The energy consumption of somebody who is climbing stairs is 0.1287 kcal/min per kg of corporal mass. calculate the power, in watts, of somebody of 79kg who is climbing the stairs.

9.98 kg of r-134a at 300 kpa fills a rigid container whose volume is 14 l. determine the temperature and total enthalpy in the container. the container is now heated until the pressure is 600 kpa. determine the temperature and total enthalpy when the heating is completed. use data from the steam tables.

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?

Match each type of lever with the correct diagram. 1. first-class 2. third-class 3. second-class