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Syllabus

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

name the transformation of energy involved in the following cases :

1) when a body is throw upwards.

2) when a body falls from the top of a hill

3) when coal burns

4) when a gas burns

5) when water falls from a height

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(a) DID THE OLD MAN DO ANY WORK WHILE HOLDING THE LUGGAGE?

(b) WHAT IS THE EQUATION FOR WORK DONE AGAINST GRAVITY?

(c) WHY DID SAURABH ASK THE OLD MAN TO PUT DOWN THE LUGGAGE?

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

(a) In a tug of war, one team (team A) wins and the other team (team B) loses. Which of these two teams does positive and negative work?

(b) What is the work done in case of a satellite moving around the earth?

Define 1 watt of power:What is the amount of work done in the following cases?Justify your answer by giving appropiate reason

a) by an electron revolving in a circular orbit of radiusr around a nucleus.

b) By the force of gravity when a stone of mass m is dropped from the top of a multi storeyed building of height h

what is the relation between KW h and joules

if a force F is applied on a body and it moves with velocity v , the power will be :

^{2}^{2}What is the formula of sulphide ion,sulphate ion,sulphur ion ?

a ball of mass 2kg is thrown up with a speed of 10m/s. find the kinetic energy of the ball at the time of throwing.also find its potential energy of the ball at the highest point.[g = 10m/s].Q- Give one example of:-

In an oscillating pendulum, at what positions the potential and kinetic energy are maximum?

(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.

calculate the energy possessed by a stone of mass 10 kg kept on a height of 5m(g = 9.8)

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)

a) 3 bulbs of 40 watts for 6 hours

b) 4 tube lightsof 50 watts for 8 hours

*(please mention each step how multiplied and so on )

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})velocity of a body is increased by 5 times what happens to its kinetic energy?

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 ?

calculate the electrical energy consumed in joules if a toaster of 60W is used for 30 minutes

define 1 watt of power?

A man of mass 50kg runs up a flight of stairs having a rise of 5m, is 4s.

1.what is work done?

2.what is average power developed by man?

define work , its formula with SI unit ?

A) the force applied

B)work done in lifting the body

C)what happens to the work performed

define power. Give the SI unit of power

A car weighing 1200 kg is uniformly accelerated from rest and covers a distace of 40m in 5 sec. calculate the work done by car engine

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

Write the various energy transformations that occur in the following cases.

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 ???

A boy of mass 55 kg runs up a flight of 40 stairs each measuring 0.15m. Calculate the work done by the boy?

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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.

a man carries a suitcase in his hand and climbs up the stairs. the work done by the man is :

a) negative

b) positive

c) zero

d) none of the above

explain also please!

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

A 1800 Kg car is moving at 30m/s. when brakes are applied. If the average force

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

Force acting on a particle moving in a straight line varies with the velocity of the particle as F=k/v,where K is a constant.The work done by this force in time t is:

(A)K/v^2.t

(B)2Kt

(C)Kt

(D)2Kt/v^2

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

a bag of rice weighs 75 kg .calculate the height to which it should be raised so that its potential energy is 7500 j.

(given : g = 10 m/s^2)

note - the answer is

10 m.why iron nail sinks and cork float on water?

a) a coconut falling from a tree

b) an object raised to certain height

c) blowing wind.

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 ?if two friends Ram and Shyam each having a weight of 40kg,go for rock climbing. Ram climbs to a hieght of 3m in 10s and Shyam covers the same height in 12s. Then what is the work done by both of the friends?

When do we say that work is done?

a body of mass 2kg is thrown up at a velocity of 10m/s.find the kinetic energy of the body at the time of throw. also find the potential energyof the body at the highest point(g=10)

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})A 2m high person is holding a 25kg trunk on his head and is standing at a roadways bus- terminus. how much work is done by the person ?

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

state & explain the law of conservation of energy with an example 2. explain how total energy a swinging pendulam at any instant of time remains conserved illustrate your answer with the help of Lbelled diagram

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.

A coolie carries a load of 50kg on his head and walks on a level road up to 100m. what is the work done by him.Derive the relation between momentum and kinetic energy ??????

A student is writing Three hour science paper how much work is done by a student ? Give reason for your answer .

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

if you apply one joule of energy to lift a book of 0.5 kg . How high it will raise? (g= 10m/s

^{2})Derive an expression for the kinetic energy of an object of mass 'm' moving horizontally with a uniform velocity 'v'

LIKES TO ALL WHO ATTEMPTS :)

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

when a body falls freely towards the earth, then its total energy:

(a)increases

(b)decreases

(c)remains constant, or

(d)first increases and then decreases

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

a displacement

b force applied

c angle between force

d displacement the initial velocity of the object

define average power

Explain the transformation of energy in hydroelectric power plant?