A engine manufacturer makes the claim that the engine they have developed will, on each cycle, take 100 J of heat out of boiling water at 100°C, do mechanical work of 80 J, and exhaust 20 J of heat at 10°C
What, if anything, is wrong with this claim? A)
The heat exhausted must always be greater than the work done according to the second law of thermodynamics.
B)
This engine violates the first law of thermodynamics because 100 J + 20 J ? 80 J
C)
An engine would operate by taking in heat at the lower temperature and exhausting heat at the higher temperature.
D)
The efficiency of this engine is greater than the ideal Carnot cycle efficiency.
E)
There is nothing wrong with this claim because 100 J = 20 J + 80 J.
D
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A physics student is riding on a train traveling north. Having read about inertia, the student performs an experiment with a golf ball. He reaches over the aisle and drops the ball from rest. Instead of hitting the floor directly below the student's hand, it hits to the north, i.e., forward of that position. Which of the following might be the cause for this to happen?
a. The train is moving at constant velocity. c. The train is slowing down. b. The train is speeding up. d. Whatever the cause, it cannot be any of the answers given.
The Zeeman effect, in which energy levels of electrons are shifted and produce a corresponding split in spectral lines observed, is used to measure ________ at the Sun's surface.
A. the velocity and oscillations of gas B. gravitational field strength C. magnetic field strength D. the intensity of gamma rays
All the following statements are true. Which one explains why mean solar time differs from apparent solar time?
A) The length of a solar day is not always exactly 24 hours. B) Earth's rotation period is actually about 23 hours and 56 minutes, not 24 hours. C) Earth's axis precesses with a period of about 26,000 years. D) The Sun reaches the meridian at different times at different longitudes within the same time zone. E) The path of the Sun through the sky depends on both latitude and date.
Diversity of plant species in a plot increases overall yields
What will be an ideal response?