Rank the potential energies of the four systems of particles shown in Figure OQ25.5 from largest to smallest. Include equalities if appropriate
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The best way to reduce your radiation dose from a Co-60 gamma emitting source is to _______
a. reduce the temperature of the source b. move twice as far away c. spend half the time near the source d. double the thickness of wood between you and the source e. nonsense! You cannot change the potential dose
A body of mass 5.0 kg is suspended by a spring which stretches 10 cm when the mass is attached. It is then displaced downward an additional 5.0 cm and released. Its position as a function of time is approximately
A. y = ?0.10 sin 9.9t. B. y = 0.10 cos 9.9t. C. y = ?0.10 cos (9.9t + 0.1). D. y = 0.10 sin (9.9t + 5). E. y = ?0.05 cos 9.9t.
We have sent several spacecraft on trajectories that will ultimately take them into interstellar space (including Pioneer 10 and 11, Voyager 1 and 2, New Horizons). How long will it take these spacecraft to travel as far as the nearest stars?
A) tens of thousands of years B) a few hundred years C) a few decades D) never, because they will rust and fall apart E) about a thousand years
If you see Polaris directly overhead, you must be very close to
A) the equator. B) the South Pole. C) the Tropic of Cancer. D) the North Pole.