After a skydiver reaches terminal velocity,
a. the force of gravity no longer performs work on the skydiver.
b. work performed by the force of gravity is converted into gravitational potential energy.
c. gravitational potential energy is no longer available to the system of the skydiver plus the Earth.
d. gravitational potential energy is converted into thermal energy.
e. thermal energy is converted into gravitational potential energy.
d
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Contrast this impression with the Cosmological Principle and explain why a simple-minded interpretation of the Hubble expansion is incorrect.
One of the harmonics of a string fixed at both ends has a frequency of 52.2 Hz and the next higher harmonic has a frequency of 60.9 Hz. What is the fundamental frequency of the string?
A) 26.1 Hz B) 8.7 Hz C) 4.35 Hz D) 30.4 Hz E) 17.4 Hz
If ? = 4, how many possible values can the magnetic quantum number m? have?
A) 4 B) 10 C) 5 D) 9 E) 3 F) 8
In ultrasound the wavelength of the sound is much smaller than in normal sound
Indicate whether the statement is true or false