Which of the following represents a departure from the philosophical materialism of Newtonian physics?
A) forces
B) thermal energy
C) the second law of thermodynamics
D) sound waves
E) electromagnetic fields
E
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A thermodynamic engine absorbs 85.6 kJ of energy each cycle and exhausts 61.8 kJ. (a) What is the efficiency of the engine? (b) How much work does it do each cycle?
What will be an ideal response?
If liquid PMMA is rapidly cooled to room temperature, the structure is ______________.
Fill in the blank(s) with the appropriate word(s).
A basketball player jumps to make a basket, and remains in the air for a moment. A sportscaster, talking about the game, then remarks that she has "defied gravity." Which of the following accurately describes the situation?
A) The player did stay in the air in spite of the Law of Gravitation, but a single counter-observation is not enough to warrant revisiting a theory that usually works. B) The player produced enough force with her legs to accelerate up into the air, and gravity brought her back down with an acceleration of 9.8 m/s2. C) The player only seemed to defy gravity, but part of the Universal Law of Gravitation makes an exception for basketball players. D) The player has defied gravity, so scientists must go back into the lab to refine their theory.
Including relativistic effects, doubling the speed of a object:
a. has no effect on its momentum. c. less than doubles its momentum. b. more than doubles its momentum. d. doubles its momentum.