Some machines, like the lever, generate a large mechanical advantage. Other machines, like a bicycle, actually have a mechanical advantage lower than 1. Does this mean that the machine is “useless” or not working? Explain your reasoning.

Adding more pulleys to a system of pulleys needed to lift an object. a. increases the force b. decreases the force c. increases the amount of work d. decreases the amount of work

Name the non metal condut electricity

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.