If the forces on an object are balanced, how is the object moving?

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

The rigid beam is supported by the three suspender bars. bars ab and ef are made of aluminum and bar cd is made of steel. if each bar has a cross-sectional area of 450 mm2, determine the maximum value of p if the allowable stress is (σallow)st = 200 mpa for the steel and ( σallow)al = 150 mpa for the aluminum. est = 200 gpa and eal = 70 gpa.

How can you increase the strength of an electromagnet?