Which of the statements below is part of both the Ptolemaic and Copernican models?
A) The Earth orbits the Sun once a year.
B) The Sun lies in the center of the Cosmos.
C) The Moon orbits the Earth once a month.
D) Epicycles are needed to explain retrograde motion of the planets.
E) Venus' epicycle must always lie between us and the Sun.
C
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A skydiver has bailed out of his airplane at a height of 3000 m. The mass of the skydiver and his parachute is 80 kg. What is the drag (force of air resistance) when he reaches terminal speed?
A. 120 N B. 360 N C. 784 D. 750 N
What is the total energy of a proton moving at a speed of 2.4 × 10^8 m/s? (proton mass is 1.67 × 10^?27 kg and c = 3.00 × 10^8 m/s)
a. 1.91E–10 J b. 1.77E–10 J c. 2.51E–10 J d. 2.44E–10 J e. 9.02E–11 J
Monochromatic light is incident on a metal surface and electrons are ejected. If the intensity of the light is increased, what will happen to the ejection rate and maximum energy of the electrons?
A) Greater rate; same maximum energy. B) Same rate; greater maximum energy. C) Greater rate; greater maximum energy. D) Same rate; same maximum energy.
The binding energy of the hydrogen atom in its ground state is -13.6 eV. What is the energy when it is in the n = 5 state?
A) 0.544 eV B) 2.72 eV C) -2.72 eV D) -0.544 eV E) -68 eV