A gasoline engine absorbs 2500 J of heat at 250°C and expels 2000 J at a temperature of 50°C. What is the magnitude of the change in entropy (in J/K) for the system?
a. 6.2
b. 4.7
c. 1.4
d. 10.9
e. 3.2
c
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Which of the following is an example of a scientific model?
a. celestial sphere b. connected balls and rods representing chemical bonds of a DNA molecule c. topographical map d. All of the other choices are correct.
A wheel (radius = 0.20 m) starts from rest and rotates with a constant angular acceleration of 2.0 rad/s2 . At the instant when the angular velocity is equal to 1.2 rad/s, what is the magnitude of the total linear acceleration of a point on the rim of the wheel?
a. 0.40 m/s2 b. 0.29 m/s2 c. 0.69 m/s2 d. 0.49 m/s2 e. 0.35 m/s2
Shortly after the Big Bang, the chemical composition of the universe was
A) almost entirely hydrogen and helium. B) hydrogen only. C) about equal amounts of all the elements. D) about the same as it is today.
Which statement is correct about the relationship between the instantaneous speed and the magnitude of the instantaneous velocity?
A) The average speed can be less than, greater than or equal to the magnitude of the average velocity. B) The instantaneous speed is always equal to the magnitude of the instantaneous velocity. C) The average speed is always less than or equal to the magnitude of the average velocity. D) The instantaneous speed is always greater than or equal to the magnitude of the instantaneous velocity. E) The average speed is always one-half the magnitude of the average velocity.