Two baseballs are released at the same time. One is dropped from rest and the other is given an initial horizontal velocity. Which of the following is not true? Ignore atmospheric drag.
a. Both baseballs hit the ground at the same time.
b. Both have the same vertical component of velocity as they reach impact.
c. The horizontal component of velocity increases at a greater rate than the vertical component of velocity for both while they are both in the air.
d. The horizontally-released ball has a greater speed than the other ball for the whole trip.
[Ques. 2] Two projectiles are launched at 100 m/s, the angle of elevation for the first being 30 and for the second, 60. Which of the following statements is false?
a. Both projectiles have the same acceleration while in flight.
b. The second projectile has the lower speed at maximum altitude.
c. Both projectiles have the same range.
d. All of the above statements are false.
[Ques. 3] The highest mountain on Mars is Olympus Mons, rising 22,000 meters above the Martian surface. If we were to throw an object horizontally off the mountain top, how long would it take to reach the surface? Note: Ignore atmospheric drag forces and use gMars = 3.72 m/s2.
a. 1.8 minutes
c. 3.0 minutes
b. 2.4 minutes
d. 0.79 minute
[Ques. 4] A fireman, 40.0 m away from a burning building, directs a stream of water from a fire hose at an angle of 30.0 above the horizontal. If the initial speed of the stream is 40.0 m/s, at what height above the nozzle will the stream of water strike the building?
a. 9.60 m
c. 18.7 m
b. 16.6 m
d. 22.4 m
[Ques. 5] Wiley Coyote has missed the elusive Road Runner once again. This time, he leaves the edge of the cliff at 40.0 m/s horizontal velocity. If the canyon is 100 m deep, how far from his starting point on the edge of the cliff does the coyote land?
a. 207 m
c. 339 m
b. 247 m
d. 400 m
[Ques. 6] A baseball leaves the bat with a speed of 44.0 m/s and an angle of 30.0 above the horizontal. A 4.0-m high fence is located at a horizontal distance of 132 m from the point where the ball is struck. Assuming the ball leaves the bat 1.0 m above ground level, by how much does the ball clear the fence?
a. 18.9 m
c. 9.8 m
b. 14.4 m
d. 5.4 m
[Ques. 7] A ball is launched from ground level at 30 m/s at an angle of 25 above the horizontal. How far does it go before it is at ground level again?
a. 14 m
c. 43 m
b. 70 m
d. 86 m
[Ques. 8] Superguy is flying at treetop level near Paris when he sees the Eiffel Tower elevator start to fall (the cable snapped). His x-ray vision tells him Lois LaTour is inside. If Superguy is 1.00 km away from the tower, and the elevator falls from a height of 2.1 102 m, how long does Superguy have to save Lois, and what must be his average speed?
a. 4.5 s, 200 m/s
c. 7.0 s, 140 m/s
b. 6.5 s, 150 m/s
d. 9.0 s, 110 m/s
[Ques. 9] A track star in the broad jump goes into the jump at 10 m/s and launches himself at 20 above the horizontal. How long is he in the air before returning to Earth? Note: g = 9.8 m/s2.
a. 0.35 s
c. 0.70 s
b. 0.42 s
d. 0.89 s
[Ques. 10] A rifle is aimed horizontally toward the center of a target 71 m away. If the bullet strikes 10 cm below the center, what was the velocity of the bullet? Note: Ignore air friction.
a. 300 m/s
c. 500 m/s
b. 330 m/s
d. 700 m/s
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