Physics Unit 1 Quiz 4

1. An object in free fall

Experiences no air resistance

Undergoes a downward acceleration

Has an acceleration with a magnitude of 9.81 m/s^2 near Earth's surface

All of the above

2. If you drive west at 20 km/h for one hour, then drive east at 15 km/h for one hour, your net displacement will be

5 km east

35 km west

35 km east

5 km west

3. A vector has components x = 6m and y = 8m. What is its magnitude and direction?

10 m and 30 degrees

14 m and 37 degrees

10 m and 53 degrees

14 m and 53 degrees

4. A projectile is launched vertically upward at 50 m/s. If air resistance is negligible, its speed upon returning to its starting point is

More than 50 m/s

Less than 50 m/s

50 m/s

5. A gumdrop is released from rest at the top of the Empire State Building, which is 381 meters tall. Disregarding air resistance, calculate the displacement of the gumdrop after 1.00, 2.00, and 3.00 s.

-4.9 m, -9.8 m, -14.7 m

-4.9 m, -19.6 m, -44.1 m

4.9 m, 9.8 m, 14.7 m

4.9 m, 19.6 m, 44.1 m

6. A movie director is shooting a scene that involves dropping a stunt dummy out of an airplane and into a swimming pool. The plane is 10.0 m above the ground, traveling at a velocity of 22.5 m/s in the positive x direction. The director wants to know where in the plane's path the dummy should be dropped so that it will land in the pool. What is the dummy's horizontal displacement?

25 m

110 m

50 m

32 m

7. We went to the catwalk in the PAC, dropped tennis balls and measured the time it took for them to reach the floor (assume the floor is flat, not slanted). If we had thrown the balls horizontally instead of dropping them, they would have taken

More time

Less time

Same amount of time

8. An airplane flies at a constant horizontal speed. The pilot drops a heavy package which falls to the ground. Where, approximately, does the package land relative to the plane's new position? (neglect air resistance)

Beneath the plane

Behind the plane

In front of the plane

9. Certain iguanas have been observed to run as fast as 10 m/s. Suppose an iguana runs in a straight line at this speed for 5.00 s. The direction of motion makes an angle of 30 degrees to the east of north. Find the value of the iguana's northward displacement.

43.3 m

5 m/s

25 m

8.7 m/s