Find the efficiency of a motor vehicle engine if at a speed of 45km/ h

the engine consumes 12 litres of

petrol per

100km

and develops a power of

16hp

. The density of the petrol is

0.8g / cm . The heat

value of petrol is

45kJ / g

gpe = mass x gravity constant x height or… gpe = mgh

where… mass: measured in kilograms (kg)

gravity: gravity constant on earth = 10.00 m/s2

height: measured in meters (m)

gpe: measured in joules (j) or kilojoules (kj)

how do you solve gpe?

gravitational potential energy (gpe) is the energy an object has because of its position above the. ground.

gpe = mass x gravity constant x height or… gpe = mgh.

mass:

note: to earn full marks when solving science word problems, you must show your work:

formula.

example:

given values:

mass = 0.3 kg.

hot magma rises and pushes up toward the lithosphere, and as it cools it cycles back down toward the core to be heated again.