The great contribution of Nicholas Copernicus was to
A) create a detailed model of our solar system with the Sun rather than Earth at the center.
B) prove that the Earth is not the center of the universe.
C) discover the laws of planetary motion.
D) discover the law of gravity.
A
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A 25-N force is needed to move an object with a constant velocity of 2.0 m/s. What power must be delivered to the object by the force?
A) 0.50 W B) 1.0 W C) 5.0 W D) 50 W E) 100 W
An 8 000-kg aluminum flagpole 100-m long is heated by the sun from a temperature of 10°C to 20°C. Find the heat transferred (in J) to the aluminum if the specific heat of aluminum is 0.215 cal/g×°C
a. 7.2 × 10^5 b. 7.2 × 10^7 c. 7.2 × 10^3 d. 7.2 × 10^1 e. 7.2 × 10^2
Why are molecular lines usually found in infrared and radio regions, not as visible lines?
What will be an ideal response?
Which one of the following is not true of neutrinos?
a. They have no charge. b. They have no spin. c. One type of neutrino may change into another type of neutrino. d. They are leptons. e. They do not take part in strong nuclear interactions.