A 60.0-kg mass person wishes to push a 120-kg mass box across a level floor
The coefficient of static friction between the person's shoes and the floor is 0.700. What is the maximum coefficient of static friction between the box and the floor such that the person can push horizontally on the box and cause it to start moving?
A) 0.333
B) 0.500
C) 0.350
D) 0.667
E) 0.700
C
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in front of a concave lens of focal length ?f that is located at 
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According to the universal law of gravitation, if you triple the distance between two objects, then the gravitational force between them
A) increases by a factor of 9. B) decreases by a factor of 9. C) decreases by a factor of 3. D) increases by a factor of 3.
The SI unit of length, the meter, is currently defined
A) as 10-7 of the distance from the North Pole to the equator along a meridian running through Paris. B) as the length of the path traveled by light in a vacuum during 1/299792485 s. C) by the President's foot. D) as the distance between two marks on a metal bar make of a platinum-iridium alloy kept at the National Bureau of Standards. E) 1,553,164.1 wavelengths of red cadmium light in dry air at 25°C.
Which of the following best characterizes electrical insulators?
a. charges on the surface don't move b. high tensile strength c. electric charges move freely d. good heat conductors