Work and Energy

Question 27: Define watt. Express kilowatt in terms of joule p

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Question 26: How is the power related to the speed at which a body can be lifted? How many kilograms will a man working at the power of 100 W, be able to lift at constant speed of

1 m s^{-1}

vertically? (

g = 10 m s^{-2}

)

Question 27:
Define watt. Express kilowatt in terms of joule per second. A 150 kg car engine develops 500 W for each kg. What force does it exert in moving the car at a speed of

20 m s^{-1}

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Question 27:
Define watt. Express kilowatt in terms of joule per second. A 150 kg car engine develops 500 W for each kg. What force does it exert in moving the car at a speed of $20 m s^{-1}$ ?

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Description: [Solved] Question 27:Define watt. Express kilowatt in terms of joule per second. A 150 kg car engine develops 500 W for each kg. What force does it exert in moving the car at a speed of 20ms–1? - Science Exemplar

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Updated on: Jan 31, 2023

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Text solutionVerified

Answer: One watt is defined as one joule of work done in one second. It is the SI unit of power.
One kilowatt in terms of joule per second,

1 kilowatt = 1000 watt = 1000 \times \frac{1 joule}{1 second} = 1000 Js^{- 1}

Given: Mass of car engine,

m = 150 kg

Power per kg = 500 W

Speed of moving car,

v = 20 ms^{- 1}

Total power developed by the car engine =

150 \times 500 = 75000 W

Force developed in moving the car:

P = F \times v 75000 = F \times 20

\Rightarrow = F = \frac{75000}{20} 3750 N

Hence, the force exerted by the engine to move the car is 3750 N.

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Question 26: How is the power related to the speed at which a body can be lifted? How many kilograms will a man working at the power of 100 W, be able to lift at constant speed of

1 m s^{-1}

vertically? (

g = 10 m s^{-2}

)

Question 27:
Define watt. Express kilowatt in terms of joule per second. A 150 kg car engine develops 500 W for each kg. What force does it exert in moving the car at a speed of

20 m s^{-1}

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Question Text	Question 27: Define watt. Express kilowatt in terms of joule per second. A 150 kg car engine develops 500 W for each kg. What force does it exert in moving the car at a speed of $20 m s^{-1}$ ?
Updated On	Jan 31, 2023
Topic	Work and Energy
Subject	Science
Class	Class 9
Answer Type	Text solution:1 Video solution: 1
Upvotes	70
Avg. Video Duration	6 min

Question 27:
Define watt. Express kilowatt in terms of joule per second. A 150 kg car engine develops 500 W for each kg. What force does it exert in moving the car at a speed of $20 m s^{-1}$ ?

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Question 27:Define watt. Express kilowatt in terms of joule per second. A 150 kg car engine develops 500 W for each kg. What force does it exert in moving the car at a speed of 20ms–1?

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Question 27:
Define watt. Express kilowatt in terms of joule per second. A 150 kg car engine develops 500 W for each kg. What force does it exert in moving the car at a speed of $20 m s^{-1}$ ?