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Syllabus

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

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

^{2}^{2}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?

A mass of 50kg is raised through a certain height by a machine whose efficiency is 90%,the energy spent is 5000J.if the mass is now released,its KE on hitting the ground shall be?

Define 1 watt of power:Two bodies of mass 1 Kg and 9 Kg are moving with same velocity . What is the ratio of their kinetic energy?

what is the relation between KW h and joules

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

An object, initially at rest, is given a constant force such that it acquires a uniform acceleration of 0.20 m/s2. The mass of the object is 15 kg.

If the frictional force is neglected, then what is the work done by the force after five seconds?

Q- Give one example of:-

a) its mass is tripled

b) its velocity becomes one-fourth

(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.

Two bodies of mass 1Kg and 3 Kg have equal kinetic energies. find the ratio of their velocities.?

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)

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

suggest me a working science model for class 9th

Which of the following is carried by the waves from one place to another:

a) mass b) velocity c) wavelenght d) energy

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

renatta gass is out with her friends.misfortune occurs and renetta and her friends find themselves getting a workout.they apply a cumulative force of 1080 N to push the car 218 m to the nearest fuel station.determine the workdoneon the car.

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

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!

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?

c) What happens to the potential energy of a body, if its (1) height is doubled, (2) mass is increased by three times, (3) the body is taken of the surface of the Moon?

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 ?

A particle starts from rest at x=0 and moves to x=L, under the action of a variable force F(x) which is shown in figure. What is the kinetic energy of particles at x = L/2 & at x = L.

define 1 watt of power?

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

srisaji@yahoo.com

define work , its formula with SI unit ?

define power. Give the SI unit of power

An object is dropped to the earth from a height of 10 m. Which of the following graphs of kinetic energy vs time best represent the kinetic energy of the object as it approached the earth (neglect air friction).

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

which physical quantity has the S.I. unit = Nm or newton -metre

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.

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

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

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

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?

(A) Kinetic energy

(B) Potential energy

(C) Momentum

(D) Acceleration

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 ?

what happens to the kinetic energy of a body when its velocity becomes one third?

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 ?a 1000 w oven is used everyday for 90 min . calculate the unit of electrical energy oven consumed in 30 days

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?????????????

i want the answer fast.....plzzzzzzzzz

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?

Q2)

Which of the following statements about the work done by a force is incorrect?

Work is done by a force only if a body moves towards the direction of the applied force.

Work done by a body is equal to the amount of energy gained or spent by the body.

Work done by a force can be zero even if the body moves to a certain distance.

Work done by a force can be positive as well as negative.

Ans :Work done by a force is defined as the product of the force on a body and the displacement of the body along the line of action of the force. Therefore,

This is because the displacement of the body is along the line of action of the applied force. In this case, the work done by the force is considered negative.it is not necessary that the body always moves towards the direction of the applied force. Even if a body moves opposite to the direction of the applied force, work is done by the applied force.The correct answer is A.

Dear Experts, I can't understand this. How can it be not necessary that an objectalways moves towards the direction of the applied force?

If the above is correct, then please coin an example.

define density?Give its SIunit.

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

^{2})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 ??????

Lift an object up. Work is done by the force exerted by you on the object. The object moves upward. The force you exerted is in the direction of displacement. However, there is the force of gravity acting on the object. Which one of these forces is doing positive work? Which one is doing negative work? Give reasons.

examples of kinetic enery and potential energy its urgent

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

Water stored in a dam possesses

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

how would you separate dyes in black-black ink using chromatography

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

give examples of the situations of work done and work not done (15-20)

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

A 5 kg cart is pushed by a 30 N force against friction for a distance of 10 m in 5 sec. Determine the power needed to move the cart.

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

what is work?

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?

(1) 20 J

(2) 40 J

(3) 160 J

(4) 80 J