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Chapter 1: Q8DQ (page 159)
A block rests on an inclined plane with enough friction to prevent it from sliding down. To start the block moving is it easier to push it up the plane or down the plane? Why?
To start the block moving, it is easier to push it down the plane.
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For the hydraulic lift shown in Fig. 12.7, what must be the ratio of the diameter of the vessel at the car to the diameter of the vessel where the force F1 is applied so that a 1520-kg car can be lifted with a force F1 of just 125 N?
A rubber hose is attached to a funnel, and the free end is bent around to point upward. When water is poured into the funnel, it rises in the hose to the same level as in the funnel, even though the funnel has a lot more water in it than the hose does. Why? What supports the extra weight of the water in the funnel?
A 950-kg cylindrical can buoy floats vertically in seawater. The diameter of the buoy is 0.900 m. Calculate the additional distance the buoy will sink when an 80.0-kg man stands on top of it.
In an experiment, a shearwater (a seabird) was taken from its nest, flown 5150 km away, and released. The bird found its way back to its nest 13.5 days after release. If we place the origin at the nest and extend the +x-axis to the release point, what was the bird’s average velocity in (a) for the return flight and (b) for the whole episode, from leaving the nest to returning?
How many years older will you be 1.00 gigasecond from now? (Assume a 365-day year.)
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