Categorized as: class-11-physics-unit-6

A body of mass 0.5 kg travels in a straight line with velocity v = ax3/2 where a = 5 m1/2 s-1. What is the work done by the net force during its displacement from x = 0 to x = 2 m? | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-6 Work, Energy And Power

Q.20:-  A body of mass 0.5 kg travels in a straight line with velocity v = ax3/2 where a = 5 m1/2 s-1. What is the work done by the net…

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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 kg s–1. What is the speed of the trolley after the entire sand bag is empty? | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-6 Work, Energy And Power

Q.19:- 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…

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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? | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-6 Work, Energy And Power

Q.18:- 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…

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The bob A of a pendulum released from 30° to the vertical hits another bob B of the same mass at rest on a table as shown in Fig. 6.15. How high does the bob A rise after the collision? Neglect the size of the bobs and assume the collision to be elastic. | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-6 Work, Energy And Power

Q.17:- The bob A of a pendulum released from 30° to the vertical hits another bob B of the same mass at rest on a table as shown in Fig. 6.15….

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Two identical ball bearings in contact with each other and resting on a frictionless table are hit head-on by another ball bearing of the same mass moving initially with a speed V. If the collision is elastic, which of the following figure is a possible result after collision? | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-6 Work, Energy And Power

Q.16:- Two identical ball bearings in contact with each other and resting on a frictionless table are hit head-on by another ball bearing of the same mass moving initially with a…

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A pump on the ground floor of a building can pump up water to fill a tank of volume 30 m3 in 15 min. If the tank is 40 m above the ground, and the efficiency of the pump is 30%, how much electric power is consumed by the pump? | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-6 Work, Energy And Power

Q.15:- A pump on the ground floor of a building can pump up water to fill a tank of volume 30 m3 in 15 min. If the tank is 40 m…

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A molecule in a gas container hits a horizontal wall with speed 200 m s–1 and angle 30° with the normal, and rebounds with the same speed. Is momentum conserved in the collision? Is the collision elastic or inelastic? | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-6 Work, Energy And Power

Q.14:- A molecule in a gas container hits a horizontal wall with speed 200 m s–1 and angle 30° with the normal, and rebounds with the same speed. Is momentum conserved…

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A rain drop of radius 2 mm falls from a height of 500 m above the ground. It falls with decreasing acceleration (due to viscous resistance of the air) until at half its original height, it attains its maximum (terminal) speed, and moves with uniform speed thereafter. What is the work done by the gravitational force on the drop in the first and second half of its journey? What is the work done by the resistive force in the entire journey if its speed on reaching the ground is 10 m s–1? | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-6 Work, Energy And Power

Q.13:- A rain drop of radius 2 mm falls from a height of 500 m above the ground. It falls with decreasing acceleration (due to viscous resistance of the air) until…

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An electron and a proton are detected in a cosmic ray experiment, the first with kinetic energy 10 keV, and the second with 100 keV. Which is faster, the electron or the proton? Obtain the ratio of their speeds. (electron mass = 9.11 × 10–31 kg, proton mass = 1.67 × 10–27 kg, 1 eV = 1.60 × 10–19 J). | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-6 Work, Energy And Power

Q.12:- An electron and a proton are detected in a cosmic ray experiment, the first with kinetic energy 10 keV, and the second with 100 keV. Which is faster, the electron…

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A body constrained to move along the z-axis of a coordinate system is subject to a constant force F given byWhere i, j, k are unit vectors along the x-, y- and z-axis of the system respectively. What is the work done by this force in moving the body a distance of 4 m along the z-axis? | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-6 Work, Energy And Power

Q.11:- A body constrained to move along the z-axis of a coordinate system is subject to a constant force F given by Where i, j, k are unit vectors along…

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