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In 1865 Jules Verne proposed sending men to the Moon by firing a space capsule from a 220-m-long In 1865 Jules Verne proposed sending men to the Moon by firing a space capsule from a 220-m-long cannon with final speed of 10.97 km/s. What would have been the unrealistically large acceleration experienced by the space […]

Liz rushes down onto a subway platform Liz rushes down onto a subway platform to find her train already departing. She stops and watches the cars go by. Each car is 8.60m long. The first moves past her in 1.50 s and the second in 1.10 s. find the constant acceleration of the train. Is […]

Launch of the Space Shuttle at launch Launch of the Space Shuttle at launch the space shuttle weighs 4.5 million pounds. When it is launched from rest, it takes 8.00 s to reach 161 km/h, and at the end of the first 1.00 min its speed is 1610 km/h. (a) What is the average acceleration […]

object moves along equation x (t) = (3.00t2 – 2.00t + 3.00) An object moves along the x axis according to the equation x (t) = (3.00t2 – 2.00t + 3.00) m. Determine (a) The average speed between t = 2.00 s and t = 3.00 s, (b) The instantaneous speed at t = 2.00 […]

On a 20-mile bike ride, you ride On a 20-mile bike ride, you ride the first 10 miles at an average speed of 8 mi/b. What must your average speed over the next 10 miles be to have your average speed for the total 20 miles be (a) 4 mi/b? (b) 12 mi/b? (c) Given […]

Mars Landing In January 2004, NASA Mars Landing In January 2004, NASA landed exploration vehicles on Mars. Part of the descent consisted of the following stages: Stage A: Friction with the atmosphere reduced the speed from 19,300 km/h to 1600 km/h in 4.0 min. Stage B: A parachute then opened to slow it down to […]

Margaret has just enough gas in her speedboat to get Margaret has just enough gas in her speedboat to get to the marina, an upstream journey that takes 4.0 h. Finding it closed for the season, she spends the next 8.0 h floating back downstream to her shack. The entire trip took 12.0 h; how […]

Juggling Act a juggler performs in a room Juggling Act a juggler performs in a room whose ceiling is 3.0 m above the level of his hands. He throws a ball upward so that it just reaches the ceiling. (a) What is the initial velocity of the ball? (b) What is the time required for […]

In a classroom demonstration, a glider moves along an inclined In a classroom demonstration, a glider moves along an inclined air track with constant acceleration a. It is projected from the start of the track (x = 0) with an initial velocity v0. At time t = 8 s, it is at x = 100 […]

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