If Body A's mass is suddenly doubled, then its gravitational force to Body B decreases
a. True
b. False
Indicate whether the statement is true or false
False
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You are standing near a railroad track and a train is moving toward you at 60 mph and blowing its horn. What will you notice as the train moves past you?
a. As the train approaches, the horn will sound lower in pitch than when the train is moving away. b. As the train approaches, the horn will sound higher in pitch than when the train is moving away. c. There will be no change in the pitch of the horn as it moves by. d. The horn will get louder as the train moves away from you. e. The horn will get quieter as the train moves toward you.
The luminosity (L) of a star is the total energy the star radiates in _______________
Fill in the blank(s) with correct word
The loop is entirely inside the field.
A. forward (in the +x direction). B. backward (in the -x direction). C. zero. D. some other direction (specify).
The expression(s) indicating the number of protons in a nucleus is
a. A b. N c. Z d. Z + N e. A – Z