Question

1A) Using the specific heat of steel as 420 j/kg * kelvin. Find the amount of heat required to warm a 10kg sample of steel from 37˚C to 77˚C.

1B) If a 3m wide pipe carries water at a rate of 2m/s and the pipe is reduced to .1m wide pipe, what will be the resulting velocity of the water?

1C) If a 2kg hockey puck moving on a frictionless surface at a velocity of 3m/s and moving on the x axis collides with a 4kg hockey puck travelling at 2m/s and moving on the y axis prior to collision collide, what is the final velocity and direction of each of the pucks if the 2kg puck is travelling at -1.5 m/s at 30˚ above the horizontal? (assume they don’t stick together) Draw a before and after picture.

1D) If a 20kg bird is flying east at 17m/s and eats a stationary mosquito of .01kg what is the resulting velocity?

Answer 1