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A mild steel wire of length 1.0 m and cross-sectional area `0.50 × 10^(-2)` c`m^2` is stretched, well within its elastic limit, horizontally between two pillars. A mass of 100 g is suspended from the mid-point of the wire. Calculate the depression at the

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

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Answer the following : An astronaut inside a small space ship orbiting around the earth cannot detect gravity. If the space station orbiting around the earth has a large size, can he hope to detect gravity

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

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Answer the following : If you compare the gravitational force on the earth due to the sun to that due to the moon, you would find that the Sun’s pull is greater than the moon’s pull. (you can check this yourself using the data available in the succeeding exercises).

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

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In the following two exercises, choose the correct answer from among the given ones: The gravitational intensity at the centre of a hemispherical shell of uniform mass density has the direction indicated by the arrow (see Fig 8.12) (i) a, (ii) b, (iii) c, (iv) 0.

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

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A body weighs 63 N on the surface of the earth. What is the gravitational force on it due to the earth at a height equal to half the radius of the earth

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

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What is the moment of inertia of a rod of mass M, length l about an axis perpendicular to it through one

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What is the moment of inertia of a ring about a tangent to the circle of the

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Find the scalar and vector products of two vectors. `a=(3hati-4hatj+5hat)` and

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Show that the area of the triangle contained between the vectors a and b is one half of the magnitude of a ×

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A hoop of radius 2 m weighs 100 kg. It rolls along a horizontal floor so that its centre of mass has a speed of 20 cm/s. How much work has to be done to stop

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

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Separation of Motion of a system of particles into motion of the centre of mass and motion about the centre of mass : Show `(dL')/(dt)=sum r'_1xx(dp')/(dt)` Further, show that `(dL')/(dt)=τ'_(ext)` where `τ'_(ext)` is the sum of all external torques acting on the system about the centre of mass. (Hint

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

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Motion of a ball bearing inside a smooth curved bowl, when released from a point slightly above the lower point

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A body is performing S.H.M. Then

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Let us consider an equation `1/2mv^2=mgh` where m is the mass of the body, v its velocity, g is the acceleration due to gravity and h is the height. Check whether this equation is dimensionally

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

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Consider a simple pendulum, having a bob attached to a string, that oscillates under the action of the force of gravity. Suppose that the period of oscillation of the simple pendulum depends on its length (l), mass of the bob (m) and acceleration due to gravity (g). Derive the expression for its time period using method of

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

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Fill in the blanks The relative density of lead is 11.3. Its density is ....g `cm^(–3)` or ....kg

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Explain this statement clearly : “To call a dimensional quantity ‘large’ or ‘small’ is meaningless without specifying a standard for comparison”. In view of this, reframe the following statements wherever necessary : (a) the mass of Jupiter is very large (b) the air inside this room contains a large

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

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The length, breadth and thickness of a rectangular sheet of metal are 4.234 m, 1.005 m, and 2.01 cm respectively. Give the area and volume of the sheet to correct significant

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The number of significant figures in 0.06900

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Which of the following ratios express

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

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