A heating coil of resistance 20 ohms is connect to a 220V to boil a certain quantity of water in a container of heat capacity 100J/K for 2minutes. If the initial temperature of the water is 40°C, calculate the mass of the water in the container. [Take S. H.C of water 4200J/Kg/K]​

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?

Most short-period comets do not have randomly oriented orbits because