In one cycle of operation, the thermal energy input to a particular heat engine is 200 joules and the exhaust is 80 joules. The efficiency of this engine is
A) impossible to determine from the given information.
B) 40 percent.
C) 80 percent.
D) 20 percent.
E) 60 percent.
E
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The energy to extend a crack in a stressed material comes from _________of stresses along the crack surface.
Fill in the blank(s) with the appropriate word(s).
A 25-L container holds ideal hydrogen (H2 ) gas at a gauge pressure of 0.25 atm and a temperature of 0°C. What mass of hydrogen gas is in this container?
The ATOMIC mass of hydrogen is 1.0 g/mol, the ideal gas constant is R = 8.314 J/mol•K = 0.0821 L ? atm/mol ? K, and 1.00 atm = 101 kPa. A) 2.8 g B) 1.4 g C) 4.2 g D) 6.3 g E) 5.6 g
When a light beam enters glass from air the beam is refracted. Why does this happen? (Hint: What physical property of the light changes?)
A skater is using very low-friction rollerblades. A friend throws a Frisbee at her, on the straight line along which she is coasting. Describe the following event as an elastic, an inelastic, or a perfectly inelastic collision between the skater and the Frisbee. She tries to catch the Frisbee, but it bounces off her hands and falls to the ground in front of her
1.elastic 2.inelastic 3.perfectly inelastic