Debbie removed the 5g of aluminium rivets and put 5g of iron nails into the cup.

the paper cup moved down more with the 5g of iron nails than with the aluminium rivets. give the reason for this.

(4 marks)

Power can be defined as a. the distance over which work was done. b. how much work can be done in a given time. c. all the work in an given area. d. the energy required to do work.

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?

Explain what will happen if decomposers were apsent from a forest ecoysystem.