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Chapter 7: 2P (page 170)
If a Saturn V rocket with an Apollo spacecraft attached had a combined mass of and reached a speed of , how much kinetic energy would it then have?
The kinetic energy of a Saturn V rocket with an attached Apollo spacecraft is .
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In Fig. 7-20 , a greased pig has a choice of three frictionless slides along which to slide to the ground. Rank the slides according to how much work the gravitational force does on the pig during the descent, greatest first
Figure 7 -42 shows a cold package of hot dogs sliding rightward across a frictionless floor through a distance while three forces act on the package. Two of them are horizontal and have the magnitudes and; the third is angled down by and has the magnitude. (a) For the 20.0 cm displacement, what is the net work done on the package by the three applied forces, the gravitational force on the package, and the normal force on the package? (b) If the package has a mass of 2.0 Kg and an initial kinetic energy of 0, what is its speed at the end of the displacement?
A 3.0 kg body is at rest on a frictionless horizontal air track when a constant horizontal force acting in the positive direction of an x axis along the track is applied to the body. A stroboscopic graph of the position of the body as it slides to the right is shown in Fig. 7-25. The force is applied to the body at t=0, and the graph records the position of the body at 0.50 s intervals. How much work is done on the body by the applied force between t=0 and t=2.0 s ?
A block is dropped onto a relaxed vertical spring that has a spring constant of (Fig.).The block becomes attached to the spring and compresses the springbefore momentarily stopping. While the spring is being compressed, what work is done on the block by (a) the gravitational force on it and (b) the spring force? (c) What is the speed of the block just before it hits the spring? (Assume that friction is negligible.) (d) If the speed at impact is doubled, what is the maximum compression of the spring?
To push a 25.0 kg crate up a frictionless incline, angled at to the horizontal, a worker exerts a force of 209 N parallel to the incline. As the crate slides1.50 m, how much work is done on the crate by (a) the worker鈥檚 applied force, (b) the gravitational force on the crate, and (c) the normal force exerted by the incline on the crate? (d) What is the total work done on the crate?
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