Jeff is a landscaping contractor and lifts a rock weighing 600 pounds by wedging a board under the rock. jeff weighs 150 pounds and puts all of his weight on the lever. how much mechanical advantage did the lever provide to jeff in lifting the rock? a) 0 b) 2 c) 4 d) 8

Agas expands from an initial volume of 0.040 m^3 and an initial pressure of 210 kpa to a final volume of 0.065 m^3 while its temperature is kept constant. how much work is done by the system?

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z

Two pans of a balance are 24.1 cm apart. the fulcrum of the balance has been shifted 1.33 cm away from the center by a dishonest shopkeeper. by what percentage is the true weight of the goods being marked up by the shopkeeper? assume the balance has negligible mass. answer in units of %.