A box that weighs 300 N is pulled across a level surface with a constant velocity. The rope makes an angle of 30.0 degree above the horizontal and the tension in the rope is 100 N. What is the normal force of the floor on the box?
A. 86 N
B. 300 N
C. 50 N
D. 250 N
E. 0 N
D. 250 N
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What type of object is believed to be the central source of energy for an active galaxy?
A. globular cluster B. a large amount of gas and dust C. an unusually large and bright main sequence star D. a massive black hole
The top of the troposphere is called the
a. stratopause. b. tropopause. c. mesopause. d. thermopause.
A pinhole camera is used to photograph a 23-cm tall object at a distance of 3.0 m, the image being projected on film at a distance of 46 cm from the pinhole. What are the height and orientation of the image?
a. 3.5 cm, upright c. 12 cm, upright b. 3.5 cm, inverted d. 12 cm, inverted
In many ways, an electric circuit is like the plumbing system in your home. The voltage on an electric circuit corresponds to the ________ in a plumbing system.
A. pressure B. drain C. faucet or valve D. trap