A 15.0-kg child is sitting on a playground teeter-totter, 1.50 m from the pivot. What force, applied 0.300 m on the other side of the pivot, is needed to make the child lift off the ground?
A) 75.0 N
B) 736 N
C) 22.5 N
D) 44.1 N
E) 66.2 N
B
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Compared to a cold molecular cloud at 10 K, an HII region has a temperature about
A. 1,000 times hotter. B. 10 times hotter. C. 1,000,000 times hotter. D. the same.
A toy steam engine has a mass of 1.00 kg. The toy starts from rest and reaches a velocity of 4.00 m/s in a time of 3.00 seconds while covering a distance of 4.50 meters. During that time the toy takes in 30 J of heat. What is the change in the internal energy of the toy?
A. -52.0 J B. +52.0 J C. -22 J D. +22 J
The four Galilean moons of Jupiter are found within Jupiter's _______________
Fill in the blank(s) with correct word
A supermassive black hole in the center of a galaxy typically represents ____ of the galaxy's total mass
a. a tiny fraction of a percent b. about a percent c. 1-5% d. 10% e. 50%