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CBSE - Class 11 > Physics > Work Worksheets

Free CBSE - Class 11 Physics - Work worksheets

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1.
A person trying to lose weight (dieter) lifts a 10 kg mass, one thousand times, to a height of 0.5 m each time. Assume that the potential energy lost each time she lowers the mass is dissipated. (a) How much work does she do against the gravitational force ?
2.
A person trying to lose weight (dieter) lifts a 10 kg mass, one thousand times, to a height of 0.5 m each time. Assume that the potential energy lost each time she lowers the mass is dissipated. (b) Fat supplies $3.8 \times 10^7 \text{J}$ of energy per kilogram which is converted to mechanical energy with a 20% efficiency rate. How much fat will the dieter use up?
3.
A family uses 8 kW of power. (a) Direct solar energy is incident on the horizontal surface at an average rate of 200 W per square meter. If 20% of this energy can be converted to useful electrical energy, how large an area is needed to supply 8 kW?
4.
A family uses 8 kW of power. (b) Compare this area to that of the roof of a typical house.
5.
The bob of a pendulum is released from a horizontal position. If the length of the pendulum is 1.5 m, what is the speed with which the bob arrives at the lowermost point, given that it dissipated 5% of its initial energy against air resistance ?
6.
A trolley of mass 300 kg carrying a sandbag of 25 kg is moving uniformly with a speed of 27 km/h on a frictionless track. After a while, sand starts leaking out of a hole on the floor of the trolley at the rate of $0.05 \text{ kg s}^{-1}$. What is the speed of the trolley after the entire sand bag is empty ?
7.
A body of mass 0.5 kg travels in a straight line with velocity $v = ax^{3/2}$ where $a = 5 \text{ m}^{-1/2} \text{ s}^{-1}$. What is the work done by the net force during its displacement from $x = 0$ to $x = 2$ m ?
8.
The blades of a windmill sweep out a circle of area $A$. (a) If the wind flows at a velocity $v$ perpendicular to the circle, what is the mass of the air passing through it in time $t$ ?
9.
The blades of a windmill sweep out a circle of area $A$. (b) What is the kinetic energy of the air ?
10.
The blades of a windmill sweep out a circle of area $A$. (c) Assume that the windmill converts 25% of the wind’s energy into electrical energy, and that $A = 30 \text{ m}^2$, $v = 36 \text{ km/h}$ and the density of air is $1.2 \text{ kg m}^{-3}$. What is the electrical power produced ?
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Chapters in CBSE - Class 11 Physics

Gravitation Worksheet Kinetic Theory Worksheet Laws of Motion Worksheet Mechanical Properties of Fluids Worksheet Mechanical Properties of Solids Worksheet Motion in a Plane Worksheet Motion in a Straight Line Worksheet Oscillations Worksheet Physical World Worksheet System of Particles and Rotational Motion Worksheet Thermal Properties of Matter Worksheet Thermodynamics Worksheet Units and Measurements Worksheet Waves Worksheet

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