Subsurface soil that remains permanently frozen is called ______________
Fill in the blank(s) with correct word
permafrost
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If you were to unscrew bulb A from its socket (effectively removing it from the circuit and leaving a gap in its place), bulb B would
A. get brighter.
B. become dimmer.
C. remain at the same brightness.
D. go out.
Photon Energy: Two sources emit beams of microwaves. The microwaves from source A have a frequency of 10 GHz, and the ones from source B have a frequency of 20 GHz. This is all we know about the two beams. Which of the following statements about these beams are correct? (There could be more than one correct choice.)
A. Beam B carries twice as many photons per second as beam A. B. A photon in beam B has twice the energy of a photon in beam A. C. The intensity of beam B is twice as great as the intensity of beam A. D. A photon in beam B has the same energy as a photon in beam A. E. None of these statements are true.
When liquids change to a solids, they
A) absorb energy. B) release energy. C) both of these D) neither of these
A 310-g air track cart is traveling at 1.25 m/s and a 260-g cart traveling in the opposite direction at 1.33 m/s. What is the speed of the center of mass of the two carts?
A) 2.80 m/s B) 0.0732 m/s C) 0.131 m/s D) 1.47 m/s E) 1.29 m/s