When starting from rest at the bottom of a straight road with constant upward slope, Joan bicycles to the top 50.0 s ahead of Sally, whose travel time is 5.00 minutes. What is the ratio of Joan's acceleration to Sally's acceleration?
a. 0.694
b. 0.833
c. 1.20
d. 1.44
e. 6.00
D
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Which of the following is true of Venus?
A) It is the smallest planet in the Solar System. B) It is the brightest natural object in the sky. C) It is about the same size as Earth. D) It is a self-luminous body that generates its own energy.
Which statement is true?
A. Some electromagnetic waves will pass through walls that light cannot penetrate B. Electromagnetic waves can't travel in perfect vacuum C. Radio waves in the AM band are not electromagnetic waves D. Speed of light in air is lower than in glass E. In air light travels much faster than radiation from a microwave oven
Aluminum wire has resistivity of 0.286 x 10^-7 ohm-m where resistivity is defined as ohmarea/length. Determine the temperature distribution through an aluminum wire of ¼ inch diameter carrying 200 amperes of current if it is surrounded by air at 80ºF and with a convective heat transfer coefficient of 200 Btu/hr?ft^2?ºF.
What will be an ideal response?
Suppose that a sound source is emitting waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency of the sound will be
A) unchanged. B) twice as great. C) half as great. D) one-fourth as great.