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Chapter 11: Q. 36 (page 288)
A rocket in deep space has an empty mass of kg and exhausts the hot gases of burned fuel at m/s. What mass of fuel is needed to reach a top speed of m/s?
The mass of fuel needed to reach the maximum speed is.
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Most geologists believe that the dinosaurs became extinct 65 million years ago when a large comet or asteroid struck the earth, throwing up so much dust that the sun was blocked out for a period of many months. Suppose an asteroid with a diameter of 2.0 km and a mass ofhits the earth with an impact speed of .
a. What is the earth鈥檚 recoil speed after such a collision? (Use a reference frame in which the earth was initially at rest.)
b. What percentage is this of the earth鈥檚 speed around the sun? The earth orbits the sun at a distance of.
Rank in order, from largest to smallest, the momenta to of the objects in FIGURE .
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.
Squids rely on jet propulsion to move around. A kg squid (including the mass of water inside the squid) drifting at 0.40 m/s suddenly ejects kg of water to get itself moving at m/s. If drag is ignored over the small interval of time needed to expel the water (the impulse approximation), what is the water鈥檚 ejection speed relative to the squid?
A rocket in deep space has an empty mass of 150 kg and exhausts the hot gases of burned fuel at 2500 m/s. It is loaded with 600 kg of fuel, which it burns in 30 s. What is the rocket鈥檚 speed 10 s, 20 s, and 30 s after launch?
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