Momentum: What is the magnitude of the momentum of a 0.140 kg baseball traveling at 45.0 m/s?
Fill in the blank(s) with the appropriate word(s).
6.30 kg ? m/s
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A 10-cm focal length converging lens is used to magnify small newspaper print 2.0 mm high. Calculate the height of the image (in mm) for the maximum magnification for a normal eye
a. 3.5 b. 7.0 c. 9.2 d. 12 e. 2.5
A stars exhibit strong hydrogen absorption lines because the surface temperature of 10,000 K is high enough to place most hydrogen in an excited, but not yet ionized, state
The transitions from this excited state then correspond to visible light wavelengths. Which of the following statements is a plausible explanation for why G stars exhibit weak hydrogen absorption lines? A) G stars contain very little hydrogen. B) At these high temperatures, nearly all the hydrogen is ionized, and unable to interact with light. C) G stars are too cool to excite hydrogen atoms to the first energy level from which they can then absorb visible wavelengths of light.
Explain why the temperature change of coolant water in once-through cooling depends on the rate at which water is pumped through the condensers
What will be an ideal response?
Acetone is rubbed on a steel roller, 4 cm in diameter by 40 cm long, to clean it. Air at 25ºC is blown over the roller at 5 m/s. If the density of acetone vapor is 0.778 kg/m^3, estimate the rate of evaporation of acetone into the air. The viscosity of acetone may be taken as 0.01 g/m?s.
What will be an ideal response?