How much heat is required to heat 4.05 - kg of copper from 69 °C to 227 °C in a time 5.75 minutes? The specific heat of copper is 0.093 cal /(g °C). Provide the answer in units of calories.

A factory worker pushes a 24.0 kg crate a distance of 8.0 m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and floor is 0.24.

1. 0.065 kg object is attached to a spring is a spring constant of Joo N/m. The other end of the spring to attached to a wall an Such a way that 3+ rests on a frict'sonless horizontal surface. so that it expreñiences sample Ă 4 exerted on the spring force harmorisc motson. a. tiow much work would be done on the spring to compress24 -by. 11 cm. b. Assuming that there so no friction. describe the energy conversaçons that take place, being sure to explain the location of maximum elastic potential energy and maximum k²netic energy. c. \Nhat will the speed of the object be when it's passing the point of being compressed by only 5.5 cm?. (Assume that the mass of the Spring negiigable.)

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