Acceleration has dimension 
Use dimensional analysis to determine the ratio of accelerations for car A to car B, if car A travels a given distance in half the time required by car B.
A. 2
B. 4
C. 
D. 1/4
E. 1/2
F. 
B. 4
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The eye focuses by
A. moving the lens. B. moving the retina. C. moving both the lens and the retina. D. changing the focal length of the lens. E. changing the index of refraction of the vitreous fluid.
For a body emitting blackbody radiation, the total power emitted is proportional to the 4th power of the body's absolute temperature: (T in kelvins) and the wavelength of the emitted EM radiation that has the highest intensity is inversely proportional to the body's absolute temperature according to: ( in meters, T in kelvins) Assume an object is emitting blackbody radiation. As the temperature
of a body increases, a. the body gets brighter. b. the color of the body shifts from red to white. c. the wavelength of the most intense light decreases. d. the frequency of the most intense light increases. e. all the above.
Simple Pendulum: What is the length of a simple pendulum with a period of 2.0 s?
A. 20 m B. 0.99 m C. 1.2 m D. 1.6 m E. 0.87 m
Water flows over a waterfall 20. m high, at the rate of 4.0 × 104 kg/s. If this water powers an electric generator with a 40% efficiency, how many watts of electric power can be supplied?
What will be an ideal response?