(a) A slide projector is to project a (40 mm x 20 mm) slide on a 4 m x 4 m screen. Find the focal length of the convex lens used if the screen is 10 m away from the lens. (b) Which of the following mirrors or lenses could produce a virtual image?Explain.
(i) Concave lens
(ii) Convex lens
(iii) Convex mirror​

If a balloon is taken outside on a very cold day, what will occur?

At an oceanside nuclear power plant, seawater is used as part of the cooling system. this raises the temperature of the water that is discharged back into the ocean. the amount that the water temperature is raised has a uniform distribution over the interval from 10° to 25° c. what is the standard deviation of the temperature increase?

An engine undergoes a cycle as shown in the diagram. during a complete cycle the work done by the gas is 28.5×103 j and the energy transferred thermally out is 99.4×103 j. there are 1.5×1024 gas molecules and they have three active degrees of freedom. 6. (6 pts) during which process(es) is energy transferred thermally into the gas? a. 1→2 b. 2→3 c. 4→1 d. 1→2 and 4→1 e. none of the above