Liquid water enters a valve at 150°c and 3 atm, and exhausts at 1 atm determine the exit temperature. 3. a blow dryer is rated at 1500 w and has a 1.5 in diameter outlet tube. air enters the device at 70°f and leaves at 150°f. neglecting the energy to run the fan, estimate the outlet air velocity.

the answer for sodium is 0.186

the answer for rubidium is 0.251

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied