CBSE Class 9: Energy Videos | Work done in Raising an Object

• 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  
• 3)A body does 20 joules of work in 5 seconds what is power
• difference between kinetic energy and potential energy
• define kinetic energy
• An elevator is designed to lift a load of 1000 kg with uniform velocity of 2m/s . Power of the elevator will be?
• if we increase kinetic energy by 20%, then find percentage increase in linear momentum
• a bus of mass 10000kg with a velocity of 90 km/h. calculate work done to stop the bus
• define kinetic energy
• what is kinetic energy
• Hi, my name is Aprameya i had a doubt we know K.E.(Kinetic Energy) = (1/2)mv^2 the v over here is velocity but at what time. Velocity will be different at differnt points of time i mean at 1second it might be something and and at another second it might be something else. so while calculating which velocity do we use

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