Suppose we want to use a hot brick at tbrick= 400 k to power an engine which is in contact with another thermal reservoir with tres=300 k. at what temperature of the brick will the engine stop doing work?

Observations show that interstellar clouds can have almost any shape and

Click the game tab at the bottom of the simulation and select level 1. (there is no seesaw balance for this part of the activity.) balance the first equation, and click check to see if you got it right. if you can’t balance it in the first try, you can try again. work through the five equations for level 1. click continue to go on to level 2, and later level 3. each level is more difficult than the one before. keep trying until all the equations are balanced. in one or two sentences, describe how you did in the balancing game. in a few more sentences, explain one strategy you learned for balancing more complex equations.

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?