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CBSE Class 9 Answered

why is work not a vector quantity?
Asked by | 20 Dec, 2011, 04:46: PM
answered-by-expert Expert Answer
Work done is the dot product of force vector and displacement vector. since dot product of two vectors is a scalar quantity, so work is also a scalar.
Answered by | 21 Dec, 2011, 09:42: AM

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CBSE 9 - Physics
An object of mass 1kg is falling from the height h=10m.calculate a) the total energy of an object at h=10m b) potential energy of the object when it is at h=4m c) kinetic energy of the object when it is at h=4m d) what will be the speed of the object when it hits the ground
Asked by mailtoparvathyprajith | 08 Feb, 2024, 06:45: PM
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CBSE 9 - Physics
1)state energy conversion takes place in hydroelectric power plants? 2)an object of mass 1kg is falling from a height of 10 m. Calculate i) the total energy of object at h=10m ii) Potential energy of an object when h=4m   3)Name energy transfers which occurs when a)an electri bell rings b)someone speake into a microphone c)there is a picture on television screen d)A torch is on  
Asked by mailtoparvathyprajith | 08 Feb, 2024, 12:32: PM
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CBSE 9 - Physics
3)A body does 20 joules of work in 5 seconds what is power
Asked by mailtoparvathyprajith | 06 Feb, 2024, 09:00: PM
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CBSE 9 - Physics
when an arrow is shot from its bow it has kinetic Energy. From where does it get the kinetic Energy
Asked by mailtoparvathyprajith | 06 Feb, 2024, 08:44: PM
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CBSE 9 - Physics
If person A reaches the 2nd floor Of a shopping mall by lift and Person B reaches the same floor by stairs and both their masses are same. Is work done by person B is greater than Person A  against gravitational force.Justify your answer
Asked by mailtoparvathyprajith | 06 Feb, 2024, 08:24: PM
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CBSE 9 - Physics
calculate the amount of work required to stop a car of 1000kg moving with speed of 72km/h
Asked by sadhanaasadhanaa67 | 04 Feb, 2024, 12:27: PM
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CBSE 9 - Physics
Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km hour
Asked by vkjainj56 | 30 Nov, 2023, 12:00: AM
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CBSE 9 - Physics
difference between kinetic energy and potential energy
Asked by mattooamit4u | 28 Nov, 2023, 12:36: PM
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CBSE 9 - Physics
Chapter 10 work and energy
Asked by deadloxyt15 | 10 Oct, 2023, 01:04: PM
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CBSE 9 - Physics
kinematics
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Asked by palagarapapamma1982 | 26 Sep, 2023, 08:50: PM
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