A 3.50-kg mass hangs from a wire. Find the tension in the wire so that there is a net force of ___. (a) 5.00 N up (b) 5.00 N down

explanation:

the masses of the objects and the distance between them

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray