Recent content by kingdomxiii

So I calculated the potential energy to be 294 Joules. So would the increase in kinetic energy equal 30?

Homework Statement Assuming no heat is transferred to or from the surroundings, how much does the temperature of a river rise in going over a 30 m falls? (assume the velocity of the water is the same above and below the falls)Homework Equations Δl = αlΔTThe Attempt at a Solution H = 0 and l =...

Great! Thank you Chestermiller and gneill!

Right, so I got 83.38 kJ/(333 kJl/kg) = .25 kg. So .25 kg. Is this right?

Sorry, i meant the 83.38 kJ

gneill: Ok, so the formula that pertains to that phase is ΔQ = Lm. I know that L is the latent heat of fusion for water so it is 333 kJ/kg. Would the change in heat be the 3.38 kJ? Chestermiller: I found the change in heat for the lemonade form 20-0 °C to be 83.38 kJ.

A phase change occurs, but the problem does not give the mass of the ice.

Homework Statement Ice at 0°C is added to a 1 kg of lemonade cooling it from 20°C to 0°C. How much ice melts? (The heat capacity of lemonade equals that of water.)Homework Equations Q = mcΔTThe Attempt at a Solution Found the heat in of the lemonade to the ice... = 83.38 kJ and don't know...