In the early universe, the electromagnetic and strong nuclear forces were joined together to make the electrostrong force
a. True
b. False
Indicate whether the statement is true or false
False
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What is the difference between weather and climate?
A) Weather refers to short-term changes in wind, rain, and temperature; climate refers to the long-term average of weather. B) Weather refers to atmospheric conditions in the troposphere; climate refers to atmospheric conditions in the stratosphere. C) Weather is something that we can control, and climate is not. D) Weather refers to small storms; climate refers to large storms.
One of the curators at the art museum is tilting a large cylinder backward. At what angle ? will the cylinder of height h and radius r be in unstable equilibrium?
A.
.B.
.C.
.D.
.E.
.A hydrogen atom is excited to the n = 10 stated. It then decays to the n = 4 state by emitting a photon which is detected in a photographic plate
What is the frequency of the detected photon? The lowest level energy state of hydrogen is -13.6 eV. (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 3.46 × 1014 Hz B) 0.865 × 1014 Hz C) 1.27 × 1014 Hz D) 4.05 × 1014 Hz E) 1.73 × 1014 Hz
A mass of 0.150 kg is attached to a spring with a force constant of 3.58 N/m and undergoes simple harmonic oscillations with an amplitude of 7.50 cm. What is the total mechanical energy of the system?
A) 0.0201 J B) 0.0101 J C) 0.269 J D) 0.134 J E) 0 J