Aperson wants to use a lever to lift a dumpster weighing 4200 n.4200 n. the lever is arranged so that it is approximately horizontal and makes contact below the dumpster's center of mass at a distance of 0.30 m0.30 m from the lever's pivot. about how much torque will the dumpster exert on the lever?

1260 Nm

Explanation:

As one end of the lever makes contact at the point right below the dumpster center of mass and has a distance of 0.3 m to the lever pivot point, plus the fact that the level is also approximately horizontal, we can safely assume that the dumpster gravity is directly perpendicular to the level.

This would make the torque caused by the dumpster gravity on the level is

T = LF = 4200*0.3 = 1260 Nm

d) physical means can be used to separate the components of air.

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.