Power and Work Concepts

The video tutorial explains the relationship between power and work, introducing the concepts of average and instantaneous power. It provides examples to illustrate how power is calculated and discusses alternative formulas involving force and velocity. The tutorial includes problem-solving examples to demonstrate the application of these concepts in real-world scenarios.

What is the main factor that connects power and work?

• Velocity

• Time

• Distance

• Mass

In the example of lifting a weight, what is the power generated if 1000 joules of work is done in 10 seconds?

• 100 Watts

• 200 Watts

• 50 Watts

• 10 Watts

What is the SI unit for power?

• Pascal

• Newton

• Joule

• Watt

How is average power calculated?

• Velocity divided by time

• Force divided by time

• Mass divided by time

• Work divided by time

What alternative form can be used to express average power?

• Force times velocity

• Force times speed

• Mass times acceleration

• Distance times time

What is instantaneous power defined as?

• The instantaneous rate of doing work

• The average rate of work

• The force applied over time

• The total work done

Which mathematical operation is used to calculate instantaneous power?

• Integration

• Multiplication

• Addition

• Derivative

In the problem of a man climbing stairs, what is the power generated if he climbs 15 meters in 20 seconds with a mass of 70 kg?

• 800 Watts

• 515 Watts

• 600 Watts

• 700 Watts

What is the average power of a machine exerting a force of 100 Newtons at an angle of 42 degrees while moving at 4 m/s?

• 297 Watts

• 200 Watts

• 350 Watts

• 400 Watts

What is the instantaneous power of an 8 Newton force acting on a 16 kg body at the end of the third second?

• 10 Watts

• 8 Watts

• 12 Watts

• 14 Watts