Open Question
b. The motor of a 350 g model rocket generates 9.5 N thrust. If air resistance can be neglected, what will be the rocket's speed as it reaches a height of 85 m?
2. 1D Motion / Kinematics
Vertical Motion and Free Fall
Back2. 1D Motion / Kinematics
Vertical Motion and Free Fall
- Open Question
(I) If a car rolls gently (v₀ = 0) off a vertical cliff, how long does it take it to reach 55 km/h?
- Open QuestionA large boulder is ejected vertically upward from a volcano with an initial speed of 40.0 m/s. Ignore air resistance. (a) At what time after being ejected is the boulder moving at 20.0 m/s upward?
- Multiple Choice
A rock is thrown vertically upward with a speed of 27.0 m/s from the roof of a 31.0-m-tall building. The rock doesn't hit the building on its way back down and lands in the street below. (a) What is the speed of the rock just before it hits the street? (b) How much time elapses from when the rock is thrown until it hits the street?
- Multiple Choice
A student throws a set of keys vertically upward to her sorority sister who is in a window 14.00 m above. The second student catches the keys 1.50 s later. (a) With what initial velocity were the keys thrown? (b) What was the velocity of the keys just before they were caught?
- Multiple ChoiceA steel ball is dropped onto a thick piece of foam. The ball is released 2.0 meters above the foam. The foam compresses as the ball comes to rest. How fast is the ball moving when it first hits the foam? Ignore air resistance.
- Multiple ChoiceA steel ball is dropped onto a thick piece of foam. The ball is released 2.5 meters above the foam. The foam compresses as the ball comes to rest. What is the magnitude of the ball's acceleration as it comes to rest on the foam? Ignore air resistance.
- Multiple ChoiceA toy rocket starts on the ground at rest. Its engine burns for giving it a constant acceleration of . What is the maximum height achieved by the rocket?
- Open QuestionA hotel elevator ascends 200 m with a maximum speed of 5.0 m/s. Its acceleration and deceleration both have a magnitude of 1.0 m/s².b. How long does it take to make the complete trip from bottom to top?
- Open QuestionWhen jumping, a flea accelerates at an astounding 1000 m/s^2, but over only the very short distance of 0.50 mm. If a flea jumps straight up, and if air resistance is neglected (a rather poor approximation in this situation), how high does the flea go?
- Open QuestionA 200 kg weather rocket is loaded with 100 kg of fuel and fired straight up. It accelerates upward at 30 m/s² for 30 s, then runs out of fuel. Ignore any air resistance effects.a. What is the rocket's maximum altitude?
- Open QuestionA 1000 kg weather rocket is launched straight up. The rocket motor provides a constant acceleration for 16 s, then the motor stops. The rocket altitude 20 s after launch is 5100 m. You can ignore any effects of air resistance. What was the rocket's acceleration during the first 16 s?
- Open QuestionA rock is tossed straight up from ground level with a speed of 20 m/s. When it returns, it falls into a hole 10 m deep. (a) What is the rock's speed as it hits the bottom of the hole?
- Open QuestionA lead ball is dropped into a lake from a diving board 5.0 m above the water. After entering the water, it sinks to the bottom with a constant velocity equal to the velocity with which it hit the water. The ball reaches the bottom 3.0 s after it is released. How deep is the lake?
- Open QuestionAs a science project, you drop a watermelon off the top of the Empire State Building, 320 m above the sidewalk. It so happens that Superman flies by at the instant you release the watermelon. Superman is headed straight down with a speed of 35 m/s. How fast is the watermelon going when it passes Superman?