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Develop a relation between the co-efficient of linear expansion, co-efficient superficial expansion and coefficient of cubical expansion of a

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A ball is dropped on a floor from a height of 2cm. After the collision, it rises up to a height of 1.5m. Assuming that 40% of mechanical energy lost goes to thermal energy into the ball. Calculate the rise in temperature of the ball in the collision. Specific heat capacity of the ball is 800J/k. Take `g =

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

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A bar of copper of length 75cm and a bar of length 125cm are joined end to end. Both are of circular cross – section with diameters 2cm. The free ends of copper and steel are maintained at `100^oc and 0^oc` respectively. The surfaces of the bars are thermally insulated. What is the temperature of copper – steel junction? Thermal conductivity of copper `= 9.2xx10^(-2)k cal |m|'^oc|s` and that of steel is `1.1xx10^(-2) k

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Show that average kinetic energy of translation per molecule of gas is directly proportional to the absolute temperature of

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Show that constant – temperature bulk modulus K of an ideal gas is the pressure P of the

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Two cylinders A and B of equal capacity are connected to each other via a stopcock. A contains a gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stopcock is suddenly opened. Answer the following : What is the change in

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

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Plot the corresponding reference circle for each of the following simple harmonic motions. Indicate the initial (t =0) position of the particle, the radius of the circle, and the angular speed of the rotating particle. For simplicity, the sense of rotation may be fixed to be anticlockwise in every case: (x is in cm and t is in s). (a) x = –2 sin (3t + π/3) (b) x = cos (π/6 – t) (c) x = 3 sin (2πt + π/4) (d) x = 2 cos

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

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The acceleration due to gravity on the surface of moon is 1.7 m `s^(–2)`. What is the time period of a simple pendulum on the surface of moon if its time period on the surface of earth is 3.5 s ? (g on the surface of earth is 9.8 m

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

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A stone dropped from the top of a tower of height 300 m splashes into the water of a pond near the base of the tower. When is the splash heard at the top given that the speed of sound in air is 340 m `s^(–1)` ? (g = 9.8 m

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

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You have learnt that a travelling wave in one dimension is represented by a function y = f (x, t) where x and t must appear in the combination x – v t or x + v t, i.e. y = f (x ± v t). Is the converse true? Examine if the following functions for y can possibly represent a travelling wave : (a) `(x – vt )^2` (b) `log [(x + vt)/x_0]` (c) 1/(x +

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

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A pipe 20 cm long is closed at one end. Which harmonic mode of the pipe is resonantly excited by a 430 Hz source ? Will the same source be in resonance with the pipe if both ends are open? (speed of sound in air is 340 m

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

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A travelling harmonic wave on a string is described by y(x, t) = 7.5 sin (0.0050x +12t + π/4) (a)what are the displacement and velocity of oscillation of a point at x = 1 cm, and t = 1 s? Is this velocity equal to the velocity of wave propagation? (b)Locate the points of the string which have the same transverse displacements and velocity as the x = 1 cm point at t = 2 s, 5 s and 11

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

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Earthquakes generate sound waves inside the earth. Unlike a gas, the earth can experience both transverse (S) and longitudinal (P) sound waves. Typically the speed of S wave is about 4.0 km `s^(–1)`, and that of P wave is 8.0 km `s^(–1)`. A seismograph records P and S waves from an earthquake. The first P wave arrives 4 min before the first S wave. Assuming the waves travel in straight line, at what distance does the earthquake occur

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

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The terminal velocity of a copper ball of radius 2.0 mm falling through a tank of oil at `20^o`C is 6.5 cm `s^(-1)`. Compute the viscosity of the oil at `20^o`C. Density of oil is `1.5 ×10^3` kg `m^(-3)`, density of copper is `8.9 × 10^3` kg

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

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A U-tube contains water and methylated spirit separated by mercury. The mercury columns in the two arms are in level with 10.0 cm of water in one arm and 12.5 cm of spirit in the other. What is the specific gravity of spirit

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

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In deriving Bernoulli’s equation, we equated the work done on the fluid in the tube to its change in the potential and kinetic energy. (a) What is the largest average velocity of blood flow in an artery of diameter `2 × 10^(–3)` m if the flow must remain laminar ? (b) Do the dissipative forces become more important as the fluid velocity increases ? Discuss

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

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Choose the correct alternative: (a) If the zero of potential energy is at infinity, the total energy of an orbiting satellite is negative of its kinetic/potential energy. (b) The energy required to launch an orbiting satellite out of earth’s gravitational influence is more/less than the energy required to project a stationary object at the same height (as the satellite) out of earth’s

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

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A comet orbits the sun in a highly elliptical orbit. Does the comet have a constant (a) linear speed, (b) angular speed, (c) angular momentum, (d) kinetic energy, (e) potential energy, (f) total energy throughout its orbit? Neglect any mass loss of the comet when it comes very close to the

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

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Three bodies, a ring, a solid cylinder and a solid sphere roll down the same inclined plane without slipping. They start from rest. The radii of the bodies are identical. Which of the bodies reaches the ground with maximum

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

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Torques of equal magnitude are applied to a hollow cylinder and a solid sphere, both having the same mass and radius. The cylinder is free to rotate about its standard axis of symmetry, and the sphere is free to rotate about an axis passing through its centre. Which of the two will acquire a greater angular speed after a given

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

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