1. Use the exact values you enter in previous answer(s) to make later calculatio

Question

1. Use the exact values you enter in previous answer(s) to make later calculation(s).

A drag racer is able to complete the 0.40-km course (0.25 mi) in 9.8 s.
(a) If her acceleration is constant, what is a?


m/s2

(b) What is her speed when she is halfway to the finish line?


m/s

2. A car has a velocity of 18 m/s at t = 9.5 s. It then accelerates uniformly and reaches a velocity of 47 m/s at t = 14.5 s. What is its acceleration during th

(a) What is the speed of the ball when it passes by the cliff on its way down to the ground?
m/s

(b) What is the speed of the ball when it hits the ground? Ignore air drag. Assume the ball is thrown straight up.
  m/s

4. You are a passenger (m = 115 kg) in an airplane that is accelerating on the runway, beginning to take off. The force between your back and your seat is 405 N. Starting from rest, how far does the plane travel as it accelerates to a takeoff speed of 135 m/s?

5.Your moving company runs out of rope and hand trucks, so you are forced to push two crates along the floor as shown in the figure below. The crates are moving at constant velocity, their masses are m1 = 47 kg and m2 = 23 kg, and the coefficients of kinetic friction between both crates and the floor are 0.31. Find the normal force between the two crates.
N

6.If LeBron James can jump 1.5 m high on Earth, how high could he jump on Mercury (assume an indoor court), where

1. Use the exact values you enter in previous answer(s) to make later calculation(s). A drag racer is able to complete the 0.40-km course (0.25 mi) in 9.8 s. (a) If her acceleration is constant, what is a? m/s2 (b) What is her speed when she is halfway to the finish line? m/s 2. A car has a velocity of 18 m/s at t = 9.5 s. It then accelerates uniformly and reaches a velocity of 47 m/s at t = 14.5 s. What is its acceleration during th is period? (Enter the magnitude of the acceleration.) 3. A ball is thrown upward with a speed of 33 m/s from the edge of a cliff of height h = 17 m. (a) What is the speed of the ball when it passes by the cliff on its way down to the ground? m/s (b) What is the speed of the ball when it hits the ground? Ignore air drag. Assume the ball is thrown straight up. m/s 4. You are a passenger (m = 115 kg) in an airplane that is accelerating on the runway, beginning to take off. The force between your back and your seat is 405 N. Starting from rest, how far does the plane travel as it accelerates to a takeoff speed of 135 m/s? 5.Your moving company runs out of rope and hand trucks, so you are forced to push two crates along the floor as shown in the figure below. The crates are moving at constant velocity, their masses are m1 = 47 kg and m2 = 23 kg, and the coefficients of kinetic friction between both crates and the floor are 0.31. Find the normal force between the two crates. N 6.If LeBron James can jump 1.5 m high on Earth, how high could he jump on Mercury (assume an indoor court), where g = 3.7 m/s2?

Explanation / Answer

2) Initial velocity (u) of the car = 18 m/s Final velocity (v) of the car = 47 m/s Time taken to change the velocity of the car is dt = 14.5 s - 9.5 s                                                                          = 5.0 s Acceleration (a) of the car during this time period is         a = (dv) / (dt)            = (47 m/s - 18 m/s) / (5 s)            = 5.8 m/s2 As per CRAMSTER rules, one question should be done in each post. So please post the remaining questions as sepaarate. As per CRAMSTER rules, one question should be done in each post. So please post the remaining questions as sepaarate.

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