Why does the Moon show phases in the course of a month?
Clouds get in the way of the Moon's light and cover up parts of it.
The Moon glows from the inside and its various continents glow different amounts.
The angle the Moon makes with the Sun changes and we see differing amounts of reflected sunlight.
The Earth's shadow falls on the Moon to different degrees as the Moon goes around.
The angle the Moon makes with the Sun changes and we see differing amounts of reflected sunlight.
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Kinetic Energy: What is the minimum energy needed to change the speed of a 1600-kg sport utility vehicle from 15.0 m/s to 40.0 m/s?
A. 1.10 MJ B. 10.0 kJ C. 20.0 kJ D. 40.0 kJ E. 0.960 MJ
A cart of weight 60 N is accelerated across a level surface at 0.15 m/s2 . What net force acts on the cart? (g = 9.8 m/s2)
a. 0.92 N c. 3.0 N b. 0.31 N d. 4.5 N
Atmospheric pressure at an altitude of 10,000 m is exactly half of what it is at 5,000 m
a. True b. False Indicate whether the statement is true or false
What is meant by a hypothesis?
A) a natural phenomenon that requires explanation B) an explanation for a phenomenon that makes a prediction C) a tentative understanding of a natural phenomenon D) a pseudoscientific idea E) a historical theory that has been proved inaccurate