A champion weight lifter raises a 240 kg barbell a distance of 2.1 m. How much potential energy has the barbell gained?

The crank oa rotates in the vertical plane with a constant clockwise angular velocity ω0 of 5.6 rad/s. for the position where oa is horizontal, calculate the force under the light roller b of the 10.6-kg slender bar ab.

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

Aperson walks first at a constant speed of 4.89 m/s along a straight line from point a to point b and then back along the line from b to a at a constant speed of 2.95 m/s. what is the average speed over the entire trip?