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Syllabus

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

is ncert solutions for computer science avalable

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

^{2}^{2}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:a) its mass is tripled

b) its velocity becomes one-fourth

what is the relation between KW h and joules

what is the proof for w = F S cos theta

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

(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

Q- Give one example of:-

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

^{2}. Find its speed after 2 seconds.(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.

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

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

plzz ans. with explanation ???

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 ball of mass 2kg is thrown up with a speed of 10m/s. find the kinetic energy of the ball at the time of throwing.also find its potential energy of the ball at the highest point.[g = 10m/s].suggest me a working science model for class 9th

Calculate the time for which a motor pump of 10HP and efficiency 80% must be switched on so as to pump 20cubic metre of water through a vertical height of 20metres.

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

The potential energy of a freely falling object decreases progressively. What happens to its (i) kinetic energy (ii) total mechanical energy? State the law on which your answer is based.

A household consumes 1 kWh of energy per day. How much energy is this in joule?

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 derivation of Kinetic energy and Potential energy

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

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 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 theseQ1. 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?

calculate the energy possessed by a stone of mass 10 kg kept on a height of 5m(g = 9.8)

define work , its formula with SI unit ?

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.

define power. Give the SI unit of power

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

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

a) a working electric geyser

b)a glowing electric bulb

c)a working electric fan

d)burning cooking gas

e)a bullet fired from a gun

f)working engine of moving motor car

g)a swinging pendulum

h)a catapult just releasing a stone

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..?

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.

Explain the transformation of energy in hydroelectric power plant?

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

(a) While it is still on the tree.

(b) When it hits the bystander.

(c) When it bounces upto its maximum height.

(d) When it lands on the ground.

(e) When it rolls into a pit and falls 2.5 m deep inside.

why iron nail sinks and cork float on water?

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

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

state three conditions for which work done is zero

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

A body of 5kg raised to 2m find the work done?

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 ?THE LEANING TOWER OF PISA IS 45m HIGH . A MASS OF 4kg IS DROPPED FROM TOP . CALCULATE :

a}THE POTENTIAL ENERGY AT THE TOP

b}THE KINETIC ENERGY JUST BEFORE HITTING THE GROUND

c}THE VELOCITY JUST BEFORE HOTTONG THE GROUND

When do we say that work is done?

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})Q. No work is done when :

(A) a nail is plugged into a wooden board

(B) a box is pushed along a horizontal floor

(C) there is no component of force parallel to the direction of force

(D) there is no component of force normal to the direction of force

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

give examples of the situations of work done and work not done (15-20)

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}science project???

A boy of mass 55 kg runs up a flight of 40 stairs each measuring 0.15m. Calculate the work done by the boy?

srisaji@yahoo.com

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 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

As an object slides down a frictionless incline, the sum of gravitational P.E and the K.E of the object

rna) will decrease

rnb) will increase

rnc) remains the same

rnd) cannot be determined

rnwhy??

rnWater stored in a dam possesses

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

if a porter of height 150cm lifts the load 20kg from railway platform and keeps on his head,the work done by gravity on load is--------------.

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

a) Which energy does it acquire?

b) What is the magnitude of this energy, if mass of stone is m?

c) If this stone is allowed to fall freely, which energy is gained at every point during the fall?

d) How does law of conservation of energy hold well in this energy?

e) At what point of motion kinetic energy is maximum?

f) In what other forms does the energy of the stone convert on striking the ground?

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

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

An engine pumps up 200 kg of water through a height of 12 m in 4 s. The efficiency of the engine is 60%.

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

A mass of 50kg is raised through a certain height by a machine whose efficiency is 90%,the energy spent is 5000J.if the mass is now released,its KE on hitting the ground shall be?