The beam shown is balanced at its midpoint. The weight of the beam is 40 N. Calculate the unknown force Z, and the length of the beam. The answer is (90N and 1.5m) I know how to get the length but i don’t hope how to get the force :(

Amarble, a bowling ball, a basketball, and a baseball are rolling across the floor at 10 m/s. which one has the greatest kinetic energy? the marble the bowling ball the basketball the baseball

Distinguish between linear momentum and angular momentum

Consider a production line with five stations. station 1 can produce a unit in 9 minutes. station 2 can produce a unit in 10 minutes. station 3 has two identical machines, each of which can process a unit in 12 minutes (each unit only needs to be processed on one of the two machines. station 4 can produce a unit in 5 minutes. station 5 can produce a unit in 8 minutes. which station is the bottleneck station?