A dashing Romanian count asks his sweetheart to marry him. She says she will give her reply when the Moon is full. If he asked when the Moon was at first quarter, how long will he have to wait?
A. about a week
B. about three weeks
C. about a day
D. about a month
Answer: D. about a month
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Neutral hydrogen can be detected because its electron occasionally ________ its spin and creates the 21-cm emission line for radio observers
Fill in the blank(s) with correct word
In a ballistics test, a 28-g bullet pierces a sand bag that is 30cm thick
If the initial bullet velocity was 55m/s and it emerged from the sandbag moving at 18m/s what was the magnitude of the friction force (assuming it to be constant) that the bullet experienced while it traveled through the bag? A) 1.3 N B) 130 N C) 38 N D) 13 N
The amount of heat necessary to change 1 kg of a solid into a liquid at the same temperature is called the
a. entropy. b. melting point. c. latent heat of vaporization. d. latent heat of fusion.
A 3.0-m rod is pivoted about its left end. A force of 10 N is applied perpendicular to the rod at a distance of 1.2 m from the pivot causing a ccw torque, and a force of 5.2 N is applied at the end of the rod 3.0 m from the pivot. The 5.2-N force is at an angle of 30o to the rod and causes a cw torque. What is the net torque about the pivot? (Take ccw as positive.)
a. 18 N•m c. 4.2 N•m b. -18 N•m d. -4.2 N•m