A diesel engine operating on an isostatic heating cycle has a compression ratio of 20. The pre-compression air temperature is 20C and the pressure is 95 kPa. if the maximum temperature during the motor cycle does not exceed 2200K. Determine the full cycle thermal efficiency.

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.