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Syllabus

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

A body moving in a straight line at 72kmph undergoes an acceleration of 4m/s

^{2}. Find its speed after 2 seconds.is ncert solutions for computer science avalable

(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

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

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

Define 1 watt of power:give examples of the situations of work done and work not done (15-20)

what is the relation between KW h and joules

Q- Give one example of:-

Plz Meritnation answer fast!!!!!!

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

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???

(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.

give 2 features of a desktop computer that would make it more suitable than palmtop computer for a multimedia presentation

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)

suggest me a working science model for class 9th

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 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})Prove that kinetic energy =p

^{2}/2mThe 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?

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

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 ?

define 1 watt of power?

why do some engines require fuel like petrol and deisel ?

define work , its formula with SI unit ?

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..?

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)if raghu paddles the bicycle with a speed of 8 km/hr and if he wants to reach 10 minutes before the school commences what should be the duration before which he must leave his house

b) justify the stand taken by raghu in your own words.

c) write the energy transformation taking place while raghu rides his bicycle.

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.

name a cell organelle found only in a plant cell and also its type

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

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

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

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

plzz ans. with explanation ???

why is wheel and axle called continuous lever?

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

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 kinetic energy of a body ?

1. A child is pulling a toy car along a horizontal surface :

(a) Name the forces acting on the toy car.

(b) Which of these forces performs positive work?

(c) Which of these forces performs negative work ?

Justify your answer.

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

^{2}^{2}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})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}define density?Give its SIunit.

.E = mc^{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 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 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.

a car weighing 500kg working against resistance of 500N accelerates from rest to 20 m/s in 100min. what is the work done by the engine of the car

examples of kinetic enery and potential energy its urgent

Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?

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

Calculate the kinetic energy of a body of mass 200 kg moving with velocity of 36km/h.

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

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

find the ratio of C.G.S to SI unit of energy ?

Water stored in a dam possesses

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

calculate the electricity bill amount for a month of 30 days if 4 bulbs of 50 W for 6 hrs ,3 tubelights of 40 W for 3 hrs, a TV of 100 W for 6 hrs,a refrigerator of 300 W for 24 hrs are used.The cost per unit is Rs.2.50

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?

science project???

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

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.

A boy of mass 50kg runs up a staircase of 45 steps in 9sec if the height of each stair is 15cm find his power. Take g=10m/sec..??

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