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Syllabus

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

(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

is ncert solutions for computer science avalable

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.

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

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

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..?

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

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

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 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}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)

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?

suggest me a working science model for class 9th

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

^{o}to the direction of motion .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})please answer fast with proper answer.

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

^{2})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 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

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 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.

define 1 watt of power?

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

define work , its formula with SI unit ?

10. In the atwood machine, P is a massless pulley and springs ${S}_{1}and{S}_{2}$ are also massless. If the blocks are released from rest, the readings in the spring balances ${S}_{1}and{S}_{2}$ are respectively.

$a)\frac{1}{3}kg,\frac{2}{3}kgb)\frac{4}{3}kg,\frac{4}{3}kg\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}c)\frac{2}{3}kg,\frac{4}{3}kgd)\frac{2}{3}kg,\frac{2}{3}kg$

define power. Give the SI unit of power

A bread gives a boy of mass 40kg of energy 21KJ.If the efficiency is 28% the the height can be climbed by using this energy is:

(A)22.5 m

(B)15 m

(C)10 m

(D)5 m

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

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.

1. Can a body have energy without momentum ????

2. Can a body have momentum without energy ?????

plzz ans. with explanation ???

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

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.

- What is the height of the block above the mercury level?
- Water is poured into vessel until it just covers the iron block . What is the height of the water column?

Given that density of iron is 7.2 gm/cc and density of mercury = 13.6 gm/ccA freely falling object eventually stops on reaching the ground. What happens to its kinetic energy

why iron nail sinks and cork float on water?

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.

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 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

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 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})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 ?When do we say that work is done?

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

^{2}^{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}when is the work done by a force on a body positive negative and zero

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 density?Give its SIunit.

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?

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

ok

what is the proof for w = F S cos theta

A quarter horse power motor runs at a speed of 600 r.p.m. Assuming 40% efficiency, then what will be the work done by the motor in one rotation?

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.

The kinetic energy of a body decreases by 36%. What is the percentage decrease in momentum?

examples of kinetic enery and potential energy its urgent

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

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

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

^{3}min^{–1}from a depth of 30 m. If the pump is 70% efficient, what power is developed by the engine?Water stored in a dam possesses

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

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

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.

define average power

a) E1=(m2/M)E

B) E1= m1/m2? E

C) E1= m1/M? E

D) E1= m2/m1? E

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....

Explain the transformation of energy in hydroelectric power plant?