PhysRozz

Midterm 2012

1. Which is not a vector quantity?
1) electric charge
2) displacement

5. As the angle between two concurrent forces decreases, the magnitude of the force required to produce equilibrium
1) decreases

3) velocity

[via06-07]

2) increases

3) remains the same

4) magnetic field strength

2. An astronaut standing on a platform on the Moon drops a hammer. If the hammer falls 6.0 meters vertically in 2.7 seconds, what is its acceleration?

6. A child walks 5.0 meters north, then 4.0 meters east, and finally 2.0 meters south. What is the magnitude of the resultant displacement of the child after the entire walk?

1) 4.4 m/s 2

2) 1.6 m/s 2

1) 1.0 m

2) 5.0 m

3) 2.2 m/s 2

4) 9.8 m/s 2

3) 3.0 m

4) 11.0 m

3. A 2.00-kilogram object weighs 19.6 newtons on
Earth. If the acceleration due to gravity on Mars is
3.71 meters per second 2 , what is the object’s mass on Mars?
1) 2.64 kg

2) 2.00 kg

3) 19.6 N

7. The diagram above represents a spring hanging vertically that stretches 0.075 meter when a 5.0newton block is attached. The spring-block system is at rest in the position shown.

4) 7.42 N

4. A car moves with a constant speed in a clockwise direction around a circular path of radius r, as represented in the diagram above.

The value of the spring constant is
1) 38 N/m
When the car is in the position shown, its acceleration is directed toward the
1) south 2) east

3) west

2) 650 N/m

3) 130 N/m

4) 67 N/m

4) north

Version 18

Midterm 2012
8. A 0.50-kilogram object moves in a horizontal circular path with a radius of 0.25 meter at a constant speed of 4.0 meters per second. What is the magnitude of the object’s acceleration?
1) 32 m/s 2

2) 64 m/s 2

3) 16 m/s 2

11. The table below lists the mass and speed of each of four objects.

4) 8.0 m/s 2