The direction of the acceleration of an object moving in a circle at constant speed is
a. changing, but pointing in a predictable direction.
b. constant and pointing in only one direction.
c. constant and pointing in two directions.
d. none of these
a
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The source of electrons that illuminate a common lamp in your home is
A) the power company. B) the electrical outlet. C) atoms in the lamp filament. D) the wires leading to the lamp. E) the source voltage.
If the change in wavelength is less than zero, then the radial velocity tells you that the star is moving _______________ you
a. parallel to b. away from c. towards d. in circles around
A__________is a stellar object with such low mass that it cannot raise its central temperature high enough to sustain hydrogen fusion
A) T Tauri star B) Herbig-Haro object C) brown dwarf D) protostar
A car goes around a curve at a constant speed. What is the direction of the net force on the car?
A) toward the curve's center B) away from the curve's center C) toward the front of the car D) toward the back of the car E) the net force is zero