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Each raindrop has a mass of 3.7 x 104 kg and speed of 2.5 m/s before impact and is at rest after the impact. If, on average at a given time, 150 raindrops strike each square meter, what is the impulse of the rain striking the car? A) 0.69 N s B) 0.046 N-s C) 0.14 N-s D) 11 N-s E) 21 N s

Each raindrop has a mass of 3.7 x 104 kg and speed of 2.5 m/s before impact and is at rest after the impact. If, on average at a given time, 150 raindrops strike each square meter, what is the impulse of the rain striking the car? A) 0.69 N s B) 0.046 N-s C) 0.14 N-s D) 11 N-s E) 21 N s

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
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1. While a car is stopped at a traffic light in a storm, raindrops strike the roof of the car. The area of the roof is 5.0 m². Each raindrop has a mass of 3.7 x 10 kg and speed of 2.5 m/s before impact and is at rest after the impact. If, on average at a given time, 150 raindrops strike each square meter, what is the impulse of the rain striking the car? A) 0.69 N-s B) 0.046 N s C) 0.14 N-s D) 11 N-s E) 21 N s 2. A bat strikes a 0.050-kg baseball so that its velocity changes by +32 m/s in 0.080 s. With what average force was the ball struck? A) +20 N B) -20 N C) +200 N D) -200 N E) +10 N 3. The head of a hammer (m=1.5 kg) moving at 4.5 m/s strikes a nail and bounces back with the same speed after an elastic collision lasting 0.075 s. What is the magnitude of the average force the hammer exerts on the nail? A) 6.8 N B) 60 N C) 90 N D) 180 N E) 240 N 4. A football player kicks a 0.41-kg football initially at rest; and the ball flies through the air. If the kicker's foot was in contact with the ball for 0.051 s and the ball's initial speed after the collision is 21 m/s, what was the magnitude of the average force on the football? A) 9.7 N B) 46 N C) 81 N D) 170 N E) 210 N 5. A 100-kg cannon at rest contains a 10-kg cannon ball. When fired, the cannon ball leaves the cannon with a speed of 90 m/s. What is the recoil speed of the cannon? A) 4.5 m/s B) 9 m/s C) 45 m/s D) 90 m/s E) zero m/s 6. A 50-kg toboggan is coasting on level snow. As it passes beneath a bridge, a 20-kg parcel is dropped straight down and lands in the toboggan. If KE, is the original kinetic energy of the toboggan and KE₂ is the kinetic energy after the parcel has been added, what is the ratio KE₂/KE1. A) 0.4 B) 0.6 C) 0.7 D) 0.8 E) 1
Transcribed Image Text:1. While a car is stopped at a traffic light in a storm, raindrops strike the roof of the car. The area of the roof is 5.0 m². Each raindrop has a mass of 3.7 x 10 kg and speed of 2.5 m/s before impact and is at rest after the impact. If, on average at a given time, 150 raindrops strike each square meter, what is the impulse of the rain striking the car? A) 0.69 N-s B) 0.046 N s C) 0.14 N-s D) 11 N-s E) 21 N s 2. A bat strikes a 0.050-kg baseball so that its velocity changes by +32 m/s in 0.080 s. With what average force was the ball struck? A) +20 N B) -20 N C) +200 N D) -200 N E) +10 N 3. The head of a hammer (m=1.5 kg) moving at 4.5 m/s strikes a nail and bounces back with the same speed after an elastic collision lasting 0.075 s. What is the magnitude of the average force the hammer exerts on the nail? A) 6.8 N B) 60 N C) 90 N D) 180 N E) 240 N 4. A football player kicks a 0.41-kg football initially at rest; and the ball flies through the air. If the kicker's foot was in contact with the ball for 0.051 s and the ball's initial speed after the collision is 21 m/s, what was the magnitude of the average force on the football? A) 9.7 N B) 46 N C) 81 N D) 170 N E) 210 N 5. A 100-kg cannon at rest contains a 10-kg cannon ball. When fired, the cannon ball leaves the cannon with a speed of 90 m/s. What is the recoil speed of the cannon? A) 4.5 m/s B) 9 m/s C) 45 m/s D) 90 m/s E) zero m/s 6. A 50-kg toboggan is coasting on level snow. As it passes beneath a bridge, a 20-kg parcel is dropped straight down and lands in the toboggan. If KE, is the original kinetic energy of the toboggan and KE₂ is the kinetic energy after the parcel has been added, what is the ratio KE₂/KE1. A) 0.4 B) 0.6 C) 0.7 D) 0.8 E) 1
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