A cylindrical tank (height h, radius r) is full to the brim of water and its top is open to the outside air. What expression describes the speed of fluid flowing out of a hole that is opened up at height h’ above the bottom of the tank?
a. 
b. 
c. 
d. 
d.
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A star's luminosity depends only on the star's
a. distance and diameter. b. temperature and distance. c. distance. d. temperature and diameter. e. apparent magnitude.
Uranus' rotation axis is tipped over 98 degrees, so its magnetosphere is tipped over the same amount
Indicate whether the statement is true or false
A 20.0 kg box slides down a 12.0 m long incline at an angle of 30.0 degrees with the horizontal. A force of 50.0 N is applied to the box in the upward direction. The applied force F makes an angle of 0.00 to the incline. If the incline has a coefficient of kinetic friction of 0.000, then the increase in the kinetic energy of the box is
A. 620 J. B. 576 J. C. 542 J. D. 500 J. E. 475 J.
Uniform Circular Motion: A future use of space stations may be to provide hospitals for severely burned persons. It is very painful for a badly burned person on Earth to lie in bed. In a space station, the effect of gravity can be reduced or even eliminated. How long should each rotation take for a doughnut-shaped hospital of 200-m radius so that persons on the outer perimeter would experience 1/10 the normal gravity of Earth?
A. 91 min B. 8.7 min C. 4.6 min D. 1.5 min E. 0.011 min