What are the forces on a feather falling down gravity normal force friction push force pull force?

How are calculation for velocity and speed different

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) ! : )

What happens to the vapor pressure of a substance when its surface area is increased at constant temperature?