college

find the volume of solid bound by planes x=0 y=0 z=0 and x+y+z=7

The question has three parts, it looks like a lot but it is just description, trying to understand relationships. 1. You toss a coin straight up into the air. Sketch on the axes below the velocity-time acceleration-time graphs of the coin from the instant...

An elevator weighting 2500 N ascends at a constant speed of 8 m/s. How much power must the motor supply to do this?

My question is two parts How many calories of heat energy would it take to heat 200 mL of water from 20C to 80C? a) How long would it take to heat the water in the previous question using a heater with a power rating of 50W? Looking for equations to solve...

Is it easier to exchange heat between a thermometer and air or between a thermometer and water.

You have a mass of hot water at 90 C and twice the mass of cool water at 10C. The hot and cold water are mixed together. Will the final temperature be midway between 10C and 90C, closer to 90C, or closer to 10C? Explain your reasoning.

store mixes a Brazilian coffee worth worth $10 per kilogram and a turkish coffee worth $13 per kilogram. The mixture is to sell for $12 per kilogram. Find out how much of each should be used to make a 420-kilogram mixture. my calculations all came out sup...

that makes sense i just didn't think it could be that easy

In response to lobu6058, the deltaHf value for liquid water is correct IF we're assuming standard conditions for this reaction. Specifically, that it is taking place at 25C. Because water is a liquid at 25C, the deltaHf value should be for liquid water. N...