A transformer is designed to step down the 120V line voltage to 9V. If there are 400 turns on the input coil, how many turns should there be on the output coil?
30
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A 2.00 kg piece of lead at 40.0°C is placed in a very large quantity of water at 10.0°C, and thermal equilibrium is eventually reached. Calculate the TOTAL change in entropy that occurs during this process
The specific heat of lead is 130 J/(kg?K). A) 6.6 J/K B) 190 J/K C) 1.4 J/K D) 100 J/K E) 6.2 J/K
During a snowball fight two balls with masses of 0.30 and 0.70 kg, respectively, are thrown in such a manner that they meet head-on and combine to form a single mass. The magnitude of initial velocity for each is 12.0 m/s. What is the speed of the 1.0-kg mass immediately after collision?
a. zero b. 4.8 m/s c. 12 m/s d. 8.4 m/s e. 3.6 m/s
According to the following figure, about how long ago did oxygen reach its current abundance in Earth's atmosphere?
a. 3 billion years ago b. 1 billion years ago c. 0.5 billion years ago d. 0.25 billion years ago e. 0.1 billion years ago
The watt, W, is equivalent to which of the following?
A. A·V
B. C·J
C. C/J
D. A/V
E. 