Chapter 7: Q56P (page 170)
Assume that your proportions are the same as those in Table 7–1, and calculate the mass of one of your legs.
The mass of one of your legs is \(10.89\;{\rm{kg}}\).
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A 0.25-kg skeet (clay target) is fired at an angle of 28° to the horizontal with a speed of\(25\;{\rm{m/s}}\)(Fig. 7–45). When it reaches the maximum height, h, it is hit from below by a 15-g pellet traveling vertically upward at a speed of\(230\;{\rm{m/s}}\).The pellet is embedded in the skeet. (a) How much higher,\(h'\)does the skeet go up? (b) How much extra distance, does the skeet travel because of the collision?
A (lightweight) pallet has a load of ten identical cases of tomato paste (see Fig. 7–39), each of which is a cube of length \(l\). Find the center of gravity in the horizontal plane, so that the crane operator can pick up the load without tipping it.
FIGURE 7-39
Problem 53.
Is it possible for an object to receive a larger impulse from a small force than from a large force? Explain.
(II) Calculate the force exerted on a rocket when the propelling gases are being expelled at a rate of 1300 kg/s with a speed of \(4.5 \times {10^4}\;{\rm{m/s}}\).
A huge balloon and its gondola, of mass M, are in the air and stationary with respect to the ground. A passenger, of mass m, then climbs out and slides down a rope with speed v, measured with respect to the balloon. With what speed and direction (relative to Earth) does the balloon then move? What happens if the passenger stops?
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