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Syllabus

derive relationship between commercial unit of energy and si unit of energy

is ncert solutions for computer science avalable

calculate the work required to be done to stop a car of 1500kg moving at a velocity of 60km/h?

Define 1 watt of power:what is the relation between KW h and joules

What is the formula of sulphide ion,sulphate ion,sulphur ion ?

Q- Give one example of:-

(a) Certain force acting on a 20kg mass changes its velocity from 5m /s to 2 m/s . calculate the work done by the force .

(b) State two possible condition under which the work done would be zero.

(c) if the kinetic energy of the body is increased by 300% then determine the percentage increase in the momentum.

the power of motor pump is 2kW. how much water per minute the pump can raise to a height of 10m? (given g = 10m/s)

suggest me a working science model for class 9th

The kinetic energy of an object of mass , m moving with a velocity of 5m/s is 25J.what will be its kinetic energy when its velocity is doubled ?what will be its kinetic energy when its velocity is incrased three times

a body of mass 2 kg is thrown vertically upwards with the initial velocity of 20 m s

^{-1}. what will be its potential energy at the end of 2 seconds.(g=10m s^{-2})What is the derivation of Kinetic energy and Potential energy

What is the work done to increase the velocity of a car from 30km/h to 60km/h if the mass of the car is 1500kg?

the k

_{E }acquired by a mass m in travelling a certain distance s ,starting from rest ,under the action of a constant force is directly proportional to:a)

mb)/

mc)1//

md)none of theseQ1. The volume of 50g of a substance is 20cm3 . If the denstiy of water is 1 g cm3, will the substance float or sink in water ? justify your answer ?

Q2. Show that the energy of a vibrating pendulum is conserved ?

Q3. A ball is dropped from a heigh of 10m. If the energy of the ball reduces by 40% after striking the ground, how much high can the ball bounce back ?

define 1 watt of power?

define work , its formula with SI unit ?

define power. Give the SI unit of power

Derive an expression for the gravitational potential energy of an object of mass 'm' at a height 'h' above the earth's surface.

A stone projected vertically upward with a velocity 'u' reaches a maximum height 'h'. Find the ratio of kinetic energy and potential energy of the stone, when it is at height 3h/4 from the ground..?

1. Can a body have energy without momentum ????

2. Can a body have momentum without energy ?????

plzz ans. with explanation ???

Identify and state the type of transformation of energy in the following cases:

1. When coal is burnt.

2. When a dry cell discharges.

3. In a thermal power plant.

Can any object have momentum even if its mechanical energy is 0? explain.

What is the work done by a satellite moving around the earth ?Justify your answer.

A freely falling object eventually stops on reaching the ground. What happens to its kinetic energy

If the speed of a body is halved ,what will be the change in its kinetic energy??????????

plz answer

why iron nail sinks and cork float on water?

I am confused as to how to find K.E. in the Activity 11.15 at Page 155 of Work and Energy chapter because we don't know the velocity in those cases. Finding P.E. is easy there. Can anybody help???

an electric heater is rated 1500w. how much energy does it use in 10 hrs.express your answer kwt and joules.

wat is the relationship between JOULE (J) and ERG ??????experts answer ??:DDderive an expression for kinetic energy of a body ?

State the relation between commercial unit of energy and joules .!How much work is done on a body of mass 1kg whirling on a path of radius 5m ?If an object is immersed wholly in a liquid causing upthrust equal to the weight of the body then what will be the relation between the relative densities of liquid and the object ?When do we say that work is done?

An object of mass of 20 kg is dropped from a height of 4 m. Fill in the blanks in the following table by computing the potential energy and kinetic energy in each case.

height at which object is located: 4 m, 3 m, 2m, 1m, just above the ground

Potential energy

Kinetic energy

(for simplifying the calculations, take the value of g as 10 m s

^{-2})can you plz give me the examples of kinetic energy?????????????

Water is falling on the Blades of a turbine at the rate of 6 * 10

^{3 kg per minure .}The height of the fall is 10 m . Claculate the power given to the turbine. Take g = 10 m/s

^{2}what is the proof for w = F S cos theta

a truck and a car moving with same kinetic energy are stopped by applying same retarding force by means of brakes. which stops at a smaller distance?

define density?Give its SIunit.

a man drops 10kg rock from the top of a 5m ladder. wht is its speed just before it hits the ground? wht is its kinetic energy wen it reaches da ground.

Derive the relation between momentum and kinetic energy ??????

examples of kinetic enery and potential energy its urgent

Water stored in a dam possesses

(a) no energy (b) electrical energy (c) kinetic energy (d) potential energy

Derive an expression for the kinetic energy of an object of mass 'm' moving horizontally with a uniform velocity 'v'

two bodies of masses (m1) and (m2) have equal kinetic energy. what shall be the ratio of their momentum

prove that the energy remains constant in case of a freely falling body....

An object of mass 40kg is raised to a height of 5m above the ground.What is its PE?If the object is allowed to fall,find its KE when it is half way downAn object of mass 40 kg is raised to a height of 5m above the ground.What is its PE?If the object is allowed to fall,find its KE when it is half way down

define average power

Explain the transformation of energy in hydroelectric power plant?