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Dependence of intensity of gravitational field `(E)` of earth with distance `(r)` from centre of earth is correctly represented

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

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Acceleration due to gravityThe acceleration for any object moving under the sole influence of gravity is known as acceleration due to gravity. So, for an object of mass `m,` the acceleration experienced by it is usually denoted by the symbol g which is related to F by Newton’s second law by relation `F= mg`. Thus,`g=F/m=(GM_e)/(r_e^2)`Acceleration `g` is readily measurable as `R_e` is a known quantity. The measurement of `G` by Cavendish’s experiment (or otherwise), combined with knowledge of `g and R_e` enables one to estimate `M_e` from the above equation. This is the reason why there is a popular statement

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

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Springs is spring constant K, 2K, 4K,

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

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Two identical springs of spring constant k are attached to a block of mass m and to fixed supports as shown in Fig.. Show that when the mass is displaced from its equilibrium position on either side, it executes a simple harmonic motion. Find the period of oscillations.

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

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For the travelling harmonic wave y(x, t) = 2.0 cos 2π (10t – 0.0080 x + 0.35) where x and y are in cm and t in s. Calculate the phase difference between oscillatory motion of two points separated by a distance of (a) 4 m, (b) 0.5 m, (c) λ/2, (d)

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

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Fill in the blanks using the word(s) from the list appended with each statement: Viscosity of gases ... with temperature, whereas viscosity of liquids ... with temperature (increases /

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

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Fill in the blanks using the word(s) from the list appended with each statement: For a fluid in a steady flow, the increase in flow speed at a constriction follows (conservation of mass / Bernoulli’s

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

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A bullet of mass 10 g and speed 500 m/s is fired into a door and gets embedded exactly at the centre of the door. The door is 1.0 m wide and weighs 12 kg. It is hinged at one end and rotates about a vertical axis practically without friction. Find the angular speed of the door just after the bullet embeds into it. (Hint: The moment of inertia of the door about the vertical axis at one end is

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

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Two identical springs of spring constant K are attached to a block of mass m and to fixed supports as shown in Fig. . When the mass is displaced from equilllibrium position by a distance x towards right, find the restoring

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

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Attempt to formulate your ‘moral’ views on the practice of science. Imagine yourself stumbling upon a discovery, which has great academic interest but is certain to have nothing but dangerous consequences for the human society. How, if at all, will you resolve your dilemma

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

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5.74 g of a substance occupies `1.2 cm^3`. Express its density by keeping the significant figures in

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

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Estimate the average mass density of a sodium atom assuming its size to be about 2.5 Å. (Use the known values of Avogadro’s number and the atomic mass of sodium). Compare it with the density of sodium in its crystalline phase : 970 kg `m^(–3)`. Are the two densities of the same order of magnitude ? If so, why

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

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Name physical quantities whose units are electron volt and

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Projectile motion is a form of motion in which an object or particle is thrown with some initial velocity near the earth’s surface and it moves along a curved path under the action of gravity alone. The path followed by a projectile is called its trajectory, which is shown below. When a projectile is projected obliquely, then its trajectory is as shown in the figure below Here velocity `u` is resolved into two components, we get (a) `u cos theta` along `OX` and (b) `u sin theta` along `OY`.In above case, the distance from the thrower to the point where

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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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 spring when stretched through a distance `x` is `10 J`. What is the amount of work done on the same spring to stretch it through an additional distance

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

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The angular acceleration of a flywheel of mass 5 kg and radius of gyration `0.5 m` is ........... , if a torque of `10N-m` is applied on

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

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Cavendish’s ExperimentThe figure shows the schematic drawing of Cavendish’s experiment to determine the value of the gravitational constant. The bar AB has two small lead spheres attached at its ends. The bar is suspended from a rigid support by a fine wire.Two large lead spheres are brought close to the small ones but on opposite sides as shown. The value of G from this experiment came to be `6.67 xx 10^(-11) N-m^2'/'kg^2`.The net force on the bar

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

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Acceleration due to gravityThe acceleration for any object moving under the sole influence of gravity is known as acceleration due to gravity. So, for an object of mass `m,` the acceleration experienced by it is usually denoted by the symbol g which is related to F by Newton’s second law by relation `F= mg`. Thus,`g=F/m=(GM_e)/(r_e^2)`Acceleration `g` is readily measurable as `R_e` is a known quantity. The measurement of `G` by Cavendish’s experiment (or otherwise), combined with knowledge of `g and R_e` enables one to estimate `M_e` from the above equation. This is the reason why there is a popular statement

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

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If the splash is heard 4.23 seconds after a stone is dropped into a well. 78.4 metes deep, find the velocity of sound in

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

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