A slide projector has a lens of focal length 150. mm. An image 100. cm × 100. cm is formed of a slide whose dimensions are 50.0 mm × 50.0 mm. How far from the lens must the screen be placed?
What will be an ideal response?
3.15 m
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Imagine that at a certain place in a river, water moves horizontally to the left. Consider an oriented sur-face facing upward. The flux of water velocity through this surface is
A. positive. B. negative. C. zero. D. Impossible to determine from the given information.
What is meant by a boundary layer?
What will be an ideal response?
One gram of water is heated from 0°C to 100°C at a constant pressure of 1 atm. Determine the approximate change in internal energy (in cal) of the water
a. 160 b. 130 c. 100 d. 180 e. 50
The observed slowing down of time predicted by Einstein's Special Theory of Relativity for an object traveling close to the speed of light is referred to as
A) time dilation B) time expansion C) a time warp D) time contraction