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Assertion: At the microscopic level, all bodies are made up of charged constituents (like nuclei and electrons) and various contact forces exist between them. Reason: These forces are due to elasticity of bodies, molecular collisions and impacts,

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Conservation of Momentum This principle is a consequence of Newton’s second and third laws of motion.In an isolated system (i.e. a system having no external force), mutual forces (called internal forces) between pairs of particles in the system causes momentum change in individual particles.Let a bomb be at rest, then its momentum will be zero. If the bomb explodes into two equal parts, then the parts fly off in exactly opposite directions with same speed, so that the total momentum is still zero. Here, no external force is applied on the system of particles (bomb).A bullet of mass 0.1 kg

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Conservation of Momentum This principle is a consequence of Newton’s second and third laws of motion.In an isolated system (i.e. a system having no external force), mutual forces (called internal forces) between pairs of particles in the system causes momentum change in individual particles.Let a bomb be at rest, then its momentum will be zero. If the bomb explodes into two equal parts, then the parts fly off in exactly opposite directions with same speed, so that the total momentum is still zero. Here, no external force is applied on the system of particles (bomb).Two masses of `M and 4M`

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Force of Friction on Connected Bodies When bodies are in contact, there are mutual contact forces satisfying the third law of motion. The component of contact force normal to the surfaces in contact is called normal reaction. The component parallel to the surfaces in contact is called friction.In the above figure, `8 kg and 6 kg` are hanging stationary from a rough pulley and are about to move. They are stationary due to roughness of the pulley.Which force is acting between pulley and

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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`300J` of work is done in sliding a 2 kg block up an inclined plane of height 10 m (taking, `g=10 ms^(-2)`). Work done against friction

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A man can do work of `600J` in 2 min, then man’s power

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A 60 HP electric motor lifts an elevator having a maximum total load capacity of `2000 kg`. If the frictional force on the elevator is `4000 N`, the speed of the elevator at full load is close to (take, `1 HP = 746 W and g=10

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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For a system to follow the law of conservation of linear momentum during a collision, the condition is I. total external force acting on the system is zero II. total external force acting on the system is finite and time of collision is negligible III. total internal force acting on the system is

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There are many types of spring. Important among these are helical and spiral springs as shown in figure.(a) (b) Usually, we assume that the springs are massless. Therefore, work done is stored in the spring in the form of elastic potential energy of the spring. Thus, potential energy of a spring is the energy associated with the state of compression or expansion of an elastic spring.The potential energy, i.e. `U(x)` can be assumed zero

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A force `F=5hati + 2hatj - 5hatk` acts on a particle whose position vector is `r =hati - 2hatj + hatk`. What is the torque about the origin

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ABC is an equilateral triangle with `O` as its centre. `F_1, F_2 and F_3` represent three forces acting along the sides `AB, BC and AC,` respectively. If the total torque about `O` is zero, then the magnitude of `F_3`

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One solid sphere A and another hollow sphere B are of same mass and same outer radius. Their moments of inertia about their diameters are `I_A and I_B` respectively, such

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A disc of mass M and radius R is rotating about one of its diameter. The value of radius of gyration for the disc

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A solid sphere is rotating freely about its symmetry axis in free space. The radius of the sphere is increased keeping its mass same. Which of the following physical quantities would remain constant for the

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: If a particle moves with a constant velocity, then angular momentum of this particle about any point remains constant. Reason: Angular momentum does not have the units of Planck’s

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Two point masses `m_1 and m^2` are separated by a distance `r`. The gravitational potential energy of the system is `G_1`. When the separation between the particles is doubled, the gravitational potential energy is `G_2` . Then, the ratio of `G_1/G_2`

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Gravitational potential energy of a system of particles as shown in the figure

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An object is thrown from the surface of the moon. The escape speed for the object

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A body is projected vertically upwards from the surface of a planet of radius `R` with a velocity equal to 1/3rd of the escape velocity for the planet. The maximum height attained by the body

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Study the following statements and choose the incorrect option. I. `G` is not equal to `6.67 xx 10^(-11)Nm^(-2)kg^(-2)` on the surface of earth.II. The escape velocity on the surface of earth is lesser than the escape velocity from moon’s surface. III. The angular momentum of a satellite going around the earth remains conserved.IV. The relation, `g=(GM)/r^2` holds good for r all the celestial

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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