For work to be done on an object, * (a) a force must be exerted, but the object must remain stationary.

(b) a force must be exerted on an object, but it doesn't have to move.

(c) an object must move, but no force is required.

(d) an object must move some distance as a result of a force.

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In order for the bug to fly through the air a force has to push the bug forward. identify this force. how does the bug produce

Free runners jump long distances and land on the ground or a wall. how do they apply newton’s second law to lessen the force of impact?

Steam is generated in a boiler of a cogeneration plant at 10 mpa and 450°c at a steady rate of 5 kg/s. in normal operation, steam expands in a turbine to a pressure of 0.5 mpa and is then routed to the process heater, where it supplies the process heat. steam leaves the process heater as a saturated liquid and is pumped to the boiler pressure. in this mode, no steam passes through a condenser, which operates at 20 kpa. (a) determine the power produced in the turbine and the rate at which process heat is supplied in this mode. (b) determine the power produced in the turbine and the rate of process heat supplied if only 60 percent of the steam is routed to the process heater and the remainder is expanded to the condenser pressure. (3.32 mw; 9.69 mw; 4.25 mw; 5.82 mw)