How much energy is in an 89.7 MHz photon of FM-radiation?
a. 2.2 × 10^?33 J
b. 9.5 × 10^?27 J
c. 7.4 × 10^?42 J
d. 5.9 × 10^?26 J
e. 3.7 × 10^?25 J
d
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Main-sequence stars many times the mass of the Sun produce their energy by the set of nuclear reactions called the CNO cycle
a. True b. False Indicate whether the statement is true or false
What do many physicists expect is required to explain why space is "flat" (i.e., that parallel lines stay parallel)?
a. A theory of everything. b. Gravitational waves. c. Dark matter. d. The four forces. e. Proton decay.
Two identical blocks of iron are placed in contact, one at 10°C and the other at 20°C. If the cooler block cools to 5°C and the warmer block warms to 25°C, this would violate the
A) first law of thermodynamics. B) second law of thermodynamics. C) third law of thermodynamics. D) none of the above
The net work done in accelerating a propeller from rest to an angular velocity of 200 rad/s is 3 000 J. What is the moment of inertia of the propeller?