Physics Review Task 1

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Answer the questions correctly without using up your two lives!

Kristine Vester

United States

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Physics Review Task 1


Physics Review Task 1Version en ligne Answer the questions correctly without using up your two lives! par Kristine Vester 1 When a bullet is fired from a rifle, the bullet and the rifle acquire a I only b II only c III only d I and III only e I, II, and III 2 A 1000 N force acts for 1 s on a 50 kg object which was initially at rest. What is the object’s change in velocity? a 10 m/s b 20 m/s c 30 m/s d 40 m/s e 50 m/s 3 A 0.2 kg hockey puck is sliding along the ice with an initial speed of 10 m/s when a player strikes it with his stick, causing it to reverse its direction and giving it a speed of 25 m/s. The impulse the stick applies to the puck is most nearly a 1 N·s b 3 N·s c 5 N·s d 7 N·s e 9 N·s 4 If the momentum of an object is tripled, by what factor will its kinetic energy change? a 1 b 2 c 3 d 6 e 9 5 A toy railroad car of mass 6 kg moving east collides with a 3 kg railroad car at rest, and the two cars lock together on impact and move away together toward the east at 2 m/s. The speed of the first car before the collision is a 2 m/s b 3 m/s c 4 m/s d 6 m/s 6 A baseball of mass 0.15 kg is thrown with a speed of 20 m/s to a batter who hits a line drive straight back at the pitcher with a speed of 60 m/s. The ball is in contact with the bat for 0.025 s. What average force is exerted on the ball by the bat? a 100 N b 150 N c 220 N d 360 N e 480 N