an electrical energy supplied to a toy car was 240 joules.If the car weighing 40N moved through a distance of 5m,calculate the efficiency
W = F*d = 40 * 5 = 200 Joules.
Eff. = (200 / 240)*100% = 83.3 %.
To calculate the efficiency of the toy car, we need to compare the useful output energy to the input energy. The efficiency is given by the formula:
Efficiency = (useful output energy / input energy) * 100
In this case, the input energy is the electrical energy supplied to the toy car, which is given as 240 joules.
To find the useful output energy, we need to calculate the work done by the car. The work done is given by the formula:
Work = force * distance
In this case, the force acting on the car is its weight, which is given as 40N. The distance traveled by the car is 5m.
Work = 40N * 5m = 200 joules
Now, we can calculate the efficiency using the formula:
Efficiency = (useful output energy / input energy) * 100
= (200 joules / 240 joules) * 100
≈ 83.33%
Therefore, the efficiency of the toy car is approximately 83.33%.