When you hit a nail into a board using a hammer the head of the nail gets warm. in terms of kinetic and thermal energy describe why you think this happens?

Avoltage source vs = 10 v is in series with a resistor of 10 kohm. if the source transformation theorem is applied, what will the value of the current source be in ma ?

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?

Discuss how the hardness or softness of the landing surface is related to the time required to stop the egg