Do you remember how we do measure distances to stars?
A: inverse square law
B: p-p chain
C: parallax
D: measure sizes
E: none of the above
Ans: C: parallax
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A speedy tortoise can run with a velocity of 10.0 cm/s and a hare can run 20.0 times as fast. In a race, they both start at the same time, but the hare stops to rest for 2.00 minutes. The tortoise wins by a shell (20.0 cm). What was the length of the race?
The ____________________ period (or "month") of the Moon is the time required for one revolution of the Moon around Earth with respect to the stars
Fill in the blank(s) with correct word
The volume of an ideal gas changes from 0.40 to 0.51 m3 although its pressure remains constant at 52 000 Pa. What work is done on the system by its environment?
a. 5.7E+3 J b. –5.7E+3 J c. –2.1E+4 J d. 2.1E+4 J e. –2.7E+4 J
The exit velocity is 12 m/s. The inlet velocity of the water is nearest:
(A) 6.31 m/s
(B) 4.32 m/s
(C) 3.95 m/s
(D) 3.24 m/s