A tank containing 10 kg of salt dissolved in 1000 L of water has two salt solutions pumped in. The first solution of 0.2 kg salt/L is pumped in at a rate of 20 L/min and the second solution 0.05 kg salt/L is pumped in at a rate of 5 L/min. The tank drains at 25 L/min. Solve the salt concentration as a function of time t. 8. The liquid base of an ice cream has an initial temperature of 90 oC before it is place in a freezer with a constant temperature of -20 oC. After 1 hour, the temperature of the ice-cream base has decreased to 55 oC. Solve the temperature of the ice cream as a function of time t.

For me a person with a phd and who knows what there talking about.i know the chances of a radiation leak is low but if it does the area within a 96.3 mile radius would be unusable because of contamination

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j

Ithink c because you have to work to become goid