Where do the "conversion losses" shown in Figure 7.1 come from?
What will be an ideal response?
No real process is 100% efficient. This inefficiency is the source of such
conversion losses.
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A rocket is moving at 1/4 the speed of light relative to Earth. At the center of this rocket, a light suddenly flashes. To an observer at rest on Earth,
A) the light will reach the front of the rocket at the same instant that it reaches the back of the rocket. B) the light will reach the front of the rocket before it reaches the back of the rocket. C) the light will reach the front of the rocket after it reaches the back of the rocket.
That quasars were at cosmological distances yet appeared like ordinary faint stars meant
A) they were the brightest stars ever observed. B) they must be very large. C) they must contain many O and B type stars. D) they must be producing such large quantities of energy than even fusion could not explain their output. E) they must be very small, but bright due to gravitational lensing.
Compare the internal energy of one gram of steam to that of one gram of water if both are at 100°C.
A. The internal energy of the water and steam are the same B. The internal energy of the steam will be higher C. The internal energy of the water will be higher
A substance is allowed to diffuse along a 10-cm length of tubing filled with water. The cross section of the tube is 5.3 cm2 . If the diffusion coefficient is 5.0 × 10^¯10 m2/s, and 6.5 × 10^¯14 kg is transported along the tube in 16 s, what is the difference in the concentration levels of the substance at the two ends of the tube?
a. 3.9E–1 kg/m3 b. 4.3E–2 kg/m3 c. 1.5E–3 kg/m3 d. 8.1E–4 kg/m3