Work, Energy and Power questions
712 published questions with worked solutions.
- A 10 m long iron chain of linear mass density 0.8 kg m⁻¹ is hanging freely from a rigid support. If g = 10 ms⁻², then the power...
- A coolie 1.5 m tall raises a load of 80 kg in 2 s from the ground to his head and then walks a distance of 40 m in another 2 s....
- Ten litre of water per second is lifted from a well through 20 m and delivered with a velocity of 10 ms⁻¹, then the power of the...
- A particle of mass m is moving in a circular path of constant radius r such that its centripetal acceleration a_c is varying with...
- A dam is situated at a height of 550 m above sea level and supplies water to a power house which is at a height of 50 m above sea...
- One man takes 1 minute to raise a box to a height of 1 m and another man takes ½ minute to do so. The energy spent by the two is
- A body is acted upon by a force, which is inversely proportional to the distance covered (x). The work done will be proportional...
- Power supplied to a particle of mass 2 kg varies with time as P = (3/2)t² watt, where t is in second. If the velocity of the...
- Power applied to a particle varies with time as P = (3t² − 2t + 1) watt, where t is in second. Find the change in its kinetic...
- A 0.5 kg ball is thrown up with an initial speed 14 ms⁻¹ and reaches a maximum height of 8 m. How much energy is dissipated by...
- Power supplied to a particle of mass 2 kg varies with time as P = 3t²/2 watt. Here t is in second. If the velocity of the...
- Statement 1: Two springs of force constants k₁ and k₂ are stretched by the same force. If k₁ > k₂, then work done in stretching...
- A machine which is 75% efficient, uses 12 J of energy in lifting up a 1 kg mass through a certain distance. The mass is then...
- If the kinetic energy of a body is directly proportional to time t, the magnitude of the force acting on the body is
- The height of the dam in a hydroelectric power station is 10 m. In order to generate 1 MW of electric power, the mass of water...
- An ideal spring with spring constant k is hung from the ceiling and a block of mass M is attached to its lower end. The mass is...
- Statement 1: A weight lifter does no work in holding the weight up. Statement 2: Work done is zero because the distance moved is...
- The human heart discharges 75 cc of blood through the arteries at each beat against an average pressure of 10 cm of mercury....
- A ball is dropped from a height of 20 cm. The ball rebounds to a height of 10 cm. What is the loss of energy?
- A bob of mass m accelerates uniformly from rest to v₁ in time t₁. As a function of t, the instantaneous power delivered to the...
Other chapters
Alcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAlternating CurrentAminesAnatomy of Flowering PlantsAncient Indian HistoryAnimal KingdomApplication of DerivativesArea Under CurveAromatic Compounds and Aryl HalidesAtomsBasic Mathematics and LogarithmBinomial TheoremBiodiversity and ConservationBiological ClassificationBiomoleculesBiotechnology and Its ApplicationsBiotechnology: Principles and ProcessesBody Fluids and CirculationBreathing and Exchange of GasesCell Cycle and Cell DivisionCell: The Unit of LifeChemical Bonding and Molecular StructureChemical Coordination and Integration