Two objects in space are separated by a distance of 5.903×106 m. One object has a mass of 2.8×104 kg, while the other has a mass of 8.83×1020 kg. Calculate the force of gravity between these two objects.

If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.

Which of the following is the largest disadvantage of about half of the electricity in the united states comes from burning