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Syllabus

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

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 theseis 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?

(1) A real image at 8 cm (2) A virtual image at 8 cm

(3) A real image at 4.8 cm (4) A virtual image at 4.8 cm

Q3. In a medium of refractive index 1.6 and having a convex surface has a point object in it at a distance of 12 cm from the pole. The radius of curvature is 6 cm. Locate the image as seen from air.

(1) A real image at 30 cm (2) A virtual image at 30 cm

(3) A real image at 4.28 cm (4) A virtual image at 4.28 cm

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

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 formula of sulphide ion,sulphate ion,sulphur ion ?

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

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.

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..?

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)

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

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})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

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?

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

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 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

define 1 watt of power?

7.In the circuit shown in the figure, the cell has emf = 10 V and internal resistance = 1 $\Omega $(A) the current through the 3 $\Omega $ resistor is 1 amp

(B) the current through the 3 $\Omega $ resistor is 0.5 amp

(C) the current through the 4 $\Omega $ resistor is 0.5 amp

(D) the current through the 4 $\Omega $ resistor is 0.25 amp

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?

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.

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.

please answer fast with proper answer.

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

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

1) Particle will move back and forth across the flat portion 3.5 times while attempting one last right to left journey.

2) Particle will move back and forth across the flat portion 4 times while attempting one last left to right journey.

3) Particle will move back and forth across the flat portion 3.5 times while attempting one last left to right journey.

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

why does air move from place to place?

why iron nail sinks and cork float on water?

wat is the relationship between JOULE (J) and ERG ??????experts answer ??:DDA BIRD FLYING IN THE SKY POSSES POTENTIAL OR KINETIC ENERGY.

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

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

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 ?

A block of mass 30 kg is pulled up by a rope with constant speed by applying a force of 200N parallal to the slope. A B are the initial and final position of the block-:

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???

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 ?How do green plants produce food ?

When do we say that work is done?

2. A car is accelerated on a levelled road and attains a velocity 4 times of its

can you plz give me the examples of kinetic energy?????????????

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}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 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 pump is required to lift 1000 kg of water per minute from a well and eject it with a speed of 10 m/s. The horse power of the engine needed is..?

what is the proof for w = F S cos theta

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.

examples of kinetic enery and potential energy its urgent

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

why do some engines require fuel like petrol and deisel ?

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

an object is immersed is different liquids. Is same buoyant force acts on the object due to all liquids?

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

A bullet is fired normally on an immovable plank of wood. It loses 25% of its kinetic energy in penetrating a thicknees x of the plank. What is the total thickness penetrated by the bullet?

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?

1 kg ball is thrown up with speed of 9.9m/s.Calculate the work done by its weight in 1 second

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

^{2})Explain the transformation of energy in hydroelectric power plant?