Question Details
1. The distance from the floor to the ceiling of an elevator is 2.8m. Suppose this elevator is moving with an upward, constantacceleration of 1.2 m/s2. At the instant its upward velocityreaches 2.6 m/s, a loose bolt drops from the ceiling. Calculate thefollowing. Define upward as the positive y-direction.
(a) the boltâs total time of flight between dropping from theceiling and hitting the floor
Answer:
(b) the boltâs displacement (â¬?yb ) between dropping from theceiling and hitting the floor
Answer:
(c) the bolts velocity (â¬vB ) and the floorâs velocity (â¬vF ) theinstant before the bolt hits the floor
Answer:
Answer:
2. You are standing on the top of the empire state building (330 mabove the ground)
when Superman flies past. You notice that he is headed straightdown at a constant speed
of 35.0 m/s. At the instant he goes past, you drop a 10.0 kg leadball over the edge.
Note: define upward direction as positive, neglect airresistance.
Question: Will the ball pass superman before reaching the ground?If your answer is NO,
perform calculations to support this? If your answer is YES,calculate the following:
(a) the height above the ground that this occurs. (Answer: )
(b) the velocity vector of the ball when this occurs. (Answer:)
(c) Sketch the plots of a-versus-t, v-versus-t, and y-versus-t forboth superman and the
ball. Put both plots on the same set of axes and label them (S orB).
y
t
t
t
v
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Question Details
1. The distance from the floor to the ceiling of an elevator is 2.8m. Suppose this elevator is moving with an upward, constantacceleration of 1.2 m/s2. At the instant its upward velocityreaches 2.6 m/s, a loose bolt drops from the ceiling. Calculate thefollowing. Define upward as the positive y-direction.
(a) the boltâs total time of flight between dropping from theceiling and hitting the floor
Answer:
(b) the boltâs displacement (â¬?yb ) between dropping from theceiling and hitting the floor
Answer:
(c) the bolts velocity (â¬vB ) and the floorâs velocity (â¬vF ) theinstant before the bolt hits the floor
Answer:
Answer:
2. You are standing on the top of the empire state building (330 mabove the ground)
when Superman flies past. You notice that he is headed straightdown at a constant speed
of 35.0 m/s. At the instant he goes past, you drop a 10.0 kg leadball over the edge.
Note: define upward direction as positive, neglect airresistance.
Question: Will the ball pass superman before reaching the ground?If your answer is NO,
perform calculations to support this? If your answer is YES,calculate the following:
(a) the height above the ground that this occurs. (Answer: )
(b) the velocity vector of the ball when this occurs. (Answer:)
(c) Sketch the plots of a-versus-t, v-versus-t, and y-versus-t forboth superman and the
ball. Put both plots on the same set of axes and label them (S orB).
y
t
t
t
v
a Share:by email on facebook on twitter flag question for abuse
