Select Board & Class
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 :
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- 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.
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
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
the kE 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:
d)none of these
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 ?
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??????????
why iron nail sinks and cork float on water?
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
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
(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 * 103 kg per minure .
The height of the fall is 10 m . Claculate the power given to the turbine. Take g = 10 m/s2
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
prove that the energy remains constant in case of a freely falling body....
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
Copyright © 2020 Applect Learning Systems Pvt. Ltd. All rights reserved.
E.g: 9876543210, 01112345678
We will give you a call shortly, Thank You
Office hours: 9:00 am to 9:00 pm IST (7 days a week)