21. What is wrong with the following expressions? How can you correct them? (a) C = AB, (b) C = AB, (C) C = A B, (d) C = AB, (0) C +2Ã = B, (0 C = A x B, (g)Ã B = A * B, (h) C = 2A - B, 0 C = A/B,
and () C = A/B

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied.

The earth remains in orbit around the sun due to the force of gravity. how does the force of gravity exerted by the sun on the earth compare to the force of gravity exerted by the earth on the sun?

Which configuration would produce an electric current? a) rotate a coil of copper wire between two magnets. b) connect a wire between a copper and zinc strip sitting in a beaker of water. c) connect a wire to the (+) positive end of a battery and the other end to a light bulb. d) connect a wire to the negative end of a battery and the other end to a light bulb.