Twenty grams of a solid at 70°C is place in 100 grams of a fluid at 20°C. Thermal equilibrium is reached at 30°C. The specific heat of the solid
a. is equal to that of the fluid.
b. is less than that of the fluid.
c. is more than that of the fluid.
d. cannot be compared to that of a material in a different phase.
c
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Which of the following statements about the celestial sphere is not true?
A) When we look in the sky, the stars all appear to be located on the celestial sphere. B) Earth is placed at the center of the celestial sphere. C) The celestial sphere does not exist physically. D) The "celestial sphere" is just another name for our universe. E) From any location on Earth, we can see only half the celestial sphere at any one time.
How do the light-collecting area and best possible angular resolution of telescope with a 10-meter diameter mirror compare to that of a telescope with a 5-meter diameter mirror?
A) The 10-meter telescope has double the light collecting area, and its angular resolution is better by a factor of 2. B) The 10-meter telescope has 4 times the light collecting area, and its angular resolution is better by a factor of 2. C) The 10-meter telescope has 4 times the light collecting area, and its angular resolution is better by a factor of 4. D) The 10-meter telescope has 10 times the light collecting area, and its angular resolution is better by a factor of 5.
Why do other systems have planetary types that don't fall neatly into the terrestrial and jovian categories that we identify in our solar system?
What will be an ideal response?
The only force acting on a 2.0-kg body moving along the x axis is given by Fx = (2.0x) N, where x is in m. If the velocity of the object at x = 0 is +3.0 m/s, how fast is it moving at x = 2.0 m?
a. 4.2 m/s b. 3.6 m/s c. 5.0 m/s d. 5.8 m/s e. 2.8 m/s