How much energy is required to raise the temperature of a 2.50 kg object with a specific heat capacity of 800J/(kg °C) by 30.0°C?

To do work, this truck uses energy stored in chemical fuel and an electrical battery. how much total energy does this truck put out?

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.

Aspacecraft that renters the earth’s atmosphere drastically slows down. the amount of kinetic energy the spacecraft has as it reenters the earths atmosphere