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1174338498

# 1174338498 - HW Chapter 4 4.11 A hockey puck with mass...

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HW Chapter 4 4.11 A hockey puck with mass 0.160 kg is at rest at the origin (x = 0) on the horizontal, frictionless surface of the ring. At time t = 0 a player applies a force of 0.250 N to the puck, parallel to the x-axis; he continues to apply this force until t = 2.00 s. a) What are the position and speed of the puck at t = 2.00 s? b) If the same force is again applied at t = 5.00 s, what are the position and speed of the puck at t = 7.00 s? 4. 14 An electron (mass = 9.11 × 10 -31 kg) leaves one end of a TV picture tube with zero initial speed and travels in a straight line to the accelerating grid, which is 1.80 cm away. It reaches the grid with a speed of 3.00 × 10 6 m/s. If the accelerating force is constant, compute a) the acceleration; b) the time to reach the grid; c) the net force, in newtons. (You can ignore the gravitational force on the electron.) 4.17 At the surface of Jupiter’s moon Io, the acceleration due to gravity is g = 1.81 m/s 2 . A watermelon weighs 44.0 N at the surface of the earth. a) What is its mass on the earth’s

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1174338498 - HW Chapter 4 4.11 A hockey puck with mass...

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