Physics, 22.09.2019 03:10, mamasmontoya

What feature best distinguishes one form of electromagnetic energy from another?

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Physics, 21.06.2019 22:00, connorgking

Why do electron microscopes have higher resolving power than light microscopes?

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Physics, 22.06.2019 14:40, kellypechacekoyc1b3

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?

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Physics, 22.06.2019 16:00, jlchandl

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?

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Physics, 23.06.2019 07:00, hockejoh000

Conventional hot-water heaters consist of a tank of water maintained at a fixed temperature. the hot water is to be used when needed. the drawback is that energy is wasted because the tank loses heat when it is not in use, and you can run out of hot water if you use too much. some utility companies are encouraging the use of on-demand water heaters (also known as flash heaters), which consist of heating units to heat the water as you use it. no water tank is involved, so no heat is wasted. a typical household shower flow rate is 2.50 gal/min (9.46 l/min ) with the tap water being heated from 51.0 ˚f (10.6 ˚c) to 120 ˚f (48.9 ˚c) by the on-demand heater. what rate of heat input (either electrical of from gas) is required to operate such a unit, assuming that all the heat goes into the water?