How much energy is in a 63 kHz photon of AM-radiation?
a. 1.0 × 10^?38 J
b. 6.6 × 10^?30 J
c. 4.2 × 10^?29 J
d. 3.1 × 10^?30 J
e. 13 × 10^?29 J
c
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Recoil is noticeable if we throw a heavy ball while standing on roller skates. If instead we go through the motions of throwing the ball but hold onto it, our net recoil will be
A) zero. B) the same as before. C) small, but noticeable.
An astronaut drops a marble on the surface of Mars and observes that it takes 1.02 s for the marble to fall 2.00 m. She also knows that the radius of Mars is 3.39 × 106 m and that G = 6.67 x 10-11 N•m2/kg2
From this information, she can conclude that the mass of Mars is A) 3.30 × 1023 kg. B) 6.62 × 1023 kg. C) 4.62 × 1023 kg. D) 8.09 × 1023 kg. E) 9.95 × 1023 kg.
Like dark matter, dark energy will also retard the expansion of the universe
Indicate whether the statement is true or false
The basic energy resource that fueled the "industrial revolution" was a form of
A) nuclear energy. B) thermal energy. C) gravitational energy. D) chemical energy. E) radiant energy.