An apple weighing 3 newtons hangs, motionless, from a tree branch. Newton's law of force pairs says that forces always come in pairs. One force acting on the apple is the apple's weight
What is the other force that forms a force pair with the weight?
A) The apple pulling upward on Earth. B) The apple pulling downward on the branch.
C) Earth pulling downward on the apple. D) The branch pulling upward on the apple.
A
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Which of the following statements is true in the context of the formation of stars from the interstellar medium?
A) The densest interstellar clouds contain from 108-1011 atoms/cm3. B) The densest interstellar clouds have temperatures as low as 1000 K. C) Clouds can never resist their own gravity and eventually collapse under its influence to transform into stars. D) Stars can form in molecular clouds when the densest parts of the clouds become unstable and contract.
The color of a star is a measure of its
A) surface temperature B) chemical composition C) mass D) size
A 1.50-H inductor is connected in series with a 200-? resistor through a 15.0-V dc power supply and a switch. If the switch is closed at t = 0 s, what is the energy stored by the inductor 20.0 ms after the switch is closed?
A) 0.910 mJ B) 1.83 mJ C) 3.65 mJ D) 7.31 mJ E) 5.48 mJ
Object A has a charge q on it, object B has a charge q on it, and object C has a charge 2q on it. These charges are arranged, one each, at the vertices of an equilateral triangle. Which charge has the greatest magnitude electric force on it?
a. A b. C c. B d. All have equal magnitude forces on them.