What occurs when a swimmer pushes through the water to swim?
a)the swimmer pushes the water forward.
b)the water exerts a reaction force on the swimmer.
c)the swimmer exerts a reaction force on the water.

An object with initial temperature 130 ∘ f is submerged in large tank of water whose temperature is 50 ∘ f . find a formula for f ( t ) , the temperature of the object after t minutes, if the cooling constant is k = − 0.2 . remember newton's law of cooling (the rate of change of temperature with respect to time is equal to k times the difference between the temperature of the object and the surrounding temperature) ! : )