Find the net work done by friction on a box that moves in a complete circle of radius on a uniform horizontal floor. The coefficient of kinetic friction between the floor and the box is 0.25, and the box weighs 65N
A) 190 J
B) 0 J
C) 1,800 J
D) 370 J
A
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Why couldn't you stand on the Sun's surface?
A) The Sun has no surface at all...the photosphere is an illusion. B) You could stand on the surface. C) The Sun doesn't have a solid surface. D) The Sun's surface is too highly magnetized for anything to survive there. E) You could stand on it, if a sufficiently protective spacesuit could be designed.
The support force on a 30-kg dog sleeping on the floor is
A) less than 300 N. B) about 300 N. C) more than 300 N. D) nonexistent while asleep.
A cube of water ice (? = 0.917 × 103 kg/m3) is placed in mercury (? = 13.6 × 103 kg/m3), which is liquid at 0° Celsius. If we ignore any possible melting of the ice cube and problems with the surface tension of mercury, the fraction of the ice cube that floats above the surface of the mercury is
A. 0.067 4. B. 0.073 5. C. 0.926. D. 0.933. E. 1.00.
The number of sunspot cycles in a solar magnetic cycle is ___________
Fill in the blank(s) with correct word