13 In Assign
an experiment with Hare's apparatus to
determine the relatiue density of alchol, he heights
of alcohol and noter, Heleng column were found to
experiment with alcohol and water, the length of alcohol
Column was to.
Scm,
(b) the new height of the water column
(a) find the relative density

Which property of fossils allow scientists to determine the relative rock ages..

During physical science, ms. greene challenged her students to produce an energy transformation. james and jill wrapped a 4-inch nail with a coil of fifty turns of wire. they connected one end of the coil to one terminal of a knife switch. they connected the other terminal of the knife switch to the battery. finally, they connected the end of the coil to the other terminal of the battery. james held the tip of a 1-inch nail near the flat end of the 4-inch nail. jill closed the knife switch quickly and then opened it. the 1-inch nail was pulled toward the 4-inch nail. what is the best explanation of why the nail moved? a) electrical energy was converted to mechanical energy in the 1-inch nail. b) the 4-inch nail became an electromagnet and the magnetic force attracted the 1-inch nail. c) the electric current in the 4-inch nail was converted to mechanical energy in the 1-inch nail. d) the 4-inch nail had a positive charge and the 1-inch nail had a negative charge. opposites attracted.

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative