When you sit in a chair there is necessarily a reaction force to the gravitational force acting on your body. Which of the following best describes this reaction force?
1.the force of gravity you exert on the Earth
2.the force you exert downward on the seat of the chair
3.the normal force exerted by the chair onto you
4.none of these forces
1
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A small 1.4-N stone slides down a frictionless bowl, starting from rest at the rim. The bowl itself is a hemisphere of radius 75 cm. Just as the stone reaches the bottom of the bowl, how hard is the bowl pushing on it?
A) 0.70 N B) 1.4 N C) 2.8 N D) 4.2 N E) 5.6 N
Suppose there are 3 molecules in a container. If each molecule has a 1-in-2 chance of being in the left half of the container, what is the probability that there are exactly 2 molecules in the left half of the container?
a. 1/2 b. 1/3 c. 1/8 d. 3/8 e. 3/5
"GFI" stands for:
a. grand flux indicator. b. ground forcing indicator. c. ground fault interrupter. d. gauss-free invention.
Mary builds a simple refracting telescope using two lenses of focal length 80 cm and 5.0 cm. The respective diameters are 60 mm and 10 mm
How many degrees wide does the moon appear through the telescope if it appears only 1/2 degree wide with the "naked eye"?