What is meant by a hypothesis?
A) a natural phenomenon that requires explanation
B) an explanation for a phenomenon that makes a prediction
C) a tentative understanding of a natural phenomenon
D) a pseudoscientific idea
E) a historical theory that has been proved inaccurate
B
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A violation of the second law of thermodynamics would occur if
a. a ball lying on the ground started to bounce. b. transfer of energy by heat moved energy from an object at low temperature to an object at a higher temperature. c. a refrigerator heated the air in the room in which the refrigerator is located. d. any of the above occurred. e. (a) or (b) occurred, but not (c).
A photon of initial wavelength 0.651 nm, after being scattered from a free electron at rest, moves off at an angle of 120° with respect to its incident direction
(mel = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s) (a) What is the wavelength of the scattered photon? (b) What is the energy of the scattered photon?
The fusion reaction 
releases 17.6 MeV of energy. The mass of 2H is 2.01410 u, the mass of 4He is 4.00260 u, and the mass of 1n is 1.00866 u. What is the mass of 3H?
A. 2.99716 u B. 3.01605 u C. 3.03494 u D. 3.04221 u E. 2.99982 u
The velocity vector at a point in a fluid flow is given by 5i + 12j. The unit vector which is perpendicular to the streamline passing through the point is:
(A) (?12i + 5j)/13 (B) (?12i ? 5j)/13 (C) (5i + 12j)/13 (D) (?5i + 12j)/13