 s D) 6-7 s E) 8-9 s