What is the image distance of an object 1.00 m in front of a converging lens of focal length 25.0 cm?
a. +25.0 cm
c. +20.0 cm
b. +33.3 cm
d. +16.7 cm
B
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Ethanol is to be condensed around cool 10ºC tubes of 1 cm outside diameter and at a 50 saturation temperature of 78.5ºC. Plot the heat transfer per unit length on horizontal tubes arranged as shown in Figure 10-17b and as predicted by Equation 10-49 as the number of tubes is increased. How does this result compare to the heat transfer predicted for a single tube or for a dripping, in-line tube arrangement as shown in Figure 10-17c? Ethanol has a heat of vaporization hnfg of 842 J/kg at atmospheric pressure.
What does not happen when an object approaches a black hole?
A: it becomes redder because photons lose energy B: time runs more slowly as it gets closer to the black hole C: it quickly gets sucked in even from a large distance D: it gets stretched out because of tidal forces E: none of the above
In South Africa, it's usually quite warm around the time of the Northern Hemisphere winter solstice and quite cool around the time of the summer solstice
Indicate whether the statement is true or false
A 3.0-kg block slides on a rough horizontal surface. A force of 8.0 N acting parallel to the surface is applied to the block. The coefficient of kinetic friction between the block and the surface is 0.15 . What is the magnitude of the block's acceleration?
a. 1.9 m/s2 b. 1.2 m/s2 c. 2.3 m/s2 d. 1.5 m/s2 e. 2.9 m/s2