Historians trace the origins of a 24-hour day to
A) the druids of Stonehenge.
B) the ancient Egyptians.
C) the Mayans.
D) the Aztecs.
E) the Babylonian astronomer, Meton.
B
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Two points on a merry-go-round are located at distances from the center r1 and r2, where r1 < r2 . While the merry-go-round is in the process of speeding up to operational speed, which of the following equations involving magnitudes of angular speed, angular acceleration, and tangential speed for these points is incorrect?
a. ?1 = ?2 b. ?1 = ?2 c. vt1 = vt2 d. All of the equations are correct.
A blacksmith drops a 550 °F piece of iron into a vat of 75 °F water in order to cool it to 100 °F. How many kilograms of water are needed per kilogram of iron? Assume all the thermal energy from the iron is transferred to the water and none of the water evaporates. The specific heats of water and iron are 4186 J/kg/°C and 448 J/kg/°C, respectively
a. 9.3 kg b. 0.78 kg c. 0.52 kg d. 1.9 kg
Pre-main sequence stars are above and to the right of the main sequence
Indicate whether the statement is true or false
Work is a vector quantity
Indicate whether the statement is true or false