What is the maximum theoretical efficiency possible for an engine operating between and 400°C?
What will be an ideal response?
45%
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As a monochromatic light ray is transmitted through an air-to-glass boundary, what happens to the wavelength?
a. increases b. decreases c. remains unchanged d. approaches zero value
A small sports car collides head-on with a massive truck. Which vehicle experiences the greater impact force (in magnitude)?
1.the car 2.the truck 3.Neither, the force is the same on both.
How do we know that galaxy clusters contain a lot of mass in the form of hot gas that fills spaces between individual galaxies?
A) We detect this gas with x-ray telescopes. B) We infer its existence by observing its gravitational effects on the galaxy motions. C) The hot gas shows up as bright pink in visible-light photos of galaxy clusters. D) We can observe the frictional effects of the hot gas in slowing the speeds of galaxies in the clusters.
If the measured momentum of an electron is 3.20 × 10^-27 kg×m/s with an uncertainty of 4.8 × 10^-28 kg×m/s, what is the minimum uncertainty in the position? (h = 6.63 × 10^-34 J×s)
a. 0.63 × 10^-4 m c. 3.3 × 10^-6 m b. 2.2 × 10^-7 m d. 1.1 × 10^-7 m