Chapter 5: Q1. (page 130)
How many "accelerators" do you have in your car? There are at least three controls in the car which can be used to cause the car to accelerate. What are they? What accelerations do they produce?
There are three accelerators used in car, the accelerator pedal, the brake pedal and the steering wheel.
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Calculate the acceleration due to gravity on the Moon, which has radiusand mass?
Astronauts who spend long periods in outer space could be adversely affected by weightlessness. One way to simulate gravity is to shape the spaceship-like a cylindrical shell that rotates, with the astronauts walking on the inside surface (Fig. 5–33). Explain how this simulates gravity. Consider (a) how objects fall, (b) the force we feel on our feet, and (c) any other aspects of gravity you can think of.
Every few hundred years most of the planets line up on the same side of the Sun. Calculate the total force on the Earth due to Venus, Jupiter, and Saturn, assuming all four planets are in a line, Fig. 5–44. The masses are,,and the mean distances of the four planets from the Sun are 108, 150, 778, and 1430 million km. What fraction of the Sun’s force on the Earth is this?
Tarzan plans to cross a gorge by swinging in an arc from a hanging vine (Fig. 5–42). If his arms are capable of exerting a force of 1150 N on the vine, what is the maximum speed he can tolerate at the lowest point of his swing? His mass is 78 kg and the vine is 4.7 m long.
FIGURE 5-42. Problem 18
A particle revolves in a horizontal circle of radius 1.95 m. At a particular instant, its acceleration is 1.05, in a direction that makes an angle of to its direction of motion. Determine its speed (a) at this moment, and (b) 2.00 s later, assuming constant tangential acceleration.
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