A seesaw made of a plank of mass 10.0 kg and length 3.00 m is balanced on a fulcrum 1.00 m from one end of the plank. A 20.0-kg mass rests on the end of the plank nearest the fulcrum
What mass must be on the other end if the plank remains balanced? A) 6.67 kg
B) 7.50 kg
C) 10.0 kg
D) -10.0 kg
E) 5.00 kg
B
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Which of the following is not a characteristic of the stars of the disk component of our galaxy?
a. circular orbits b. randomly inclined orbits c. higher metal abundance d. young stars e. star formation regions
Two concentric imaginary spherical surfaces of radius R and 2R respectively surround a positive point charge ?Q located at the center of the surfaces. When compared to the electric flux ?1 through the surface of radius R, the electric flux ?2 through the surface of radius 2R is
A.
.B.
.C.
D.
E.
At the equinoxes, the declination of the Sun must be zero degrees
Indicate whether the statement is true or false
The addition of salt to water affects its
A) crystal composition. B) freezing point. C) viscosity. D) liquidity. E) none of the above