Doug hits a hockey puck, giving it an initial velocity of 6.0 m/s. If the coefficient of kinetic friction between ice and puck is 0.20, how far will the puck slide before stopping?
a. 14 m
b. 19 m
c. 9 m
d. 11 m
e. 24 m
c
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Which of the following statements about thermal radiation is always true?
A) A hot object emits more x-rays than a cool object. B) A hot object emits more radio waves than a cool object. C) A hot object emits more total radiation than a cool object. D) A hot object emits more total radiation per unit surface area than a cool object. E) A hot object emits less total radiation than a cool object.
Detect a star giving off more ultraviolet light than green light. What property of thestar can I estimate with this information?
a) Its chemical composition b) Its temperature c) Its density d) Its age e) Its distance from Earth
The electric field in a region of space is given by Ex = (3.0x) N/C, Ey = Ez = 0, where x is in m. Points A and B are on the x axis at xA = 3.0 m and xB = 5.0 m. Determine the potential difference VB?VA.
A. ?24 V B. +24 V C. ?18 V D. +30 V E. ?6.0 V
Consider two planets in space that gravitationally attract each other. If the masses of both planets are doubled, and the distance between them doesn't change, then the force between them is
A) one-quarter. B) half as much. C) twice as much. D) four times as much. E) none of the above