1. What is a knife? A wheel and axle, a wedge, a pulley, or a lever?
2. What is an electric fan? A wheel and axle, a wedge, a pulley, or a lever?
3. A human arm works like a simple machine called a . The elbow works like a . A pulley; rope, a lever; fulcrum, a wheel and axle; axle, a pulley; wheel.

HELP

Acharge of 8.4x10^-4 c moves at an angle of 35 degrees to a magnetic field that has a field strength of 6.7x10^-3 t. if the magnetic force is 3.5 x10 ^-2 n, how fast is the charge moving?

Suppose a wheel with a tire mounted on it is rotating at the constant rate of 2.15 times a second. a tack is stuck in the tire at a distance of 0.373 m from the rotation axis. noting that for every rotation the tack travels one circumference (a) find the tack's tangential speed. (b) what is the tacks radial acceleration?

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2