An object is in free fall as soon as it is released, whether it is dropped from rest, thrown downward, or thrown upward
Indicate whether the statement is true or false
TRUE
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According to what we now know from Newton's laws, which of the following best explains why Kepler's second law is true?
A) A planet's angular momentum must be conserved as it moves around its orbit. B) Orbits must be elliptical in shape. C) Gravity is an inverse cube law. D) This effect happens because of the influence of other planets on a particular planet's orbit.
The shorter the wavelength of light, the higher its frequency
Indicate whether the statement is true or false
The Moon's reflected image in a lake often appears as a vertical column when the water is
A) perfectly still. B) slightly rough. C) very rough, churning with waves.
Which of the following is an example of a longitudinal wave?
a. sound wave in air c. both a and b b. wave traveling in a string d. neither a nor b