1. A 20 litre tank is initially full of fresh water. A brine solution of concentration 0.5 flows in at a rate of 4. The tank is well mixed and the salt water flows out at the same rate of 4. Create the DE that models the min min salt in the tank and solve it. How much salt is in the tank 10 minutes after the flow starts?

The kinetic energy E of an object varies jointly with the object’s mass m and the square of the object’s velocity v . An object with a mass of 50 kilograms traveling at 16 meters per second has a kinetic energy of 6400 joules. What is the kinetic energy of an object with a mass of 70 kilograms traveling at 20 meters per second?

Find the unknown value. 27. y varies jointly with x and the cube root of 2. If when x=2 and z=27,y=12, find y if x=5 and z=8.

Find the intensities of earthquakes whose magnitudes are (a) R=6.0 and (b) R=7.9.