Along rope was tightened around the earth equator (assume earth the perfect sphere or radius ≈6,). then the rope extended by 1 meter and lifted, uniformly around the equator. what if the rope was pinched at one point and pulled up as high as possible: what tallest person could fit under the rope?

Aball is thrown from the top of a building with an initial velocity of 21.9 m/s straight upward, at an initial height of 51.6 m above the ground. the ball just misses the edge of the roof on its way down, as shown in the figure. (a) determine the time needed for the ball to reach its maximum height. (b) determine the maximum height. (c) determine the time needed for the ball to return to the height from which it was thrown, and the velocity of the ball at that instant. (d) determine the time needed for the ball to reach the ground. (e) determine the velocity and position of the ball at t = 5.35 s.