Imagine that the wave shown below moves right along a stretched string. It meets and passes through one of the left-going waves provided in the choices. For which choice is there an instant where the string is flat?
A. A
B. B
C. C
D. D
E. None of the above
B. B
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The modulus of _____________is the maximum strain energy that a material can absorb and then fully return when unloaded.
Fill in the blank(s) with the appropriate word(s).
A transformer actually transforms
A) energy from one value of voltage to another. B) magnetic and electric field lines. C) generators into motors. D) motors into generators. E) all of the above
In this figure, 10 calories of heat are added to each of the two samples of the same gas. Why is T1 greater than T2?
a. There are fewer atoms or molecules in the smaller object, so each atom (molecule) must move more vigorously for a given amount of heat (energy) transferred to the material. b. The thermometer is able to absorb heat from the smaller object more rapidly. c. This follows from the ideal gas law.
Which of the following choices best corresponds to what is required by the second law of thermodynamics for any process taking place in an isolated system?
a. entropy decreases b. entropy remains constant c. entropy increases d. entropy equals work done on the system