Suppose you spend 30.0 minutes on a stair-climbing machine, climbing at a rate of 85 steps per minute, with each step 8.00 inches high. If you weigh 150 lb and the machine reports that 750 kcal have been burned at the end of the workout, what efficiency is the machine using in obtaining this result? ______________ % If your actual efficiency is 0.16, how many kcal did you really burn? _______________ kcal

Suppose you spend 30.0 minutes on a stair-climbing machine, climbing at a rate of 85 steps per minute, with each step 8.00 inches high. If you weigh 150 lb and the machine reports that 750 kcal have been burned at the end of the workout, what efficiency is the machine using in obtaining this result? % If your actual efficiency is 0.16, how many kcal did you really burn? _ kcal

Similar questions

What is the coefficient of performance of an ideal heat pump that has heat transfer from a cold temperature of -26.0°C to a hot temperature of 36.0°C?
In each cycle of its operation, a heat engine expels 6,500 J of energy and performs 1,700 J of mechanical work. A: How much thermal energy must be added to the engine in each cycle? __ J B: Find the thermal efficiency of the engine. __%
Suppose you spend 30.0 minutes on a stair-climbing machine, climbing at a rate of 75 steps per minute, with each step 8.00 inches high. If you weigh 150 lb and the machine reports that 700 kcal have been burned at the end of the workout, what efficiency is the machine using in obtaining this result? %If your actual efficiency is 0.17, how many kcal did you really burn? kcal
A‭ ‬heat‭ ‬pump‭ ‬has‭ ‬a‭ ‬coefficient‭ ‬of‭ ‬performance‭ ‬3.0‭.‭ ‬How‭ ‬much‭ ‬heat‭ ‬is‭ ‬exhausted‭ ‬to‭ ‬the‭ ‬hot reservoir‭ ‬when‭ ‬300‭ ‬kJ‭ ‬of‭ ‬heat‭ ‬are‭ ‬removed‭ ‬from‭ ‬the‭ ‬cold‭ ‬reservoir?
What is the coefficient of performance of an ideal heat pump that has heat transfer from a cold temperature of -23.0°C to a hot temperature of 42.0°C?
Any help with doublechecking my work would be great!
A refrigerator takes in 20 J of work and exhausts 50 J of heat. What is the refrigerator’s coefficient of performance?
Suppose you spend 30.0 minutes on a stair-climbing machine, climbing at a rate of 65 steps per minute, with each step 8.00 inches high. If you weigh 150 lb and the machine reports that 750 kcal have been burned at the end of the workout, what efficiency is the machine using in obtaining this result? %If your actual efficiency is 0.19, how many kcal did you really burn? kcal
A heat pump has a coefficient of performance equal to 4.85 and requires a power of 1.76 kW to operate. (a) How much energy does the heat pump add to a home in one hour? (b) If the heat pump is reversed so that it acts as an air conditioner in the summer, what would be its coefficient of performance?
Calculate the maximum theoretical efficiency of a heat engine that operates with the hot steam temperature at 390 °C and the cool steam temperature at 230°C. Please give your answer in two decimals, NOT percentage. For example, efficiency of 0.62. Your Answer: Answer
A power plant operates at a 25.0% efficiency during the summer when the seawater used for cooling is at 20.0°C. The plant uses 360°C steam to drive turbines. If the plant's efficiency changes in the same proportion as the ideal efficiency, what would be the plant's efficiency in the winter, when the seawater is at 10.1°C? ______ %
9) A heat pump is used to move heat from 10°C air outside, to a 22 °C air inside. The practical coefficient of performance of this pump is 4.1, and it uses 12000 J of electric energy. a) Find the energy this system adds to the house. b) Find the theoretical (maximum) coefficient of performance for this system. 5