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Chapter 5: Q6. (page 130)
Sometimes it is said that water is removed from clothes in the spin dryer by centrifugal force throwing the water outward. Is this correct? Discuss.
The water isn’t removed from clothes by the concept of centrifugal force in the spin dryer.
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A jet pilot takes his aircraft in a vertical loop (Fig. 5–38).
(a) If the jet is moving at a speed ofat the lowest point of the loop, determine the minimum radius of the circle so that the centripetal acceleration at the lowest point does not exceed 6.0 g’s. (b) Calculate the 78-kg pilot’s effective weight (the force with which the seat pushes up on him) at the bottom of the circle, and (c) at the top of the circle (assume the same speed).
FIGURE 5-38 Problem 12.
What is the magnitude of the acceleration of a speck of clay on the edge of a potter’s wheel turning at 45 rpm (revolutions per minute) if the wheel’s diameter is 35 cm?
Calculate the effective value of g, the acceleration of gravity, at (a) 6400 m, and (b) 6400 km, above the Earth’s surface.
A hypothetical planet has a radius 2.0 times that of Earth, but has the same mass. What is the acceleration due to gravity near its surface?
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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