QUIZ 3 “Nota” means none of the above
(a) 10 m/s (b) 34 m/s (c) 9 m/s
(a) greater than on the moon (b) less than on the moon (c) the same as on the moon (d) nota
(a) 3 kg m/s (b) 20 kg m/s (c) 60 kg m/s (d) nota
4. A car crashes into a wall at 25 m/s and is brought to rest in 0.1
second. What is the average
force exerted on a 10–kg test dummy by the seat belt?
(a) 2500 N (b) 250 N (c) 25N (d) nota
5. A diesel engine weighs 3 times as much as a freight car. If the diesel engine coasts at 1 km/h into freight- car initially at rest, how fast do the two coast after they couple together (stick together) ?
(a) 4/3 km/h (b) 3/4 km/h (c) 1 km/h (d) nota
6. When the velocity of an object is tripled, by what factor is the momentum changed ?
(a) 1/3 (b) 9 (c) 3 (d) nota
7. When
the velocity of an object is tripled, by what factor is the kinetic energy (KE)
changed ?
(a) 1/3 (b) 9 (c) 3 (d) nota
8. A what point in its motion is the KE of a pendulum a maximum?
(a) at the highest point (b) at the lowest point (c) nota
9. A what point in its motion is the PE (potential energy) of a pendulum a maximum?
(a) at the highest point (b) at the lowest point (c) nota
10. What produces the greater change in KE: exerting a 10-N force for a
distance of 5 m , or exerting a 20–N force for a distance of 2.5 m ?
(a) exerting a 10-N force for a distance of 5 m (b) exerting a 20–N force for a distance of 2.5 m (c) both the same (d) nota