A mechanic is trying to loosen a nut with a wrench, but it is stuck. What could the mechanic do to help loosen the nut? (Hint: This is a wheel and axle situation.)
A. Use a heavier wrench.
B. Use a lighter wrench.
C. Use a longer wrench.
D. Use a shorter wrench.

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

Part of a control linkage for an airplane consists of a rigid member cb and a flexible cable ab. if a force is applied to the end b of the member and causes it to rotate by θ = 0.5°, determine the normal strain in the cable. originally the cable is unstretched.