What is the kinetic energy of an object that has a mass of 30 kilograms and moves with a velocity of 20 m/s?

a. 5,880 j
b. 2,940 j
c. 6,000 j
d. 12,000 j its c right?

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?

In a good thermo flask the main cause of heat loss is