7. A 8 g bullet is fired horizontally into a 9 kg cube of wood, which is at rest, and sticks in it. The cube is free to move and has a speed of 40 cm/s after impact. Find the initial velocity of the bullet 8. A 0.25 kg ball moving in the + x direction at 13 m/s is hit by a bat. Its final velocity is 19 m/s in the – x direction. The bat acts on the ball for 0.010 s. Find the average force exerted on the ball by the bat. 9. An empty 15000 kg coal car is coasting on a level track at 5 m/s. Suddenly 5000 kg of coal is dumped into it from directly above it. The coal initially has a zero horizontal velocity. Find the final speed of the car
7. A 8 g bullet is fired horizontally into a 9 kg cube of wood, which is at rest, and sticks in it. The cube is free to move and has a speed of 40 cm/s after impact. Find the initial velocity of the bullet 8. A 0.25 kg ball moving in the + x direction at 13 m/s is hit by a bat. Its final velocity is 19 m/s in the – x direction. The bat acts on the ball for 0.010 s. Find the average force exerted on the ball by the bat. 9. An empty 15000 kg coal car is coasting on a level track at 5 m/s. Suddenly 5000 kg of coal is dumped into it from directly above it. The coal initially has a zero horizontal velocity. Find the final speed of the car
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:7. A 8 g bullet is fired horizontally into a 9 kg cube of wood, which is at rest, and sticks in it. The cube is
free to move and has a speed of 40 cm/s after impact. Find the initial velocity of the bullet
8. A 0.25 kg ball moving in the + x direction at 13 m/s is hit by a bat. Its final velocity is 19 m/s in the – x
direction. The bat acts on the ball for 0.010 s. Find the average force exerted on the ball by the bat.
9. An empty 15000 kg coal car is coasting on a level track at 5 m/s. Suddenly 5000 kg of coal is dumped
into it from directly above it. The coal initially has a zero horizontal velocity. Find the final speed of the
car
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