Consider the standing wave on a guitar string and the sound wave generated by the string as a result of this vibration. What do these two waves have in common? (There may be more than one correct choice.)
A) They have the same wavelength.
B) They have the same speed.
C) They have the same frequency.
D) They have the same amplitude.
E) They have the same period.
C, E
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Which kind of telescope is shown?
a. infrared b. radio c. optical d. ultraviolet
If a proton with mass 1.67 × 10^?27 kg moves in an accelerator such that its total energy is three times its rest energy, what is its speed? (c = 3.00 × 10^8 m/s)
a. 2.83 × 10^8 m/s b. 2.45 × 10^8 m/s c. 2.00 × 10^8 m/s d. 1.00 × 10^8 m/s e. 1.54 × 10^8 m/s
Which of the following describes a star with a hydrogen-burning shell and an inert helium core?
A) It is a red giant that grows in luminosity until it dies in a planetary nebula. B) It is a subgiant that gradually grows dimmer as its hydrogen-burning shell expands and cools. C) It is a subgiant that grows in luminosity until helium fusion begins in the central core. D) It is what is known as a helium-burning star, which has both helium fusion in its core and hydrogen fusion in a shell.
If one were told the object's initial velocity then one could calculate the work done by using the equations for constant acceleration to find the distance traveled. When we say work is done against a force, we mean the force does
a. none of the work c. negative work b. positive work d. zero work