Physics Unit 1 Quiz 4
9 Questions
| Total Attempts: 164
Questions and Answers
- 1.An object in free fall
- A.
Experiences no air resistance
- B.
Undergoes a downward acceleration
- C.
Has an acceleration with a magnitude of 9.81 m/s^2 near Earth's surface
- D.
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
- A.
5 km east
- B.
35 km west
- C.
35 km east
- D.
5 km west
- 3.A vector has components x = 6m and y = 8m. What is its magnitude and direction?
- A.
10 m and 30 degrees
- B.
14 m and 37 degrees
- C.
10 m and 53 degrees
- D.
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
- A.
More than 50 m/s
- B.
Less than 50 m/s
- C.
50 m/s
- 5.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
- A.
More time
- B.
Less time
- C.
Same amount of time
- 6.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)
- A.
Beneath the plane
- B.
Behind the plane
- C.
In front of the plane
- 7.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.
- A.
-4.9 m, -9.8 m, -14.7 m
- B.
-4.9 m, -19.6 m, -44.1 m
- C.
4.9 m, 9.8 m, 14.7 m
- D.
4.9 m, 19.6 m, 44.1 m
- 8.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.
- A.
43.3 m
- B.
5 m/s
- C.
25 m
- D.
8.7 m/s
- 9.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?
- A.
25 m
- B.
110 m
- C.
50 m
- D.
32 m
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