Physics 205 Ock Test 2 Form 2 Worksheet With Answers - Dr. Huerta, 2014 Page 4
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6Dr. Huerta Phy 205 oCK Test 2 FORM 2 ANSWER KEY March 3, 2014
[11] A 100 kg man is standing in an elevator that has an upward acceleration
2
of 1 m/s
. The normal force exerted by the floor of the elevator upon the
2
man is (take g=10 m/s
)
[a] 900 N
[b] 1000 N
[X] 1100 N
[d] 2200 N
[e] 0 N
[12] Two three man teams are pulling on a rope in a tug of war as shown below.
Each man is exerting a pull of 100 N on the rope using the friction between
the hand and the rope. The two teams are matched and the rope is in
equilibrium. The tension in the rope is
[a] 600 N [X] 300 N
[c] 200 N
[d] 100 N
[e] 0 N
A
B
C
[13] A uniform cube of side L is placed on the floor. A smaller cube of the same
density and of side L/2 (one eighth the mass) is placed on top of the large
one. How far from the floor is the center of mass of the system?
3L
7L
11L
17L
7L
[a]
[b]
[c]
[d]
[X]
4
8
8
36
12
[14] A ball with a mass of 0.2 kg is dropped from a height of 5 m. It hits the
floor and bounces up elastically with the same speed. The impulse the floor
2
has imparted to the ball is (Take g = 10 m/s
, and let the y-direction be
vertically up, with ˆ y a unit vector in the upward y-direction)
[a] zero
[b] 2ˆ y kg m/s
[c]
2ˆ y kg m/s [d]
4ˆ y kg m/s [X] 4ˆ y kg m/s
[15] A car of mass m = 1000 kg is moving with speed 20 m/s in the x direction.
A truck of mass 2000 kg is moving with speed 10 m/s in the y direction.The
car and the truck have a completely inelastic collision, so they stick together
after they collide. Find the the speed of the car and truck as they move
together after the collision.
20
20 2
40
20
[a] zero [b]
m/s [X]
m/s [d]
m/s [e]
m/s
3
3
3
3 2
Physics 205D TEST 2 FORM 2
March 3, 2014
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