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4.Work and Energy
04 Work and Energy, Simple machine
A simple machine helps a person in doing :
question-a-simple-machine-helps-a-person-in-doing-ias-pre-1996
Question: Energy conservation means- ( MP PCS (pre) 2000 )
question-energy-conservation-means-mp-pcs-pre-2000
Question: Most of the sources of energy we use, represent stored solar energy. Which of the following is NOT ultimately derived from the Sun's energy ? ( UP PCS (Pre) 2022 )
question-most-of-the-sources-of-energy-we-use-represent-stored-solar-energy-which-of-the-following-is-not-ultimately-derived-from-the-sun-s-energy-up-pcs-pre-2022
Question: The energy of wind is - ( Utt Lower Sub. (pre) 2010 )
question-the-energy-of-wind-is-utt-lower-sub-pre-2010
Question: In wind power, which form of energy is converted into electrical energy ? ( UP PCS (pre) 2016 )
question-in-wind-power-which-form-of-energy-is-converted-into-electrical-energy-up-pcs-pre-2016
Question:
question
In Science, no work is done without
in-science-no-work-is-done-without
The ultimate source of all energy is Sun. Work done is a scalar quantity. What is the SI unit of work?
the-ultimate-source-of-all-energy-is-sun-work-done-is-a-scalar-quantity-what-is-the-si-unit-of-work
As per the definition of Physics, work done is in the following case:
as-per-the-definition-of-physics-work-done-is-in-the-following-case
According to the Law of conservation of energy, energy can neither be created nor destroyed but it always changes form one form to another. eg. In a dam water has potential energy, when it passes through turbine it produces electricity means changing potential energy to kinetic energy to electrical energy. The energy in stored position is called:
according-to-the-law-of-conservation-of-energy-energy-can-neither-be-created-nor-destroyed-but-it-always-changes-form-one-form-to-another-eg-in-a-dam-water-has-potential-energy-when-it-passes-through-turbine-it-produces-electricity-means-changing-potential-energy-to-kinetic-energy-to-electrical-energy-the-energy-in-stored-position-is-called
There are two object of mass 10 kg and 20 kg having equal momentum. Which will have more kinetic energy?
there-are-two-object-of-mass-10kg-and-20-kg-having-equal-momentum-which-will-have-more-kinetic-energy
Two bodies A and B of masses 10 kg and 20 kg respectively are at the same height above the ground.Which of the two has the greater potential energy?
two-bodies-a-and-b-of-masses-10-kg-and-20-kg-respectively-are-at-the-same-height-above-the-ground-which-of-the-two-has-the-greater-potential-energy
A truck driver starts off with his loaded truck. What are the major energy changes that take place in setting the truck into motion?
a-truck-driver-starts-off-with-his-loaded-truck-what-are-the-major-energy-changes-that-take-place-in-setting-the-truck-into-motion
A body of mass 1 kg falls from a height of 5 meter. How much energy does it possess at any instant? Take g = 9.8 ms-2
a-body-of-mass-1-kg-falls-from-a-height-of-5-meter-how-much-energy-does-it-possess-at-any-instant-take-g-9-8-ms-2
Here are few examples of conversion of energy , which one is not correctly matched
here-are-few-examples-of-conversion-of-energy-which-one-is-not-correctly-matched
Match the following: The correct match is
match-the-following-item-kind-of-energy-a-petrol-i-potential-b-bent-bow-ii-light-energy-c-moving-missile-iii-chemical-d-solar-lamp-iv-kinetic-the-correct-match-is
"A" person of mass 80 kg and "B" person of mass 50kg, both are running with the same speed. Which has more kinetic energy?
a-person-of-mass-80-kg-and-b-person-of-mass-50kg-both-are-running-with-the-same-speed-which-has-more-kinetic-energy
An apple is falling from a tree of height h. Which of the following graph truly represent its potential energy-height relation?
an-apple-is-fallig-from-a-tree-of-height-h-which-of-the-following-graph-truely-represent-its-potential-energy-height-relation
An Object of 5 kg weight, is raised by A to the height of 1 meter in 5 seconds, while B raises to same height in 10 seconds. What is ratio of energy between A and B.
an-object-of-5kg-weight-is-raised-by-a-to-the-height-of-1-meter-in-5-seconds-while-b-raises-to-same-height-in-10-seconds-what-is-ratio-of-energy-between-a-and-b
A body of mass 5 k g is taken from a height of 5 m to 10 m. Find the increase in its potential energy. Take g =10 m s − 2.
