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Syllabus

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

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..?

is ncert solutions for computer science avalable

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

Define 1 watt of power:An engine pulls a car of mass 1500kg on a level road at constant speed of 5m/s.If the frictional force is 500N,what power does the engine generate?

what is the relation between KW h and joules

In the track shown in figure section AB is a quadrant of a circle of 1.0 m radius. A block is released at A and slides without friction until it reaches point B. How fast is it moving at B, the bottom of the quadrant?

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

Q- Give one example of:-

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) 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.

A body starts from rest and acquires a velocity V in time T. The work done on the body in time t is proportional toA) Vt/tB) Vsquare tsquare/ TC)Vsquare tsquare/ T

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)

Calculate the work done in raising a stone of mass 5 kg and specific gravity 3 lying at the bed of a lake through a height of 5 metre.

suggest me a working science model for class 9th

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})^{2})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

an elevator weighing 500 kg is to be lifted up at a constant velocity of 0.4m/s . what should be the minimum horse power of the motor to be used?

What is the derivation of Kinetic energy and Potential energy

the kinetic energy acquired by a body of mass m after travelling a fixed distance from rest under the action of a constant force is

a) directly proportional to mass m

b)inversely proportional to mass m

c) inversely proportional to mass m to the power 12

d) independent of mass m

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?

A 1000 kg elevator rises from rest in the basement to the fourth floor,a distance of 20m.As it passes the fourth floor its speed is 4m/s. There is a constant frictional force of 500N. The work done by the lifting mechanism is:

(A)196*10^3 J

(B)204*10^3 J

(C)214*10^3 J

(D)203*10^5 J

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 ?

A block of mass 2 kg is lying on the frictionless table. A force of 8N is applied on it for 12 seconds. Calculate its Kinetic Energy.

define 1 watt of power?

define work , its formula with SI unit ?

if the heart of a man pumps 4 litres of blood per minute at a pressure of 130 mm of mercury

if the density of mercury is 13.6 gcm-3 calculate the power of heart

define power. Give the SI unit of power

A block of mass 1 kg slides down on an inclined plane of inclination 30 degrees.Calculate the work done by the bklocks weight as it slides through 50 cm.

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

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.

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

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

ans-3h/4

explain how to solve

why iron nail sinks and cork float on water?

Two bodies A and B of masses 4kg and 16kg respectively have the same kinetic energy . Calculate the ratio of their velocities?

ok

A body of mass is dropped from a height h on a sand floor. If the body penetrates X cm in to the sand , the average resistance offered by the sand to the body is:

wat is the relationship between JOULE (J) and ERG ??????experts answer ??:DDan electric heater is rated 1500w. how much energy does it use in 10 hrs.express your answer kwt and joules.

A person draws water from a5m deep well in a bucket of mass 2 kg of capacity 8 litre by a rope of mass 1kg. what is the total work done by the person?(assume g= 10 m/s

^{2}^{)}^{a)550J b)525 J c)125J d)500J}If the speed of a body is halved ,what will be the change in its kinetic energy??????????

plz answer

derive 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 ?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???

25 J of work It is given that the applied force is inclined 60

^{o}to the direction of motion .When do we say that work is done?

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}An object of mass 10 kg falls from rest through a vertical distance of 10m and acquires a velocity of 10m/s . The work done by the push of air on the object is (g=10 m/s

^{2})a) 500J b)-500J c)250J d)-250J

define density?Give its SIunit.

Experts please answer!

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 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?

A diwali rocket is ejecting 0.05 kg of gases per second at a velocity of 400 m s -1 . The accelerating force on the rocket is

( a ) 20 dyne ( b ) 20 newton

( c ) 20 kg wt ( d ) sufficient data not given

what is the proof for w = F S cos theta

a. zero

b. would increase

c. would decrease

d. remains fixed

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.

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

examples of kinetic enery and potential energy its urgent

two bodies of mass 1kg and 4kg have equal kinetic energy.wat is the ratio of their momentum?

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

what is the work done by a man in carrying a suitcase weighing 20 kg over his head when he travels a distance of 10 m

1-- in vertical direction

2-- in horizontal direction

take g=9.8 m/s

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

please answer fast with proper answer.

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

Water stored in a dam possesses

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

plz plz experts ans this q fast

define average power

Illustrate the law of conservation of energy by discussing the energy changes which occur when we draw a pendulum bob to one side and allow it to oscillate. Why does the bob eventually come to rest? What happens to its energy eventually? Is it a violation of the law of conservation of energy?

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

Define 1J of Work?

Explain the transformation of energy in hydroelectric power plant?

find the ratio of linear momentum of two particles of masses 1 and 4 kg if their K.E are equal ?

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