Two forces are applied to a wheel with a radius of 1 m. The 50 N force is perpendicular to the wheel and paints up. The 20 N force is perpendicular to the wheel and points down. What is the torque on the wheel? A: 30 N m
B: 70 N m
C: -30 N m
D: -70 N m

Most energy in an ecosystem comes originally from_

Oxygen and hydrogen gas are at the same temperature t.what is the ratio of kinetic energies of oxygen molecule and hydrogen molecule if oxygen is 16 times heavier than hydrogen.

Atriangle with equal sides of length 10 cm has -2.5-nc charged objects at each corner. part a determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. horizontally rightward vertically downward vertically upward horizontally leftward