Which is longer, the sidereal or synodic month? Why?
What will be an ideal response?
The synodic month takes an extra two days, because the Earth is also revolving around the Sun, so after 27.3 days the Moon returns to the same place among the stars, but the Earth has revolved about 27 degrees ahead of where it was last month; it takes the Moon two days to catch up to us.
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Constant Acceleration Kinematics: Acceleration is sometimes expressed in multiples of g, where g = 9.8 m/s2 is the acceleration of an object due to the earth's gravity. In a car crash, the car's forward velocity may go from 29 m/s to 0 m/s in 0.15 s. How many g's are experienced, on average, by the driver?
A. 20 g B. 14 g C. 24 g D. 26 g
Type II supernova spectra are poor in hydrogen because stars that explode this way use up all their hydrogen before they leave the main sequence
Indicate whether the statement is true or false
Which of the following is not used as a moderator material for nuclear reactors?
A) sodium B) heavy water C) graphite D) boron E) These are all used as a moderator material for nuclear reactors.
A 1.10-kg wrench is acting on a nut trying to turn it. The length of the wrench lies directly to the east of the nut. A force 150.0 N acts on the wrench at a position 15.0 cm from the center of the nut in a direction 30.0° north of east
What is the magnitude of the torque about the center of the nut? A) 22.5 N ? m B) 11.3 N ? m C) 19.5 N ? m D) 2250 N ? m E) 1949 N ? m