In the late 18th century, two astronomers, both with the last name of _______________, were the first to attempt to map the shape of the galaxy
Fill in the blank(s) with correct word
Herschel
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Radio waves, of sufficient frequency, pass through which of the following ion layers?
a. C b. D c. E d. F
A 3.0-kg mass is dropped from the edge of a 50-m tall building with an initial speed of zero. The mass strikes the ground with a downward velocity of 25 m/s. Find the change in mechanical energy of the mass caused by air resistance between the point where it is dropped and the point where it strikes the ground?
a. -0.46 kJ b. -0.53 kJ c. -0.61 kJ d. -0.38 kJ e. -0.81 kJ
General Questions: A person who normally weighs 700 N is riding in a rather swift elevator that is moving at a constant speed of 9.8 m/s. If this person is standing on a bathroom scale inside the elevator, what would the scale read?
A. more than 700 N B. less than 700 N C. 700 N D. It could be more or less than 700 N, depending on whether the elevator is going up or down.
Pluto is smaller than many moons in the solar system
Indicate whether the statement is true or false