# Flywheel Kinetic Energy in Delivery Trucks

• BuBbLeS01
In summary, Delivery trucks in Europe use rotating flywheels charged with electric motors to operate. The flywheel in question is a solid homogenous cylinder with a mass of 550 kg and a radius of 0.65 m, rotating at a top speed of 960 rad/s. The kinetic energy of the flywheel after charging is 5.35 x 10^7. If the average power requirement is 9.3 kW, the truck can operate for approximately 33 minutes before needing to be charged again.
BuBbLeS01

## Homework Statement

Delivery trucks that operate by making use of energy stored in a rotating flywheel have been used in Europe. The trucks are charged by using an electric motor to get the flywheel up to its top speed of 960 rad/s. One such flywheel is a solid homogenous cylinder, rotating about its central axis, with a mass of 550 kg and a radius of 0.65 m. What is the kinetic energy of the flywheel after charging?

If the truck operates with an average power requirement of 9.3 kW, for how many minutes can it operate between charging?

K = 1/2Iw^2
I = 1/2mr^2

## The Attempt at a Solution

K = 1/2 * (.5 * 550 * .65^2) * 960^2 = 5.35 x 10^7
I a, getting a really huge number I wanted to make sure I am doing it right.

Well convert radians per second to metres per second.

Then K = 0.5 (m) (v)^2

Your calculations for the kinetic energy of the flywheel after charging are correct. The large number is expected as the flywheel has a high rotational speed and a significant mass. This stored energy can then be used to power the delivery truck.

To calculate the operational time of the truck, we can use the equation P = E/t, where P is the power requirement, E is the energy stored in the flywheel, and t is the operational time. Rearranging the equation, we get t = E/P.

Plugging in the values, we get t = (5.35 x 10^7 J) / (9.3 x 10^3 W) = 5753 seconds or approximately 1.6 hours. This means that the truck can operate for 1.6 hours between charging, assuming it maintains an average power requirement of 9.3 kW.

## What is flywheel kinetic energy in delivery trucks?

Flywheel kinetic energy refers to the energy stored in a rotating flywheel, which is used to power the vehicle's movement. In delivery trucks, this energy is typically generated through the truck's braking system and stored in the flywheel. This stored energy can then be used to accelerate the truck, reducing the strain on the engine and saving fuel.

## How does flywheel kinetic energy work in delivery trucks?

In delivery trucks, the flywheel is connected to the vehicle's drivetrain and rotates at high speeds. When the truck brakes, the kinetic energy of the moving vehicle is transferred to the flywheel, causing it to spin. This energy is then stored in the flywheel and can be used to power the truck's movement when needed.

## What are the benefits of using flywheel kinetic energy in delivery trucks?

There are several benefits to using flywheel kinetic energy in delivery trucks. Firstly, it can help improve the truck's fuel efficiency by reducing the strain on the engine. This can also lead to lower emissions and a greener transportation system. Additionally, using flywheel energy can also reduce brake wear and tear, resulting in lower maintenance costs for the truck.

## Are there any drawbacks to using flywheel kinetic energy in delivery trucks?

One potential drawback of using flywheel kinetic energy in delivery trucks is the added weight and space required for the flywheel system. This can limit the amount of cargo the truck can carry and may also increase the overall cost of the vehicle. Additionally, the flywheel system may require regular maintenance and replacement, which can also add to the operational costs.

## How does flywheel kinetic energy compare to other alternative energy sources in delivery trucks?

Flywheel kinetic energy is just one of many alternative energy sources being explored for use in delivery trucks. Compared to other options such as electric or hydrogen-powered vehicles, flywheel energy may have a lower cost and be easier to implement. However, it may also have limitations in terms of range and the amount of energy it can store. Ultimately, the best alternative energy source for delivery trucks will depend on various factors such as cost, efficiency, and infrastructure availability.

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