How much heat needs to be removed from 100 g of 85°C water to make -5°C ice?
A)
255 cal
B)
168 kcal
C)
8.5 kcal
D)
16.5 kcal
E)
16.8 kcal
E
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Imagine for a moment that despite all the evidence, Earth actually is not rotating and orbiting the Sun. Which of these hypothetical observations (none of them are real) would be inconsistent with our Sun-centered view of the solar system?
A) We find that we are unable to measure any parallax for a distant galaxy. B) We discover an Earth-sized planet orbiting the Sun beyond the orbit of Pluto. C) We discover that the universe is actually contracting, not expanding. D) We discover a small planet beyond Saturn that rises in the west and sets in the east each day.
If the secondary coil of a transformer contains more loops than the primary coil, then it is a
A) step-up transformer. B) step-down transformer.
Two slits separated by 0.050 mm are illuminated with green light (l = 540 nm). How many bands of bright lines are there between the central maximum and the 12-cm position? (The distance between the double slits and the screen is 1.0 m.)
a. 1111 b. 111 c. 11 d. 1 e. 11111
Water is flowing at 4.0 m/s in a circular pipe. If the diameter of the pipe decreases to 1/2 its former value, what is the velocity of the water downstream?
a. 1.0 m/s b. 2.0 m/s c. 8.0 m/s d. 16 m/s e. 4.0 m/s