Why a small car can stop easier than an 18 wheeler while traveling at 70 mph down the interstate?

Which quantities are scalars? choose all that apply a.distance b.speed c. acceleration d.velocity

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.

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?