An object that appears green in empty space is placed near but not in a black hole. To an observer far from the black hole, the object would appear
A. red.
B. black.
C. green.
D. blue.
E. brown.
Answer: A
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If you confine an electron to a box and know that the uncertainty in the electron's speed is 65 m/s,
what is the smallest length that the box could have? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s) A) 8.4 × 10-6 m B) 1.1 × 10-5 m C) 1.8 × 10-5 m D) 5.8 × 10-6 m E) 1.8 × 10-6 m
The velocity of sound in sea water is 1.53 × 10^3 m/s. Find the bulk modulus (in N/m2) of sea water if its density is 1.03 × 10^3 kg/m3
a. 2.57 × 10^9 b. 2.19 × 10^9 c. 2.04 × 10^9 d. 2.41 × 10^9 e. 2.82 × 10^9
If no force is applied to a moving object, it will continue to move with constant speed in a straight line
Indicate whether the statement is true or false
Components: If a vector 
has components Ax > 0, and Ay < 0, then the angle that this vector makes with the positive x-axis must be in the range
A. 0° to 90°. B. 90° to 180°. C. 180° to 270°. D. 270° to 360°. E. It cannot be determined without additional information.