Adistance of 1.0 × 10^−2 meter separates successive
crests of a periodic wave produced in a shallow
tank of water. if a crest passes a point in the tank
every 4.0 × 10^−1 second, what is the speed of this
wave?
(1) 2.5 × 10^−4 m/s (3) 2.5 × 10^−2 m/s
(2) 4.0 × 10^−3 m/s (4) 4.0 × 10^−1 m/s

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) ! : )