A girl is using a rope to pull a box that weighs 300 N across a level surface with constant velocity. The rope makes an angle of 30° above the horizontal, and the tension in the rope is 100 N. What is the normal force of the floor on the box?
a. 350 N
b. 200 N
c. 400 N
d. 250 N
e. 213 N
d
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What will be an ideal response?
The singularity of a black hole
a. is found outside the event horizon. b. is located within the event horizon. c. can only be located if the black hole is in a binary system. d. doesn't exist since all black holes have a finite size.
On a cold day, you take in 4.2 L of air into your lungs at a temperature of 0°C
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