The physical quantity which have both magnitude and direction is a vector?why?

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

Asmall object with mass 0.200 kg swings back and forth on the lower end of a light rope that is 3.00 m long. the upper end of the rope is attached to the ceiling. as the object swings through its lowest position, where the rope is vertical, the speed of the object is 5.80 m/s. at this point in the motion, what is the tension in the rope? (use g = 9.80 m/s2.)

Which of the following are guidelines to follow for obtaining accurate observations