It takes 90 seconds to fill a cars petrol tank The petrol tank has a capacity of 45 L The pump has to lift the petrol 4m from the storage tank underneath the forecourt. 1 L of petrol weighs 6.8N How much work does the pump do in pumping the petrol?
VERIFIED
Hubert Kaluzny
Second year Imperial Computing student, with previous teaching experience.
In order to fill the tank completely the pump wouldโve had to lift 45 L of petrol by 4m. We can calculate this using the gravitational potential energy formula: E = mgh where m is the mass, g is acceleration due to gravity and h is the height difference. Since the question told us that 1 litre of petrol weighs 6.8N, the total weight of the petrol is 45 * 6.8 = 306N note that weight = mg so we now can plug this value into the formula: E = 306 * 4 = 1224 Joules
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