Since LF,ice = 333 J/g, what is the change in entropy (in cal/K) when 1.00 kg of ice melts?
a. 144
b. 291
c. 312
d. 516
e. 80
b
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As you’ve learned from Part B, hydrogen and helium gas never condense under conditions found in the solar nebula. The remaining three categories of material in the solar nebula are shown again here. Rank these materials from left to right based on the distance from the Sun at which they could condense into a solid in the solar nebula, from farthest to closest.
What will be an ideal response?
Which is true about cold dark matter?
a) Cold dark matter interacts strongly with ordinary baryonic matter via the strong force. b) Cold dark matter particles travel faster than the speed of light. c) Cold dark matter particles travel more slowly than hot dark matter particles. d) Cold dark matter exists only within planets and stars but not in other parts of galaxiesor intergalactic space. e) Cold dark matter emits X-rays, but no other forms of radiation.
Two speakers are placed side by side and driven by the same frequency of 0.50 kHz
If the distance from a person to one speaker is 5.0 m and the person detects little or no sound, which of the following is a possible the distance from the person to the other speaker? The sound speed in the room is 340 m/s. A) 7.7 m B) 8.1 m C) 8.4 m D) 9.1 m
A metal sphere of radius 10 cm carries a charge of +2.0 ?C. What is the magnitude of the electric field 5.0 cm outside the sphere's surface?
A) 4.0 × 105 N/C B) 8.0 × 105 N/C C) 4.2 × 106 N/C D) 4.0 × 107 N/C E) 8.0 × 107 N/C