1. a metal ball with mass m1 = 4 kg is heated to a temperature of θ1 = 186.7 degrees celsius, after which it is introduced into a calorimeter of negligible caloric capacity and containing a volume v2 = 6 liters of water at θ2 = 10 degrees celsius. after establishing the equilibrium, the temperature of the system is θ = 20 degrees celsius. neglecting heat losses, the specific heat of the ball is present.

2. a nickel body with mass m1 = 0.8 kg and initial temperature θ1 = 950 degrees celsius is introduced into a vessel with mass m2 = 50 kg water at temperature θ2 = 16 degrees celsius. let the equilibrium temperature be found. losses of any kind are neglected.

During physical science, ms. greene challenged her students to produce an energy transformation. james and jill wrapped a 4-inch nail with a coil of fifty turns of wire. they connected one end of the coil to one terminal of a knife switch. they connected the other terminal of the knife switch to the battery. finally, they connected the end of the coil to the other terminal of the battery. james held the tip of a 1-inch nail near the flat end of the 4-inch nail. jill closed the knife switch quickly and then opened it. the 1-inch nail was pulled toward the 4-inch nail. what is the best explanation of why the nail moved? a) electrical energy was converted to mechanical energy in the 1-inch nail. b) the 4-inch nail became an electromagnet and the magnetic force attracted the 1-inch nail. c) the electric current in the 4-inch nail was converted to mechanical energy in the 1-inch nail. d) the 4-inch nail had a positive charge and the 1-inch nail had a negative charge. opposites attracted.

What is a view of science and psychology that says the value of knowledge depends on its usefulness? a. pragmatism b. psychotherapy c. physiology

You charge a parallel-plate capacitor, remove it from the battery, and prevent the wires connected to the plates from touching each other. when you increase the plate separation, what happens to the following quantities?