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Syllabus

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

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?

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

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

A car weighing 1200 kg is uniformly accelerated from rest and covers a distace of 40m in 5 sec. calculate the work done by car engine

Q- Give one example of:-

i) hydroelectric power

ii) explosion of cracker

iii) oscillating pendulum

(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.

^{-2})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)

A body of mass m is raised to a vertical height h through two different paths. What will be the potential energy of the body in the two cases? Give reasons

suggest me a working science model for class 9th

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

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 amount of work done in the following cases?Justify your answer by giving appropiate reason

a) by an electron revolving in a circular orbit of radiusr around a nucleus.

b) By the force of gravity when a stone of mass m is dropped from the top of a multi storeyed building of height h

What is the derivation of Kinetic energy and Potential energy

Two bodies of different masses m1 and m2 (m1>m2) have same kinetic energy . They are stopped by applying some retarding force . Which body will stop first ?

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?

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 ?

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

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 these1. Can a body have energy without momentum ????

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

plzz ans. with explanation ???

define 1 watt of power?

define work , its formula with SI unit ?

define power. Give the SI unit of power

A child winds his toy car by moving its key. Name the type of energy -

(a) used up in the process

(b) energy transformation taking place in it

The car then runs on the floor of the room. Give the transformation of energy taking place it now.

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

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

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..?

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

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.

what is the proof for w = F S cos theta

state the nature of work done in the following cases giving justification for each:

a) when a truck moves on the road , work done by friction.

b) work done in pushing a heavy fixed rock

c) work done by a force in lifting a heavy book from a table

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.

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

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?

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

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

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???

What happens to the kinetic energy when

i ) The mass of the body is doubled at constant velocity

ii ) The velocity of the body is doubled at constant velocity

iii ) The mass of the body is doubled but the velocity is reduced to

half.

wat is the relationship between JOULE (J) and ERG ??????experts answer ??:DDderive an expression for kinetic energy of a body ?

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?

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 ?Which of the following compounds when dissolved in water gives coloured solution ? (a) barium chloride (b) sugar solution (c) sodium chloride (d) copper sulphate

When do we say that work is done?

A student noted down the following observations in his note book:

(i) Weight of the stone in air = 272 g wt

(ii) Weight of the stone in water = 192 g wt

(iii) Weight of the stone in salty water = 176 g wt

The relative density of the salty water must be

A.

11/12

B.

11/17

C.

13/17

D.

6/5

i know the answer is D but

can anyone show the method to do it?

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

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) the force applied

B)work done in lifting the body

C)what happens to the work performed

define density?Give its SIunit.

define power. derive its si unit. an electric bulb is rated 10w. what does it mean? what is the energy consumed in joules if it is used for 5min?

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 ??????

examples of kinetic enery and potential energy its urgent

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.

Water stored in a dam possesses

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

Q. Rajiv is a student of class IX. He bought a toy gun from the market. The bullets used in gun were made of rubber. His mother asked Rajiv not to fire bullets on the window panes. Rajiv went in a park and fired bullets on a displaying screen made of plastic. Rajiv's friend Rohan objected the action of Rajiv. Rajiv started quarrelling with Rohan.

amswer the following

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

Three rods A,B,C of same length and same cross-sectional area are joined. Their thermal conductivity are in ratio 1:2:(1.5).If the ends of A and C are at 200degreescentgrade and 18degreescentgrade respectively, compute the temperature at the of A and B in equilibrium.

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

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

define average power

Explain the transformation of energy in hydroelectric power plant?