A 400-g block of iron at 400°C is dropped into a calorimeter (of negligible heat capacity) containing 60 g of water at 30°C
How much steam is produced? The latent heat of vaporization of water is 22.6 × 105 J/kg and its specific heat capacity is 4186 J/kg ? K. The average specific heat of iron over this temperature range is 560 J/kg ? K.
A) 22 g
B) 33 g
C) 42 g
D) 54 g
E) 59 g
A
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Suppose the distance to a star was doubled but everything else about the star stayed the same. What would happen to the star's luminosity and apparent brightness?
A) Luminosity is decreased by a factor of four and the apparent brightness is decreased by a factor of four. B) Luminosity is decreased by a factor of two and the apparent brightness is decreased by a factor of two. C) Luminosity remains the same, but the apparent brightness is decreased by a factor of two. D) Luminosity remains the same, but the apparent brightness is decreased by a factor of four. E) Luminosity is decreased by a factor of four, but the apparent brightness remains the same.
Dark energy can exist in completely empty space.
Answer the following statement true (T) or false (F)
When a spring is compressed, its mass increases
Indicate whether the statement is true or false
A rainbow shows separate colors of the spectrum because, at raindrop surfaces,
A. blue light is bent more than red light. B. all colors are bent the same, hence the separation. C. green light is bent more than blue light. D. red light is bent more than green light.