An automobile engine operates with an overall efficiency of 12%. How much energy is delivered as waste heat (in gallons of gasoline) for each 10 gallons of fuel burned?
a. 1.2
b. 8.8
c. 6.5
d. 4.7
e. 7.5
B
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Which of the following general statements about Earth's atmosphere is not true?
A) The oxygen in our atmosphere was released by living organisms. B) Without the relatively rare gas called ozone, Earth's surface would be bathed in dangerous ultraviolet light from the Sun. C) The nitrogen and oxygen in Earth's atmosphere keep the surface pleasantly warm. D) Gas high in the atmosphere absorbs dangerous X-rays from the Sun.
A car is moving with a speed of 32.0 m/s. The driver sees an accident ahead and slams on the brakes, causing the car to slow down with a uniform acceleration of magnitude 3.50 m/s2
How far does the car travel after the driver put on the brakes until it comes to a stop? A) 4.57 m B) 9.14 m C) 112 m D) 146 m E) 292 m
To orient a single crystal in an x-ray beam, it would be best to use
(a) A Debye-Scherrer camera (b) The Laue technique (c) A powder diffractometer (d) A single-crystal diffractometer
A 0.120-pF parallel-plate capacitor is charged to a potential difference of 10.0 V and then disconnected from the battery. A cosmic ray burst creates 1.00 × 10^6 electrons and 1.00 × 10^6 positive charges between the plates. If the charges do not recombine, but reach the oppositely charged plates, by how much is the potential difference between the capacitor plates reduced?
a. 1.33 V b. 7.34 V c. 8.67 V d. 1,330 V e. 8,670 V