Who will spend more electrical energy? 500W TV set in 30 mins, or 600W heater in 20 mins?​

Two polarizers are oriented at 40∘ to each other and plane-polarized light is incident on them. if only 16 percent of the light gets through both of them, what was the initial polarization direction of the incident light?

The law of the conservation of momentum says that the total momentum of any closed and isolated system cannot

Four friends, a, b, c, and d are standing varying distances away from a speaker which is producing sound waves.