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The kinetic energy of an object of mass, m moving with a velocity of 5 m s −1 is 25 J. What will be its kinetic energy
Expression for kinetic energy Ek= ½ mv2 m = Mass of object v = Velocity of the object in ms−1 Given that kinetic energy, Ek=25J (i) If the velocity of an object is doubled, then...
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(a) Define kinetic energy of an object. Can kinetic energy of an object be negative? Give reason.
(a) Kinetic energy of an object is defined as the energy possessed by a body by virtue of its motion. It is given by, K.E = 1/2 mv2 No, the kinetic energy...
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Underline the correct alternative: Work done by a body against friction always results in a loss of its kinetic/potential energy.
Kinetic energy The work done against the direction of friction reduces the velocity of a body. Hence, there is a loss of kinetic energy of the body.
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In an inelastic collision, the final kinetic energy is always less than the initial kinetic energy of the system.
True In an inelastic collision, the final kinetic energy is always less than the initial kinetic energy of the system. This is because in such collisions, there is always a loss...
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Choose the correct alternative: If the zero of potential energy is at infinity, the total energy of an orbiting satellite is negative of its kinetic,
Kinetic energy Less Total mechanical energy of a satellite is the sum of its kinetic energy (always positive) and potential energy (may be negative). At infinity, the gravitational potential energy of the...
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In a simple harmonic oscillator, at the mean position (a) kinetic energy is minimum, potential energy is maximum.
(c) : In a simple harmonic oscillator, kinetic energy is maximum and potential energy is minimum at mean position.
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The magnitude of gravitational potential energy of the moon-earth system is U with zero potential energy at infinite separation.
(b ) U>K. EXPLANATION: Let the mass of the moon = m, velocity v and its distance from the earth = a. v = √(GM/a), K.E. = K = ½mv² = ½m*GM/a →GMm/a = 2K The...
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In a simple harmonic motion (a) the potential energy is always equal to the kinetic energy.
(d) the average potential energy in one time period equal to the average kinetic energy in this period. EXPLANATION: The sum of K.E. and P.E. is constant, they are not equal. (a)...
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In a simple harmonic motion (a) the maximum potential energy equals the maximum kinetic energy
(a) the maximum potential energy equals the maximum kinetic energy (b) the minimum potential energy equals the minimum kinetic energy EXPLANATION: Minimum P.E. and minimum K.E. are respectively at the mean position and at...
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In case of nitrogen, NCl3 is possible but not NCl5 while in case of phosphorus, PCl3 as well as PCl5 are possible.
(a) : 7N = 1s2 2s2 3p3 15P = 1s2 2s2 2p6 3s2 3p3 In phosphorus the 3dorbitals are available.
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