Consider the equipotential surfaces shown in Figure 25.4. In this region of space, what is the approximate direction of the electric field?
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Entropy: What is the change in entropy when 15.0 g of water at 100°C are turned into steam at 100°C? The latent heat of vaporization of water is 22.6 × 105 J/kg.
A. 90.8 J/K B. -90.8 J/K C. 339 J/K D. -339 J/K E. 0 J/K
A golf ball moving forward with 1 unit of momentum strikes a heavy bowling ball that is initially at rest. After the golf ball bounces backward, the bowling ball is in motion with a momentum that must be
1) 1 unit. 2) more than 1 unit. 3) less than 1 unit. The magnitude of the golf ball's momentum after collision must be somewhat less than 1 unit, for otherwise a violation would occur in the conservation of 4) energy. 5) momentum. 6) both. 7) neither.
A 400-W computer (computer plus monitor) is turned on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost to run the computer annually?
A) $116.80 B) $1168.00 C) $14.60 D) $16.80 E) $146.00
A mass spectrometer separates
A) ions of different elements. B) different-mass ions of the same element. C) different-mass ions of the same speed. D) all of the above E) none of the above