Work, Energy and Power questions
712 published questions with worked solutions.
- A pump motor is used to deliver water at a certain rate from a given pipe. To obtain twice as much water from the same pipe in...
- A body of mass M is moving with a uniform speed of 10 m/s on a frictionless surface under the influence of two forces F₁ and F₂....
- A body of mass m accelerates uniformly from rest to v₁ in time t₁. As a function of time t, the instantaneous power delivered to...
- From an automatic gun, a man fires 360 bullets per minute with a speed of 360 km/hour. If each bullet weighs 20 g, the power of...
- Power of a water pump is 2 kW. If g = 10 m/sec², the amount of water it can raise in one minute to a height of 10 m is [CBSE PMT...
- The power of a pump, which can pump 200 kg of water to a height of 200 m in 10 sec, is (g = 10 m/s²)
- A quarter horse power motor runs at a speed of 600 r.p.m. Assuming 40% efficiency, the work done by the motor in one rotation...
- A force applied by an engine of a train of mass 2.05 × 10⁶ kg changes its velocity from 5 m/s to 25 m/s in 5 minutes. The power...
- From a waterfall, water is falling down at the rate of 100 kg/s on the blades of a turbine. If the height of the fall is 100 m,...
- Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional forces are 10% of...
- A truck of mass 30,000 kg moves up an inclined plane of slope 1 in 100 at a speed of 30 kmph. The power of the truck is (Given g...
- A car of mass 1250 kg is moving at 30 m/s. Its engine delivers 30 kW while the resistive force due to the surface is 750 N. What...
- A force of 2î + 3ĵ + 4k̂ N acts on a body for 4 seconds, and produces a displacement of (3î + 4ĵ + 5k̂) m. The power used is
- An engine develops 10 kW of power. How much time will it take to lift a mass of 200 kg to a height of 40 m? (g = 10 m/sec²)
- A car of mass 1000 kg accelerates uniformly from rest to a velocity of 54 km/hour in 5 sec. The average power of the engine...
- An electric pump is used to fill an overhead tank of capacity 9 m³ kept at a height of 10 m above the ground. If the pump takes 5...
- An engine pump is used to pump a liquid of density ρ continuously through a pipe of cross-sectional area A. If the speed of flow...
- A ball dropped from a height of 2 m rebounds to a height of 1.5 m after hitting the ground. Then the percentage of energy lost is
- A ball is allowed to fall from a height of 10 m. If there is a 40% loss of energy due to impact, then after one impact the ball...
- The potential energy of a 1 kg particle free to move along the x-axis is given by V(x) = (x⁴/4 − x²/2) J. The total mechanical...
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