Question

5. A car weighs 2200 lbs. Its mass is

a. 2.2 kg
b. 2200 kg
c. 9.8 kg
d. 1000 kg

6. The weight of an object

a. is related to the quantity of matter it contains
b. is essentially the same as its mass but expressed in different units
c. is the force with which it is attracted to the Earth
d. remains unchanged as the height varies

7. The action and reaction forces referred to in the third law of motion

a. are equal in strength and act in the same direction
b. are equal in strength but act in opposite directions
c. act upon the same body
d. always act at right angles to each other

8. Which of the following is a vector quantity

a. time
b. speed
c. mass
d. velocity

9. Which of the following units could be associated with a vector quantity

a. kg
b. seconds
c. cubic m (m³)
d. N

10. An astronaut whose mass is 80 kg on the Earth is in a spacecraft at an altitude of 10 Earth radii above the Earth's surface. His mass there is

a. 8 kg
b. 80 kg
c. 100 kg
d. 40 kg

11. A 2400-kg car whose speed is 6 m/s, rounds a turn whose radius is 60 m. The centripetal force on the car is

a. 1440 N
b. 240 N
c. 147 N
d. 48 N

12. A moving object must have

a. potential energy
b. acceleration
c. kinetic energy
d. all of the above

13. The work done in holding a 100-kg object at a height of 4 m above the floor for 20 s is

a. 0 J
b. 500 J
c. 1000 J
d. 98,000 J

14. A temperature of 98.6°F is the same as a temperature of

a. 98.6°C
b. 37°C
c. 100°C
d. 0°C

15. A 20-kg boy runs up a flight of stairs 4 m high in 4 s. His power output is

a. 80 W
b. 196 W
c. 320 W
d. 784 W

(Note: m/s² is unit of accelaration "meter per second squared")

Answer 1