It takes approximately ___________ seconds for a particle moving at the speed of light to travel the 150 million kilometers from the Sun to Earth
Fill in the blank(s) with correct word
500
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An earthquake of magnitude ______________ on the Richter scale is the smallest that can be felt by humans
Fill in the blank(s) with correct word
Neutron stars were first discovered in the 1930's
Indicate whether the statement is true or false
Force on a Moving Charge: Three particles travel through a region of space where the magnetic field is out of the page, as shown in the figure. What are the signs of the charges of these three particles?
A. 1 is neutral, 2 is negative, and 3 is positive. B. 1 is neutral, 2 is positive, and 3 is negative. C. 1 is positive, 2 is neutral, and 3 is negative. D. 1 is positive, 2 is negative, and 3 is neutral. E. 1 is negative, 2 is neutral, and 3 is positive.
Which of the following statements about the Moon is true?
A) The Moon goes through a cycle of phases because it always has the same side facing Earth. B) If you see a full Moon from North America, someone in South America would see a new Moon. C) The Moon's distance from Earth varies during its orbit. D) The Moon is visible only at night. E) The side of the Moon facing away from Earth is in perpetual darkness.