Work, Energy & Power: Solving 20 & 21 Problems

W * 60 s = 1320 kJIn summary, The conversation discusses the calculation of work done by a 22kW car engine in 60 seconds if it is 100% efficient. It also includes the calculation of work, power, and friction force in a scenario where a 5.0N force moves a 6.0 kg object along a rough floor at a constant speed of 2.5m/s for 25 seconds. The equations used in the attempts are W = F * d, P = E/t, and Work= Power x time. The answer for the work done by the car engine is 1320 kJ.
  • #1
McKeavey
30
0

Homework Statement


20. How much work can a 22kW car engine do in 60s if it is 100% efficient?

21. A force of 5.0N moves a 6.0 kg object along a rough floor at a constant speed of 2.5m/s.
a) How much work is done in 25s?
b) What power is being used?
c) What force of friction is acting on the object?



Homework Equations





The Attempt at a Solution


I would guess that I need to use W = F * d , but got nowhere.

W = F * d
P = E/t
got nowhere too..
 
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  • #2
Work= Power x time. so much work would the car do, since P =22 kW and t=60 s ?

since its 100 % efficient, all the energy given by the engine is used for moving the car
 

FAQ: Work, Energy & Power: Solving 20 & 21 Problems

What is the difference between work, energy, and power?

Work is defined as the product of force and displacement, while energy is the ability to do work. Power, on the other hand, is the rate at which work is done. In simpler terms, work is a measure of the effort put into a task, energy is the capacity to do work, and power is the speed at which work is done.

How do you calculate work?

Work is calculated by multiplying the magnitude of the force applied by the distance over which the force is applied. In other words, work = force x distance. The unit of work is joules (J).

What is the relationship between work, energy, and power?

Work and energy are directly related, as work is the transfer of energy from one object to another. Power is the rate at which work is done or energy is transferred. Therefore, the greater the power, the faster work can be done or energy can be transferred.

How is work, energy, and power measured?

Work is measured in joules (J), energy is also measured in joules (J), and power is measured in watts (W). One watt is equal to one joule of work per second.

How can the concepts of work, energy, and power be applied in real-life situations?

The concepts of work, energy, and power have many applications in everyday life. For example, understanding the relationship between these concepts can help in designing more efficient machines, calculating the energy usage of household appliances, and optimizing energy consumption in industries. These concepts also play a crucial role in the fields of engineering, physics, and environmental science.

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