When a planet retrogrades, it appears to move westward for weeks at a time
Indicate whether the statement is true or false
TRUE
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Galileo's observations of the phases of ________ could not be explained by Ptolemy's epicyclic model
Fill in the blank(s) with correct word
Suppose you drop a 10-pound weight and a 5-pound weight on the Moon, both from the same height at the same time. What will happen?
A) Both weights will float freely, since everything is weightless on the Moon. B) Both will hit the ground at the same time. C) The 10-pound weight will hit the ground before the 5-pound weight. D) The 5-pound weight will hit the ground before the 10-pound weight.
Combining two sounds of equal intensity will give a sound level ___________ than the sound level due to just one of them
a. twice as loud b. 3 dB higher c. 10 dB higher d. 2 dB higher
Photons of visible wavelengths are shone on a surface starting with one end of the spectrum and gradually proceeding to the other end. When 589 nm is reached, electrons start coming out of the surface. Which of the following is true?
A) The spectrum scan started at the blue end. B) Electrons would not be ejected at this wavelength for any material. C) The spectrum scan started at the red end. D) The spectrum scan could have started at either end. E) none of the above