Juanita studies several free-body diagrams in which a normal force is shown. what is always true about a normal force in a free-body diagram?
a. it is opposite the weight.
b. it is perpendicular to a surface.
c. it is opposite the net force.
d. it is parallel to a surface.

Alivestock company reports that the mean weight of a group of young steers is 1100 pounds with a standard deviation of 93 pounds. based on the model n(1100,93) for the weights of steers, what percent of steers weigh a) over 1050 pounds? b) under 1300 pounds? c) between 1150 and 1250 pounds?

Agymnast dismounts off the uneven bars in a tuck position with a radius of 0.3m (assume she is a solid sphere) and an angular velocity of 2rev/s. during the dismount she stretches out into the straight position, with a length of 1.5m, (assume she is a uniform rod through the center) for her landing. the gymnast has a mass of 50kg. what is her angular velocity in the straight position?

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle