You accidentally drop a quarter into the hot coals of a campfire. You fish out the hot quarter with a pair of pliers and drop the quarter directly on top of a large 2 kg block of ice to cool it down. In what direction does heat flow:

There is no heat flow.
From the quarter to the block of ice

Aforce of 240.0 n causes an object to accelerate at 3.2 m/s2. what is the mass of the object?

Solar cell a produces 100 joules of energy, when a light source is shown on it for 3 minutes. solar cell b produces 200 joules of energy when the same light source is shown on it for 5 minutes. which solar cell works better? a) solar cell b, because it produces more energy. b) solar cell b, because it generates more power. c) solar cell a, because it produces energy quicker. d) solar cell a, because it generates a greater wattage. eliminate

A248-g piece of copper is dropped into 390 ml of water at 22.6 °c. the final temperature of the water was measured as 39.9 °c. calculate the initial temperature of the piece of copper. assume that all heat transfer occurs between the copper and the water. remember, the density of water is 1.0 g/m