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Chapter 11: Q. 35 (page 288)
A small rocket with 15 kN thrust burns 250 kg of fuel in 30 s. What is the exhaust speed of the hot gases?
The exhaust speed is
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A archer, standing on frictionless ice, shoots a arrow at a speed of . What is the recoil speed of the archer?
A ball of clay traveling east at collides with a ball of clay traveling north at . What are the speed and the direction of the resulting ball of clay? Give your answer as an angle north of east.
A 100 g ball moving to the right at 4.0 m/s collides head-on with a 200 g ball that is moving to the left at 3.0 m/s.
a. If the collision is perfectly elastic, what are the speed and direction of each ball after the collision?
b. If the collision is perfectly inelastic, what are the speed and direction of the combined balls after the collision?
Three identical train cars, coupled together, are rolling east at speed . A fourth car traveling east at catches up with the three and couples to make a four-car train. A moment later, the train cars hit a fifth car that was at rest on the tracks, and it couples to make a five-car train. What is the speed of the five-car train?
A firecracker in a coconut blows the coconut into three pieces. Two pieces of equal mass fly off south and west, perpendicular to each other, at speed . The third piece has twice the mass as the other two. What are the speed and direction of the third piece? Give the direction as an angle east of north
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