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Syllabus

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

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].is ncert solutions for computer science avalable

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

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

^{2}^{2}what is the relation between KW h and joules

a) When a truck moves on a road the work done by friction

b. workdone in pushing a heavy fixed rock?

c.workdone by a force in lifting a heavy book from a table?

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

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

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)

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 ?

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 bag of wheat weighs 50 kg, find the height to which it should be raised so that potential energy is 5000 J(g = 10m/s

^{2)}?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})If an electrical appliance is rated 1000 W and is used for 2 hours . Calculate the work done in 2 hours .

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?

19. What work a boy of mass 50kg will do in order to increase running speed from

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 thesea person holds a body of mass 20 kg over his head for 10 sec. has he done any work? justify

Q1. 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 ?

1. State the energy changes taking place in the following cases: (1) A car moves up a

define 1 watt of power?

in a house 8 tube lights of 40w each are used for 6 hrs , 2 bulbs of 100w each are used for 4hrs daily . calculate the energy consumpyion of that house in the month of november ?

define work , its formula with SI unit ?

brakes and the work done by the car on the brakes.

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..?

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

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

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?

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

plz answer

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.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???

Take the readings of the electric meter each day at 6.30 am and 6.30 pm. How many ‘units’ are consumed during day time?How many ‘units’ are used during night? • Do this activity for about a week. • Tabulate your observations. • Draw inferences from the data. • Compare your observations with the details given in the monthly electricity

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 ?

A block is thrown upward with a kinetic energy of 1J. If it goes to maximum height of 1 metre. Find the mass of the block.

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 ?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

When do we say that work is done?

a) its mass is tripled

b) its velocity becomes one-fourth

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}A RICKSHAW PULLER PULLS THE RICKSHAW BY APPLYING A FORCE OF 100 N. IF THE RICKSHAW MOVES WITH A CONSTANT VELOCITY OF 36 km/h , FIND THE POWER OF THE RICKSHAW PULLER

what is the proof for w = F S cos theta

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

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 ??????

7. If a man lifts a load up with the help of a rope such that it raises the load of mass 50kg

to a height of 20m in 100 sec. Find the power of man

8. A ball is dropped from a height of 5m. Find the velocity of the ball just before it

reaches the ground. Do you require the value of mass to find the velocity?

9. Two persons A and B do same amount of work. The person A does that work in t1sec

and the person b in t2sec. Find the ratio of power delivered by them.

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

Give an Example of force acting perpendicular to the direction of displacement ..

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

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

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

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

1. Derive the formula for work done by a constant force?

define average power

what happens when you touch the paper clip of self made electroscope? what is this process called

Explain the transformation of energy in hydroelectric power plant?

(i) How will its PE change?

(ii) What are the various energy conversions taking place?

(iii) What will be its ultimate energy?