A gasoline engine absorbs 2 500 J of heat and performs 1 000 J of mechanical work in each cycle. The efficiency of the engine is
a. 80%
b. 40%
c. 60%
d. 20%
e. 50%
B
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Suppose a 70-kg student were to be compressed to form a black hole. What would be the Schwarzschild radius of this black hole? (G = 6.67 × 10-11 N ? m2/kg2, c = 3.0 × 108 m/s)
What will be an ideal response?
Which of these gases are outgassed from our volcanic eruptions?
A) oxygen, methane, ammonia B) carbon dioxide, water vapor, oxygen C) ammonia, water vapor, oxygen D) water vapor, methane, carbon dioxide E) helium, carbon dioxide, methane
A device that measures absolute air pressure is called a __________
Fill in the blank(s) with correct word
Energy Conservation With Conservative Forces: Two identical grasshoppers jump into the air with the same initial speed and experience no air resistance. Grasshopper A goes straight up, but grasshopper B goes up at a 66° angle above the horizontal. Which of the following statements about these grasshoppers are correct? (There could be more than one correct choice.)
A. At their highest point, both of them have the same amount of gravitational potential energy. B. At their highest point, both of them have the same amount of kinetic energy. C. At their highest point, both of them have the same amount of mechanical energy. D. At their highest point, grasshopper B is moving faster than grasshopper A. E. At their highest point, grasshopper A has more gravitational potential energy than grasshopper B.