If a person walks forwards five meters but then moves back one meter, what is their displacement?

Pls pls pls pls ! describe, in your own words, how you found the epicenter of the earthquake.

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

Aheavy piece of hanging sculpture is suspended by a90-cm-long, 5.0 g steel wire. when the wind blows hard, the wire hums at its fundamental frequency of 80hz. what is the mass of the sculpture?