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Assertion: According to the law of conservation of mechanical energy, change in potential energy is equal and opposite to the change in kinetic energy. Reason: Mechanical energy is not

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

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Assertion: Decrease in mechanical energy is more in case of an object sliding up a relatively less inclined plane due to friction.Reason: The coefficient of friction between the block and the surface decreases with the increase in the angle of

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

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Assertion: For looping a vertical loop of radius `r`, the minimum velocity at lowest point should be `sqrt(5gr)`. Reason: In this event, the velocity at the highest point will be

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

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Assertion: Kilowatt-hour is the unit of energy. Reason: One kilowatt hour is equal to `3.6 xx 10^6

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

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Assertion: There is no loss in energy in elastic collision. Reason: Linear momentum is conserved in elastic

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

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Assertion: Quick collision between two bodies is more violent than a slow collision; even when the initial and final velocities are identical. Reason: The momentum is greater in first

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

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Assertion: Two particles are moving in the same direction do not lose all their energy in completely inelastic collision. Reason: Principle of conservation of momentum does not holds true for all kinds of

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

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Work A farmer ploughing the field, a construction worker carrying bricks, a student studying for a competitive examination, an artist painting a beautiful landscape, all are said to be working. In physics, however, the word ‘Work’ covers a definite and precise meaning. Work refers to the force and the displacement over which it acts. Consider a constant force `F` acting on an object of mass `m`. The object undergoes a displacement `d` in the positive `x`-direction as shown in figure.The work done by the force is defined to be the product of component of the force in the direction of

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

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Work A farmer ploughing the field, a construction worker carrying bricks, a student studying for a competitive examination, an artist painting a beautiful landscape, all are said to be working. In physics, however, the word ‘Work’ covers a definite and precise meaning. Work refers to the force and the displacement over which it acts. Consider a constant force `F` acting on an object of mass `m`. The object undergoes a displacement `d` in the positive `x`-direction as shown in figure.The work done by the force is defined to be the product of component of the force in the direction of

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

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Work A farmer ploughing the field, a construction worker carrying bricks, a student studying for a competitive examination, an artist painting a beautiful landscape, all are said to be working. In physics, however, the word ‘Work’ covers a definite and precise meaning. Work refers to the force and the displacement over which it acts. Consider a constant force `F` acting on an object of mass `m`. The object undergoes a displacement `d` in the positive `x`-direction as shown in figure.The work done by the force is defined to be the product of component of the force in the direction of

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

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Work A farmer ploughing the field, a construction worker carrying bricks, a student studying for a competitive examination, an artist painting a beautiful landscape, all are said to be working. In physics, however, the word ‘Work’ covers a definite and precise meaning. Work refers to the force and the displacement over which it acts. Consider a constant force `F` acting on an object of mass `m`. The object undergoes a displacement `d` in the positive `x`-direction as shown in figure.The work done by the force is defined to be the product of component of the force in the direction of

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

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Work A farmer ploughing the field, a construction worker carrying bricks, a student studying for a competitive examination, an artist painting a beautiful landscape, all are said to be working. In physics, however, the word ‘Work’ covers a definite and precise meaning. Work refers to the force and the displacement over which it acts. Consider a constant force `F` acting on an object of mass `m`. The object undergoes a displacement `d` in the positive `x`-direction as shown in figure.The work done by the force is defined to be the product of component of the force in the direction of

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

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Kinetic Energy The energy possessed by a body by virtue of its motion is called kinetic energy. In other words, the amount of work done, a moving object can do before coming to rest is equal to its kinetic energy.`.^..' '` Kinetic energy, `KE =1/2mv^2` where, `m` is a mass and `v` is the velocity of a body.The units and dimensions of KE are Joule (in SI) and `[ML^2T^(-2)]`, respectively. Kinetic energy of a body is always positive. It can never be negative.Which of the diagrams shown in figure most closely shows the variation in kinetic

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

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Kinetic Energy The energy possessed by a body by virtue of its motion is called kinetic energy. In other words, the amount of work done, a moving object can do before coming to rest is equal to its kinetic energy.`.^..' '` Kinetic energy, `KE =1/2mv^2` where, `m` is a mass and `v` is the velocity of a body.The units and dimensions of KE are Joule (in SI) and `[ML^2T^(-2)]`, respectively. Kinetic energy of a body is always positive. It can never be negative.A force which is inversely proportional to the speed is acting on a body.

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

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Kinetic Energy The energy possessed by a body by virtue of its motion is called kinetic energy. In other words, the amount of work done, a moving object can do before coming to rest is equal to its kinetic energy.`.^..' '` Kinetic energy, `KE =1/2mv^2` where, `m` is a mass and `v` is the velocity of a body.The units and dimensions of KE are Joule (in SI) and `[ML^2T^(-2)]`, respectively. Kinetic energy of a body is always positive. It can never be negative.The kinetic energy of an air molecule `(10^(-21) J)` in `eV`

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

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Kinetic Energy The energy possessed by a body by virtue of its motion is called kinetic energy. In other words, the amount of work done, a moving object can do before coming to rest is equal to its kinetic energy.`.^..' '` Kinetic energy, `KE =1/2mv^2` where, `m` is a mass and `v` is the velocity of a body.The units and dimensions of KE are Joule (in SI) and `[ML^2T^(-2)]`, respectively. Kinetic energy of a body is always positive. It can never be negative.Two masses of `1 g and 4 g` are moving with equal kinetic energy.

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

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Kinetic Energy The energy possessed by a body by virtue of its motion is called kinetic energy. In other words, the amount of work done, a moving object can do before coming to rest is equal to its kinetic energy.`.^..' '` Kinetic energy, `KE =1/2mv^2` where, `m` is a mass and `v` is the velocity of a body.The units and dimensions of KE are Joule (in SI) and `[ML^2T^(-2)]`, respectively. Kinetic energy of a body is always positive. It can never be negative.An object of mass `10 kg` is moving with velocity of `10 ms^(-1)`. Due

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

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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 of a body is increases in which of the following

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

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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

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

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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 ratio of spring constants of two springs is 2 : 3. What is the ratio of their potential energy, if they are stretched by the same

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

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