A magnetic field. that's how people make magnets, by wrapping copper wire around whatever they want to be magnetic then running electricity through the wire. it works on revers to make electricity.
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The average speed of Frank's car is 2 m/s and the average speed of Noah's car is 1.8 m/s.
<u>Explanation:</u>
Average speed is the measure of total distance covered at different time period. Since, the formula used for calculating the average speed is the ratio of total distance covered by each car to the time taken to cover that distance.
As there is only one set of data i.e., distance and time, the average speed will be equal to the speed of the car.
So in this case, the total distance covered by franks car is 300 cm = 3 m in 1.5 s. Then, the average speed will be


Similarly, the average speed of Noahs car which rolled a distance of 360 cm = 3.6 m in time 2 s, will be

Thus, the average speed of Frank's car is 2 m/s and the average speed of Noah's car is 1.8 m/s.
b the money supply divided by nominal GDP
Explanation:
The velocity of money is nothing but the ratio of GDP and money supply. In other words, velocity of money also tells us the rate at which money is being exchanged in a country. The constant velocity says that the growth rate in the economy is zero. Velocity of money depends on the rate at which money is spent for finished goods and services per unit time. It is more when spending of money is more and it decreases when people spend less money. The total amount of money that is in circulation or that exists in a country is know as money supply.