A .40 kg copper miniature of the Eiffel Tower your grandma gave you for Christmas is cooled from 22°C to 0°C because you forgot to take the ugly gift out of the car. If the Cp of copper is 380 J/kg·C°, what is the change in thermal energy?

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?

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) ! : )