a-body-of-mass-5-k-g-is-taken-from-a-height-of-5-m-to-10-m-find-the-increase-in-its-potential-energy-take-g-10-m-s-2
A lady pulls a bucket filled with water having mass 10 kg. from 8 meter deep well in 20 seconds. Calculate work done and power.
a-lady-pulls-a-bucket-filled-with-water-having-mass-10-kg-from-8-meter-deep-well-in-20-seconds-calculate-work-done-and-power
The level of water in a well is 50 meter. A lady pulls a bucket full of water of mass 20 kg. calculate the work done by lady?
the-level-of-water-in-a-well-is-50-meter-a-lady-pulls-a-bucket-full-of-water-of-mass-20-kg-calculate-the-work-done-by-lady
Two balls one of cricket ball and another of tennis. ball, both of same size and shape hits a persons with the equal velocity. persons will be hurted more by
two-balls-one-of-cricket-ball-and-another-of-tennis-ball-both-of-same-size-and-shape-hits-a-persons-with-the-equal-velocity-persons-will-be-hurted-more-by
A car is running at a speed of 10 km/hr while another similar car is running at a speed of 20 km/hr. The kinetic energies of both car are in ratio of
a-car-is-running-at-a-speed-of-10-km-hr-while-another-similar-car-is-running-at-a-speed-of-20-km-hr-the-kinetic-energies-of-both-car-are-in-ratio-of
Look at the following figure, in which body is displaced west to east in 3 way namely (i) force applied in direction of zero degree (ii) force applied in the direction of 90 degree and (iii)force applied in the direction of 180 degree . Work done is positive in which direction of force and movement ?
look-at-the-following-figure-in-which-body-is-displaced-in-3-way-namely-i-in-direction-oo-ii-in-the-direction-90o-and-iii-in-the-direction-180o-work-done-is-positive-when-the-direction-of-force-and-movement-is
When a body moves in a circular path, how much work is done by the body?
when-a-body-moves-in-a-circular-path-how-much-work-is-done-by-the-body
Following is/are the some formula(s) related to the work and energy. Which of the following is correct?
following-is-the-some-formula-related-to-the-work-and-energy-which-of-the-following-is-correct
1 horse power is equal to ______ watt :
1-horse-power-is-equal-to-watt
A body of mass 5kg is moving with a velocity of 10 ms-1 . What will be the ratio of its initial kinetic energy and final kinetic energy, if the mass of the body is doubled and velocity is halved?
a-body-of-mass-5kg-is-moving-with-a-velocity-of-10-ms-1-what-will-be-the-ratio-of-its-initial-kinetic-energy-and-final-kinetic-energy-if-the-mass-of-the-body-is-doubled-and-velocity-is-halved
Match the following: The correct match is
match-the-following-the-correct-match-is
A cook uses a “fire tong” of length 28 cm to lift a piece of burning coal of mass 250 g. If he applies his efforts at a distance of 7 cm from the fulcrum, effort is equal to
a-cook-uses-a-fire-tong-of-length-28-cm-to-lift-a-piece-of-burning-coal-of-mass-250g-if-he-applies-his-efferts-at-a-distance-of-7-cm-from-the-fulcrum-effert-is-equal-to
A rod of length 1.50 m has its fulcrum situated at a distance of 0.5m from the load. Calculate the mechanical advantage (MA) of the rod?
a-rod-of-length-1-50-m-has-its-fulcrum-situated-at-a-distance-of-0-5m-from-the-load-calculate-the-mechanical-advantage-ma-of-the-rod
It is easy to cut an apple with sharp knife than the butter knife, why:
it-is-easy-to-cut-an-apple-with-sharp-knife-than-the-butter-knife-why
It is very easy to draw a bucket full of water from a well when pulley is used than a case when bucket is pulled directly without using pulley why:
it-is-very-easy-to-draw-a-bucket-full-of-water-from-a-well-when-pulley-is-used-than-a-case-when-bucket-is-pulled-directly-without-using-pulley-why
Iron nails have plane surface while screw have helical threads over their surface. When same amount is force is applied on wooden board, by both iron nails and screw, What will be the outcome:
iron-nails-have-plane-surface-while-screw-have-helical-threads-over-their-surface-when-same-amount-is-force-is-applied-on-wooden-board-by-both-iron-nails-and-screw-what-will-be-the-outcome
The tyre of car has got punctured and it is to be changed. You find that screw jack has helical threads on its surface. these helical threads help in the following manner:
the-tyre-of-car-has-got-punchured-and-it-is-to-be-changed-you-find-that-screw-jack-has-helical-threads-on-its-surface-these-helical-threads-help-in-the-following-manner
