Snigdha filled a large metal bowl with water, and then she put a waterproof electric heater in the bowl. She let the heater heat the water for 15 minutes. By the end of the 15 minutes, the electric heater had used 90 kJ of electric energy, but the thermal energy of the water had only increased by 82 J. Why were these two amounts of energy different?

Astone is thrown with a speed v0 and returns to earth, as the drawing shows. ignore friction and air resistance, and consider the initial and final locations of the stone. which one of the following correctly describes the change δpe in the gravitational potential energy and the change δke in the kinetic energy of the stone as it moves from its initial to its final location? options a.δpe = 0 j and δke = 0 j b.δpe is positive and δke is negative c.δpe = 0 j and δke is positive d.δpe is negative and δke is positive e.δpe = 0 j and δke is negative