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Syllabus

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

The kinetic energy of a car is 7000 J as it travels along a horizontal road. How much work is required to stop the car in 20 s?

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?

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

^{2}^{2}Define 1 watt of power:what is the relation between KW h and joules

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

Q.4. A meter scale of mass 1 kg and thickness 2 cm is lying flat on the ground. When it is placed vertically the increase in potential energy is

Option:Q- Give one example of:-

a) 3 bulbs of 40 watts for 6 hours

b) 4 tube lightsof 50 watts for 8 hours

*(please mention each step how multiplied and so on )

(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.

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)

when a book is lifted from a table , against which force work is done ?

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

this bus.

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

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

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?

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.

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 ?

if a force of 'F' newton moves a body with constant speed 'v', the power delivered by it is________

define 1 watt of power?

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.

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..?

a metre scale of mass 100g is pivoted at one end . if it is held at 30 degree with the horizontal what is the potential energy associated with it?

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.

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

a force of 5N is acting on an object. the object is displaced through 2m in the direction. if the force acts on the object all through the displacement, then work is 5N multiply by 2m =10N m or 10j

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

Define 1J of Work?

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 particle starts from rest at x=0 and moves to x=L, under the action of a variable force F(x) which is shown in figure. What is the kinetic energy of particles at x = L/2 & at x = L.

why iron nail sinks and cork float on water?

a) zero

b) positive

c) negative

d) none of these

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 horizontal force act on a body placed on a smooth horizontal table of the force applied is 10 newton. Find the total work done when the displacement of the body is 5 m.

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

A BIRD FLYING IN THE SKY POSSES POTENTIAL OR KINETIC ENERGY.

wat is the relationship between JOULE (J) and ERG ??????experts answer ??:DD(a) In a tug of war, one team (team A) wins and the other team (team B) loses. Which of these two teams does positive and negative work?

(b) What is the work done in case of a satellite moving around the earth?

derive an expression for kinetic energy of a body ?

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

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 ?Define work. How is work measured? When is work done by a force said to be negative?

When do we say that work is done?

A rock weighing 20N falls from a height of 16m and sinks 0.6m into the ground.From energy considerations,find the average force f between the rock and the ground as the rock sinks.

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}what is the proof for w = F S cos theta

A woman stands on the edge of a cliff and throws a stone vertically downward with an initial speed of 15 m/s. The instant before the stone hits the ground below, it has 2000 J of kinetic energy. If she were to throw the stone horizontally outward from the cliff with the same initial speed of 15 m/s, how much kinetic energy would it have just before it hits the ground?

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 ??????

brakes and the work done by the car on the brakes.

examples of kinetic enery and potential energy its urgent

Water stored in a dam possesses

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

Two bodies of equal masses move with uniform velocities v and 3v respectively.Find the ratio of their kinetic energies.

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

a 2-kg body is sliding up an inclined plane of inclination 30degree .find the work done by the force of gravity in moving the body through 1m.

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

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

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

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

Explain the transformation of energy in hydroelectric power plant?

name the transformation of energy involved in the following cases :

1) when a body is throw upwards.

2) when a body falls from the top of a hill

3) when coal burns

4) when a gas burns

5) when water falls from a height