As an artificial radio source, the spinning Earth would have a period of about a day
Indicate whether the statement is true or false
TRUE
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According to the universal law of gravitation, if the masses of both attracting objects double, then the gravitational force between them will
A) not change at all. B) increase by a factor of 2. C) decrease by a factor of 2. D) increase by a factor of 4. E) decrease by a factor of 4.
A box of mass m is pressed against (but is not attached to) an ideal spring of force constant k and negligible mass, compressing the spring a distance x
After it is released, the box slides up a frictionless incline as shown in the figure and eventually stops. If we repeat this experiment with a box of mass 2m A) the lighter box will go twice as high up the incline as the heavier box. B) just as it moves free of the spring, the lighter box will be moving twice as fast as the heavier box. C) both boxes will have the same speed just as they move free of the spring. D) both boxes will reach the same maximum height on the incline. E) just as it moves free of the spring, the heavier box will have twice as much kinetic energy as the lighter box.
In a grandfather clock, the pendulum measures the time elapsed. A grandfather clock is gaining time. Should you shorten or lengthen the pendulum?
What will be an ideal response?
A little known fact is that both Robinson Crusoe and Friday wore eyeglasses. As it so happens, Robinson Crusoe was farsighted while Friday was nearsighted
Whose eyeglasses did they use whenever they wanted to start a fire by focusing the sun's rays? A) Robinson Crusoe's B) Friday's C) Both would work equally well. D) Both actually worked, but Friday's was a little bit better. E) Neither's worked, but fortunately they were in possession of matches.