A 0.600 kg toy car is powered by one 9V battery (9.00 V) connected directly to a small DC motor. The car has an effective energy conversion efficiency of 30.6 % , meaning that 30.6 % of the electric energy applied to the motor is converted into translational kinetic energy. After 5.69 s , the car, which is initially at rest, reaches a speed of 3.43 m / s . What is the average current supplied to the car's motor

The average current I supplied to the cars motor is 0.225 Amperes.

Explanation:

The mass of the toy car is given as, m = 0.6 kg

The toy car operates at a steady speed of, v =  3.43 m/s.

It achieves the steady speed after a time, t = 5.69 seconds.

The total kinetic energy of the car is given by,

E =

= 0.5 × 0.6 ×

= 3.53 Joules

Since the efficiency of the motor is 30.6%  = 0.306

The electrical energy equivalent is supplied to motor  = .

The electrical energy is given by P × t = I × V × t  = 11.54 Joules

P is the electric power where P = I × V where V is the voltage of the cell and is the average current, I.

Therefore we can write I × 9 × 5.69 = 11.54 Joules.

So the average current I = = 0.225 Amperes.

graph question answered .. you think better when you are relaxed and happy

which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table