In a grandfather clock, the pendulum measures the time elapsed. A grandfather clock is gaining time. Should you shorten or lengthen the pendulum?
What will be an ideal response?
You should lengthen the pendulum to make its period longer.
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A Boeing-737 airliner has a mass of 20 500 kg. The total area of the wings is 105 m2 . What must be the pressure difference between the top and bottom of the wings to keep the airplane up?
a. 1.91E+3 Pa b. 1.99E+1 Pa c. 1.95E+2 Pa d. 1.92E+3 Pa e. 1.81E+3 Pa
__________ in an x-ray spectrum of an atom occurs because of rapid deceleration of the bombarding electrons
Fill in the blank(s) with correct word
Star A has twice the parallax as Star B. Star A is
A) twice as far as Star B. B) four times as far as Star B. C) eight times as far as Star B. D) half as far as Star B. E) one fourth as far as Star B.
Aluminum Rod#1 has a length L and a diameter d. Aluminum Rod#2 has a length 2L and a diameter 2d. If Rod#1 is under tension T and Rod#2 is under tension 2T, how do the changes in length of the two rods compare?
A. They are the same. B. Rod#1 has double the change in length that Rod#2 has. C. Rod#2 has double the change in length that Rod#1 has. D. Rod#1 has quadruple the change in length that Rod#2 has. E. Rod#2 has quadruple the change in length that Rod#1 has.