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Chapter 4: Q22. (page 99)
What would your bathroom scale read if you weighed yourself on an inclined plane? Assume the mechanism functions properly, even at an angle.
The obtained reading on the bathroom scale is .
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According to a simplified model of a mammalian heart, at each pulse approximately 20 g of blood is accelerated fromtoduring a period of 0.10 s. What is the magnitude of the force exerted by the heart muscle?
(a) A box sits at rest on a rough 33掳 inclined plane. Draw the free-body diagram, showing all the forces acting on the box. (b) How would the diagram change if the box were sliding down the plane? (c) How would it change if the box were sliding up the plane after an initial shove?
What average force is required to stop a 950-kg car in 8.0 s if the car is traveling at 95 km/h?
A bear sling (Fig. 4-40) is used in some national parks for placing backpackers鈥� food out of the reach of bears. As a backpacker raises the pack by pulling down on the rope, the force F needed
(a) decreases as the pack rises until the rope is straight across.
(b) doesn鈥檛 change.
(c) increases until the rope is straight.
(d) increases, but the rope always sags where the pack hangs.
A person jumps from the roof of a house 2.8 m high. When he strikes the ground below, he bends his knees so that his torso decelerates over an approximate distance of 0.70 m. If the mass of his torso (excluding legs) is 42 kg, find (a) his velocity just before his feet strike the ground, and (b) the average force exerted on his torso by his legs during deceleration.
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