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Chapter 1: Q8DQ (page 228)
Fractured Physics. People often call their electric bill a power bill, yet the quantity on which the bill is based is expressed in kilowatt-hours. What are people really being billed for?
The people are really paid for the electric bill.
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Planet Vulcan.Suppose that a planet were discovered between the sun and Mercury, with a circular orbit of radius equal to of the average orbit radius of Mercury. What would be the orbital period of such a planet? (Such a planet was once postulated, in part to explain the precession of Mercury鈥檚 orbit. It was even given the name Vulcan, although we now have no evidence that it actually exists. Mercury鈥檚 precession has been explained by general relativity.)
Neutron stars, such as the one at the center of the Crab Nebula, have about the same mass as our sun but have a much smaller diameter. If you weigh on the earth, what would you weigh at the surface of a neutron star that has the same mass as our sun and a diameter of ?
A small rock is thrown vertically upward with a speed of22.0 m/s from the edge of the roof of a 30.0-m-tall building. Therock doesn鈥檛 hit the building on its way back down and lands onthe street below. Ignore air resistance. (a) What is the speed of therock just before it hits the street? (b) How much time elapses fromwhen the rock is thrown until it hits the street?
A rather ordinary middle-aged man is in the hospitalfor a routine checkup. The nurse writes 鈥�200鈥� on the patient鈥檚medical chart but forgets to include the units. Which of these quantities could the 200 plausibly represent? The patient鈥檚 (a) mass in kilograms; (b) height in meters; (c) height in centimeters;(d) height in millimeters; (e) age in months
A car and a truck start from rest at the same instant, with the car initially at some distance behind the truck. The truck has a constant acceleration of, and the car has an acceleration of. The car overtakes the truck after the truck has moved. (a) How much time does it take the car to overtake the truck? (b) How far was the car behind the truck initially? (c) What is the speed of each when they are abreast? (d) On a single graph, sketch the position of each vehicle as a function of time. Takeat the initial location of the truck.
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