The internal energy of a system increases by 500 J while 610 J of work are performed on it. What was the heat flow into or out of the system?
A. -1110 J
B. 1110 J
C. -110 J
D. 110 J
C. -110 J
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During a lecture demonstration, a professor places two coins on the edge of a table. She then flicks one of the coins horizontally off the table, simultaneously nudging the other over the edge. Describe the subsequent motion of the two coins, in particular discussing whether they hit the floor at the same time
A. Both coins will hit the ground at the same time because the vertical component of the velocity is exactly the same for both coins. However, the horizontal component of the velocity are the same for the 2 coins, and so, the both coins will hit the ground at the same distance from the table. B. Both coins will hit the ground at the same time because the vertical component of the velocity is exactly the same for both coins. However, the horizontal component of the velocity are different for the 2 coins, and so, the first coin will hit the ground at a farther away distance from the table. C. Both coins will hit the ground at the same time because the horizontal component of the velocity is exactly the same for both coins. However, the vertical component of the velocity are different for the 2 coins, and so, the first coin will hit the ground at the same place as the second coin. D. The two coins will fall at the same rate. The nudged one will fall straight down, whereas the flung one will fall in a half parabola. Both coins though will land at the same time, because when they land is determined by their initial vertical velocity, and both coins had an initial vertical velocity of 0 m/s.
About how long does light take to cross the Milky Way?
A.) About a month. B.) About four years. C.) About 26,000 years. D.) About 100,000 years. E.) Millions of years.
A spring wound clock makes use of ________ energy to drive the mechanism.
What will be an ideal response?
The power rating of a 400-? resistor is 0.800 W
(a) What is the maximum safe voltage across this resistor? (b) What is the maximum current the resistor can safely draw?