e cost of electricity is 8¢ per kW·h, what does it cost to heat 160 L of water for a bath from 9.5°C (the temperature of the water entering the house) to 70°C?

Homework 3: Problem 9:   An electric coffeemaker has a 790-W heating element. The specific heat of water is 4.19 × 103 J/(kg⋅°C).   How long, in seconds, does it take the coffeemaker to heat 0.57 L of water from 18°C to 95°C, assuming all the heat produced by the heating element goes into the water?  Δt = ______

A 400 kg satellite is in a circular orbit at an altitude of 425 km above the Earth's surface. Because of air friction, the satellite eventually falls to the Earth's surface, where it hits the ground with a speed of 1.80 km/s. How much energy was transformed into internal energy by means of air friction? Need Help? Read It

One gram of water is vaporized into 1.65×103 cm3 when boiled at a constant pressure of 1.013×105⁢P⁢a. If the heat of vaporization at this pressure is Lv=2.256×106⁢J/k⁢g, what is the work done by the water when it vaporizes?

A container holding 4.20 kg of water at 20.0°C is placed in a freezer that is kept at -20.0°C. The water freezes and comes to thermal equilibrium with the interior of the freezer. What is the minimum amount of electrical energy required by the freezer to do this if it operates between reservoirs at temperatures of 20.0°C and –-20.0°C? (Latent heat of fusion of ice = capacity of water = 4186 J/(kg K), specific heat capacity of ice = 2100 J/(kg K)). 333,700 J/ kg, specific heat kJ