To estimate the distance in kilometers of a flash of lightning, count the number of seconds between seeing the flash and hearing the accompanying thunder, then divide by
A) 2.
B) 3.
C) 4.
D) 5.
E) none of the above
Answer: B
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Warm air rises and cool air sinks. So, when an air parcel rises it becomes
A) cooler. B) warmer. C) more stable. D) less stable.
Two concentric circular wire loops in the same plane each carry a current. The larger loop as a current of 8.46 A circulating clockwise and has a radius of 6.20 cm. The smaller loop has a radius of 4.42 cm. What is the magnitude and direction of the current in the smaller loop if the total magnetic field at the center of the system is zero?
A. 6.03 A CCW B. 6.03 A CW C. 12.8 A CCW D. 12.8 A CW
Weight and g: An piece of space debris is released from rest at an altitude that is two earth radii from the center of the earth. Compared to its weight on Earth, the weight of this debris is
A. zero. B. the same as on the surface of the earth. C. one-half of its weight on the surface of the earth. D. one-third of its weight on the surface of the earth. E. one-quarter of its weight on the surface of the earth.
First Law of Thermodynamics: An expandable container holds 2.30 mole of helium, He, gas with an initial pressure of 770 kPa and an initial volume of 2.10 L. The gas expands isothermally to a final pressure of 350 kPa. How much heat is gained by the gas during this process? (R = 8.31 J/mol ? K)
A. 1280 J B. 792 J C. 685 J D. 1370 J E. 1700 J