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
Answer: D
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a. it makes it easy to write big or small numbers. b. all astronomical distances are expressed in metric units. c. it makes conversions between units easy. d. all of the above
The sub-atomic particle known as the "neutrino" was originally hypothesized
A) because it was thought that radiant energy is actually a form of energy. B) in order to preserve conservation of electric charge in a certain type of nuclear process. C) in order to preserve Newton's laws in a certain type of nuclear process. D) because it was thought that thermal energy (or heat) is actually a form of energy. E) in order to preserve the law of conservation of energy in a certain type of nuclear process.
Accuracy refers to how close a measurement is to the true value
Indicate whether the statement is true or false
An object is placed 10 cm in front of a diverging lens of focal length -15 cm. The image will be located
A. 6.0 cm behind the lens. B. 0.167 cm in front of the lens. C. 6.0 cm in front of the lens. D. 3.0 cm behind the lens. E. 3.0 cm in front of the lens.