An elevator moves downward in a tall building at a constant speed of 5.00 m/s. Exactly 5.00 s after the top of the elevator car passes a bolt loosely attached to the wall of the elevator shaft, the bolt falls from rest, (a) At what time does the bolt hit the top of the still-descending elevator? (b) In what way is this problem similar to Example 2.8? (c) Estimate the highest floor from which the bolt can fall if the elevator reaches the ground floor before the boll hits the top of the elevator.
An elevator moves downward in a tall building at a constant speed of 5.00 m/s. Exactly 5.00 s after the top of the elevator car passes a bolt loosely attached to the wall of the elevator shaft, the bolt falls from rest, (a) At what time does the bolt hit the top of the still-descending elevator? (b) In what way is this problem similar to Example 2.8? (c) Estimate the highest floor from which the bolt can fall if the elevator reaches the ground floor before the boll hits the top of the elevator.
Solution Summary: The author determines the time when the bolt hit the top of the still-descending elevator.
An elevator moves downward in a tall building at a constant speed of 5.00 m/s. Exactly 5.00 s after the top of the elevator car passes a bolt loosely attached to the wall of the elevator shaft, the bolt falls from rest, (a) At what time does the bolt hit the top of the still-descending elevator? (b) In what way is this problem similar to Example 2.8? (c) Estimate the highest floor from which the bolt can fall if the elevator reaches the ground floor before the boll hits the top of the elevator.
After jumping, a skydiver descends vertically towards the ground, with the parachute open, at a constant velocity of 4.9 m/s. When passing a height of 12.5 m, he drops a coin that was in his pocket. What is the time difference between the arrival of the coin and the parachutist on the ground? Disregard, in the coin's movement, the resistance of the air and use that the acceleration of gravity has a module of 10.00 m/s2.
a. 4,70 s
b. None of the other alternatives.
c. 1,58 s
d. 1,39 s
e. They hit the ground at the same time.
f. 2,55 s
g. 1,17 s
h. 0,97 s
If a ball is thrown straight up into the air with an initial velocity of 70 ft/s, it height in feet after ? second is given by y=70t−16t^2. Find the average velocity for the time period begining when t=2 and lasting
0.1 seconds =
0.01 seconds=
0.001 seconds=
Finally based on the above results, guess what the instantaneous velocity of the ball is when ?=2.
A swimmer bounces straight up from a diving board and falls feet first into a pool. She starts with a velocity of 4.00 m/s, and her takeoff point is 1.80 m above the pool.
How long are her feet in the air? Answer in 2 decimal places.
What is her highest point above the board? Answer in 2 decimal places.
What is her velocity when her feet hit the water? Answer in 2 decimal places.
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