An object is placed 35 cm in front of a converging (convex) lens. if the image height is erect at 13.5 mm, find the focal length of the lens.

An object's buoyant force and weight mean the same thing.a. trueb. false

What is the single most important equation in all of physics?

Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.