Please help Physics problem?
A building is being knocked down with a wrecking ball, which is a big metal sphere that swings on a 10-m-long cable. You are (unwisely!) standing directly beneath the point from which the wrecking ball is hung when you notice that the ball has just been released and is swinging directly toward you
How much time do you have to move out of the way?
Comments
If the ball is directly above you and released it is not swinging. If it is swinging you are safe.
If the ball is stationary on a 10m cable but how high above you is it when it is released?
Period of a pendulum is T = 2π√(L/g)
Find T using L=10m and g = 9.8m/s²
From the release point till the cable is vertical is 1/4 of a cycle. So the time taken is T/4. Round to 2 sig. figs.
Depends on the height. And do you mean falling when you said " the ball has just been released and is swinging directly toward you"