What date is the autumnal equinox for the Southern hemisphere?
a. December 21
b. September 22
c. June 22
d. March 20
e. December 25
d
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Consider two steel rods, A and B. B has three times the area and twice the length of A, so Young's modulus for B will be what factor times Young's modulus for A?
a. 3.0 b. 0.5 c. 1.5 d. 1.0
Two cars are traveling around identical circular racetracks. Car A travels at a constant speed of 20 m/s. Car B starts at rest and speeds up with constant tangential acceleration until its speed is 40 m/s. When car B has the same (tangential) velocity as car A, it is always true that:
A. it is passing car A. B. it has the same linear (tangential) acceleration as car A. C. it has the same centripetal acceleration as car A. D. it has the same total acceleration as car A. E. it has traveled farther than car A since starting.
What is the period of revolution of a planet in circular orbit around a star of 4.0 solar masses if it is at a distance from the star equal to that of the Earth from the Sun?