Asteel container of mass 160 g contains 23.0 g of ammonia, nh3, which has a molar mass of 17.0 g/mol. the container and gas are in equilibrium at 16.0°c. how much heat (in j) has to be removed to reach a temperature of −20.0°c? ignore the change in volume of the steel. (the specific heat of steel is 452 j/(kg · °c). enter the magnitude.)

Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)

You are about to open a container of soy milk but notice that there are instructions to “shake well before serving.” the soy milk is most likely a

Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=