What is a heat engine?
a. A machine that heats up as it does work.
b. A machine that produces heat.
c. A machine that destroys heat, cooling its surroundings.
d. A machine that converts heat to work.
e. A machine that transfers heat to surrounding cooler objects.
d
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Each y-direction force on frame ABCDEF below acts at the center of the bar segment to which it is applied. Support B is restrained against translation in the y and z directions only, and support C is restrained in the z direc- tion only. Support D is a pin support. Equilibrium of the frame requires that reaction force Cz is (in newtons):
(A) 80.8 N
(B) 67.7 N
(C) 14.8 N
(D) 92.2 N
Consider two pipes of the same length: one pipe is open at both ends and the other pipe is closed on one end but open at the other end
If the fundamental frequency of the totally open pipe is 300 Hz, what is the fundamental frequency of the other pipe? A) 150 Hz B) 300 Hz C) 450 Hz D) 600 Hz
Assume the Heisenberg uncertainty principle can take the form ?E?t ? h/4B. How accurate can the position of an electron be made if its speed is 5 × 10^6 m/s and if the uncertainty in its energy is 10 eV?
a. 7.7 × 10^?18 m b. 1.3 × 10^?23 m c. 6.2 × 10^?15 m d. 1.6 × 10^?10 m e. 1.2 × 10^?9 m
Which of the following forms of energy is the greatest for a system of a comet in orbit about the Sun during perihelion (the comet's closest approach to the Sun)
1.the total mechanical energy 2.the potential energy 3.the kinetic energy 4.none of these