In problems involving a slope or inclined plane, the force due to gravity is always perpendicular to the slope or the plane
Indicate whether the statement is true or false
FALSE
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The Sun's path, as viewed from the equator, is highest in the sky on
A) the winter solstice. B) the spring and fall equinoxes. C) the summer solstice. D) the day when Earth is closest to the Sun.
Careful observations of the sky by ancient cultures served the practical purpose of
A) keeping track of time B) improving night vision C) religious worship D) keeping track of the changing position of the Earth around the Sun
A 4-mol ideal gas system undergoes an adiabatic process where it expands and does 28 J of work on its environment. How much heat is received by the system?
a. -20 J c. +28 J b. zero d. +7 J
A fixed focus camera has a focal length of 35.0 mm. How far must the lens be moved in order to change focus from an object that is 20.0 m away to one that is 3.0 m away?
A. 0.34 mm B. 0.41 mm C. 0.35 mm D. 0.47 mm