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If the value of work done is `10^(10)g-cm^ 2 s^(-2)`, then its value in SI units will

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The length, breadth and height of a rectangular block of wood were measured to be `l= 12.13 ± 0.02 cm, b = 8.16 ± 0.01 cm and h = 3.46 ± 0.01

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In successive experiments while measuring the period of oscillation of a simple pendulum. The readings turn out to be `2.63 s, 2.56 s, 2.42 s, 2.71s and 2.80 s.` Calculate the mean absolute

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The solid angle subtended by the periphery of an area `1 cm^2` at a point situated symmetrically at a distance of 5 cm from the area i s ...........

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Assertion The unit used for measuring nuclear cross-section is ‘barn’. Reason 1 barn `= 10^(-14)

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Assertion: Special functions such as trigonometric, logarithmic and exponential functions are not dimensionless. Reason: A pure number, ratio of similar physical quantities, such as angle and refractive index, has some

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Assertion: The method of dimensions analysis cannot validate the exact relationship between physical quantities in any equation. Reason: It does not distinguish between the physical quantities having same

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Assertion: The speed of a body can be negative. Reason: If the body is moving in the opposite direction of positive motion, then its speed is

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Unit vector in the direction of the resultant of vectors `A=-3hati-2hatj-3hatk and B = 2hati + 4hatj + 6hatk`

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If `A=B+C` have scalar magnitudes of 5, 4, 3 units respectively, then the angle between `A and C`

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For two vectors `A and B, |A + B| = |A - B|` is always true,

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Three vectors are given as `P = 3hati - 4hatj ,Q = 6 hati - 8 hatj and R = (3/4) hati - hatj`, then which of the following is

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The angle `theta` between the vector `p=hati + hatj + hatk` and unit vector along X-axis

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Two vectors `P and Q` are inclined at an angle `theta and R` is their resultant as shown in the figure.Keeping the magnitude and the angle of the vectors same, if the direction of `P and Q` is interchanged, then their is a change in which of the following with regard to

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

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Vectors are the physical quantities which have both magnitudes and directions and obey the triangle/parallelogram laws of addition and subtraction. It is specified by giving its magnitude by a number and its direction, e.g. Displacement, acceleration, velocity, momentum, force, etc. A vector is represented by a bold face type and also by an arrow placed over a letter, i.e. `F, a, b` or `vecF,veca,vecb`.The length of the line gives the magnitude and the arrowhead gives the direction.The point P is called head or terminal point and point 0 is called tail or initial point of the vector OP.`| lambda A|

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

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Relative Velocity Every motion is relative as it has to be observed with respect to an observer. Relative velocity is a measurement of velocity of an object with respect to other observer. It is defined as the time rate of change of relative position of one object with respect to another.For example, if rain is falling vertically with a velocity `v_r` and a man is moving horizontally with `v_m`, the man can protect himself from the rain if he holds his umbrella in the direction of relative velocity of rain w.r.t. man.Two bodies are held separated by 9.8 m vertically

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According to Galileo’s experiment for a double inclined plane that are smooth, when a ball is released from rest on one of the planes rolls down and climb up the other of decreased slope, the final height of the ball

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

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Momentum of a body is the quantity of motion possessed by the body. It depends on the mass of the body and the velocity with which it moves.When a bullet is fired by a gun, it can easily pierce human tissue before coming to rest resulting in casualty. The same bullet fired with moderate speed will not cause much damage. The greater the change in momentum in a given time, the greater is the force that needs to be applied. The second law of motion refers to the general situation, where there is a net external force rating on the

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

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Momentum of a body is the quantity of motion possessed by the body. It depends on the mass of the body and the velocity with which it moves.When a bullet is fired by a gun, it can easily pierce human tissue before coming to rest resulting in casualty. The same bullet fired with moderate speed will not cause much damage. The greater the change in momentum in a given time, the greater is the force that needs to be applied. The second law of motion refers to the general situation, where there is a net external force rating on the

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 unidirectional force F varying with

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

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