A reading of a tire gauge tells you that the gauge pressure in a tire is 31 lb/in2 . What is the absolute pressure in the tire? Assume that atmospheric pressure is 14 lb/in2
a. 17 lb/in2 b. 59 lb/in2
c. 45 lb/in2 d. You can't be sure since you may have nitrogen-filled tires.
c
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A very light 1.00-m wire consists of two segments of equal length, one of steel (Young's modulus is 2.00 × 1011 N/m2) and one of brass (Young's modulus is 9.0 × 1010 N/m2)
The steel segment is 1.50 mm in diameter, and the brass segment has twice this diameter. When a weight w is hung from the ceiling by this wire, the steel segment stretches by 1.10 mm. By what distance does the brass segment stretch? A) 0.50 mm B) 0.61 mm C) 1.2 mm D) 2.4 mm E) 9.8 mm
How did Harlow Shapley use the period-luminosity relationship of RR Lyrae variables to determine the size of the Milky Way galaxy?
a. He determined the proper motion of globular clusters in the outer disk of the galaxy. b. He found the distances to individual variables free floating in the halo. c. He found the distances to open clusters found throughout the disk of the galaxy. d. He found the distances to globular clusters distributed about the center of the galaxy.
A container of ideal gas at STP undergoes an isothermal expansion and its entropy changes by 3.66 J/°K. How much work does it do?
What will be an ideal response?
When gasoline is burned, it gives off 46,000 J/g of heat energy. If an automobile uses 13.0 kg of gasoline per hour with an efficiency of 18%, what is the average horsepower output of the engine? (1 hp = 746 W)
a. 47 hp c. 67 hp b. 110 hp d. 40 hp