If 2kg of water is to be heated from 24.0°C to 100°C to make a cup of tea, how much heat must be added? The specific heat of water is 4180 J/kg°C

Please show your work

If the speed of a particle triples ,by what factor does its kinetic energy increase?

Which is special about a dc circuit ? a. it has both series and parallel components b. it has only series or only parallel components c. charge moves in a single direction d. charge moves back and forth quickly

The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?