Dan and Louis both weighed 90 lbs. Both climbed a hill which rose 60 feet. It took Dan 10 minutes and Louis 4 minutes. How much work did Dan and Louis do? Dan: 540 foot-pounds, Louis: 1200 foot-pounds Dan: 5400 foot-pounds, Louis: 5400 foot-pounds Dan: 900 foot-pounds, Louis: 360 foot-pounds

The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. assume that the membrane acts like a parallel plate capacitor in which the effective charge density on the inner and outer walls has a magnitude of 7.0 × 10-6 c/m2. (a) what is the magnitude of the electric field within the cell membrane? (b) find the magnitude of the electric force that would be exerted on a potassium ion (k+; charge = +e) placed inside the membrane.

Un jugador de beisbol batea un foul recto en el aire. la pelota deja el bate con una rapidez de 120 km/h. en ausencia de resistencia del aire. ? cual sera la rapidez de la pelota cuando la atrape el catcher

While the change in blank will remain the same during a collision, the force needed to bring an object to a stop can be blank if the time if collision is blank