Question

(a) Fig. 6.1 shows an elephant pushing a log up a hill.

(i) State the two quantities that need to be measured to calculate the work done by the elephant on the log.
1 ……………………………………………………………………………………………………………………….
2 ……………………………………………………………………………………………………………………….
(ii) State the form of energy gained by the elephant as it moves up the hill at constant speed.
…………………………………………………………………………………………………………………….
(b) The elephant has a mass of 3500kg and the log has a mass of 180kg.
(i) Calculate the combined weight of the elephant and the tree trunk.
The gravitational field strength, g, is 10N/kg.

                                                                weight = ……………………………………………… N 

(ii) The volume of the elephant is 3.4m$^{3}$.
Calculate the average density of the elephant.

                                                   density = ………………………………………. kg/m$^{3}$

(c) A scientist takes some measurements of the elephant.
Table 6.1 shows the measurements taken.
Complete Table 6.1 with suitable units for these measurements.
One has been done for you.