2. Make the correct calculations needed for finding information to build a density column using the three substances below. Then explain how to assemble the
column. Also explain why the column should be assembled in this way.
10.0 ml of dawn was found to have a mass of 12.37 g
20.0 ml of styling gel was found to have a mass of 22.25 g
4.25 g of moose was found to occupy 5.0 ml of volume.
I don't understand what it is asking.. Please help..

Which fators influence ocean currents

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

Search coils and credit cards. one practical way to measure magnetic field strength uses a small, closely wound coil called a search coil. the coil is initially held with its plane perpendicular to a magnetic field. the coil is then either quickly rotated a quarter-turn about a diameter or quickly pulled out of the field. (a) derive the equation relating the total charge q that flows through a search coil to the magnetic-field magnitude b. the search coil has n turns, each with area a, and the flux through the coil is decreased from its initial maximum value to zero in a time ∆t. the resistance of the coil is r, and the total charge is q = i∆t, where i is the average current induced by the change in flux. (b) in a credit card reader, the magnetic strip on the back of a credit card is rapidly “swiped” past a coil within the reader. explain, using the same ideas that underlie the operation of a search coil, how the reader can decode the information stored in the pattern of magnetization on the strip. (c) is it necessary that the credit card be “swiped” through the reader at exactly the right speed? why or why not?