A 50 kg wood block is being dragged at an angle of 180 above horizontal across a wood floor, where the coefficient of friction is 0.5. The dragging force is 75 N. Find the acceleration of the block.

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) ! : )