An apple weighing 3 newtons hangs, motionless, from a tree branch. The net force on the apple is
A) impossible to determine from the information that is given.
B) 3 newtons upward.
C) 6 newtons downward.
D) 3 newtons downward.
E) None of the above.
E
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The diameter of a typical star (the sun) is approximately ____ times larger than the diameter of a typical planet (the Earth)
a. 10 b. 100 c. 1000 d. 10,000 e. 100,000
To become a negative ion, an atom must
A) lose an electron. B) gain an electron. C) lose a proton. D) gain a proton.
Lifting a 100-N load with 50 N of force lifts it
A) half as high. B) as high. C) twice as high.
The inhabitants of a planet in another galaxy have their eyes at the exact center of their 4.0-m long bodies. How long must a plane mirror be for such a creature to be able to see all of its body in the mirror?
a. 1.0 m b. 2.0 m c. 2.5 m d. 4.0 m e. 8.0 m