A(n) ____________________ is used to measure the brightness and color of stars
Fill in the blank(s) with correct word
photometer
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A 2.5-kg object falls vertically downward in a viscous medium at a constant speed of 2.5 m/s. How much work is done by the force the viscous medium exerts on the object as it falls 80 cm?
A. +2.0 J B. +20 J C. ?2.0 J D. ?20 J E. +40 J
Two motorcycle stunt drivers, one light and the other much heavier, ride their motorcycles up and off an inclined ramp at identical speeds
They both rise in the air and land downrange. Neglecting air resistance, the one to attain the greatest height and greatest range is the A) light driver. B) heavy driver. C) both the same
Dark matter is purely hypothetical, because we have no way of detecting its presence
Indicate whether the statement is true or false
A car, a train, a bicycle, and a skateboard are traveling at the same speed. Which object has the greatest kinetic energy?
A) Car B) Bicycle C) Train D) Skateboard