A light-year is the distance that light travels in one year. The speed of light is 3.00 108 m/s. How many miles are there in one light-year? (1 mi = 1609 m, 1 y = 365 d)
A) 9.46 1015 mi B) 9.46 1012 mi C) 5.88 1012 mi D) 5.88 1015 mi
Question 2
Which of the following best describes the meaning of force?
A) A body's force is the tendency of that body to continue moving once it is started moving.
B) A force is a change in velocity.
C) The force of a moving body is the distance the body travels divided by the time it takes to travel that distance.
D) A body exerts a force on another body when the first body causes the second body to accelerate.
E) The force that a body has is the amount of work that the body can do.
Development of the light microscope
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