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A ball is thrown vertically downwards from a height of 20 m with an initial velocity υ0. It collides with the ground, loses 50 percent of its energy in collision and rebounds to the same height. The initial velocity υ0 is (Take g=10ms^−2)
28
Aug
A ball is thrown vertically downwards from a height of 20 m with an initial velocity υ0. It collides with the ground, loses 50 percent of its energy in collision and rebounds to the same height. The initial velocity υ0 is (Take g=10ms^−2) A ball is thrown vertically downwards from a height of 20 m [...]
Two particles of masses m1,m2 move with initial velocities u1 and u2. On collision, one of the particles get excited to higher level, after absorbing energy ϵ. If final velocities of particles be v1 and v2 then we must have
28
Aug
Two particles of masses m1,m2 move with initial velocities u1 and u2. On collision, one of the particles get excited to higher level, after absorbing energy ϵ. If final velocities of particles be v1 and v2 then we must have after absorbing energy ϵ. If final velocities of particles be v1 and v2 then we [...]
A river is flowing with a speed of 1 km/h^-1 A swimmer wants to go point C starting from A. He swims with a speed of 5 km/h^-1 at an angle theta w.r.t. the river flow. If AB = BC = 400 m, at what angle with the river bank should the swimmer swim ?
28
Aug
A river is flowing with a speed of 1 km/h^-1 A swimmer wants to go point C starting from A. He swims with a speed of 5 km/h^-1 at an angle theta w.r.t. the river flow. If AB = BC = 400 m, at what angle with the river bank should the swimmer swim ? [...]
A vertical U-tube is spinned about the vertical axis passing through the left hand limb, with an angular speed ω such that the liquid columns in the limbs have heights h and 3h, as shown in the figure. Find the value of to ω.
28
Aug
A vertical U-tube is spinned about the vertical axis passing through the left hand limb, with an angular speed ω such that the liquid columns in the limbs have heights h and 3h, as shown in the figure. Find the value of to ω. A vertical U-tube is spinned about the vertical axis passing through [...]
Two identical balls A and B having velocities of 0.5 m/s and -0.3 m/s respectively collide elastically in one dimension. The velocities of B and A after the collision respectively will be
28
Aug
Two identical balls A and B having velocities of 0.5 m/s and -0.3 m/s respectively collide elastically in one dimension. The velocities of B and A after the collision respectively will be Two identical balls A and B having velocities of 0.5 m/s and -0.3 m/s respectively collide elastically in one dimension. The velocities of [...]
A boat moves relative to water with a velocity v which is n times less than the river flow velocity u. At what angle to the stream direction must the boat move to minimize drifting ?
28
Aug
A boat moves relative to water with a velocity v which is n times less than the river flow velocity u. At what angle to the stream direction must the boat move to minimize drifting ? A boat moves relative to water with a velocity v which is n times less than the river flow [...]
A vertical U-tube has two liquid 1 and 2. The height of liquids columns in both the limbs are h and 2h, as shown in the figure. If the density of the liquid 1 is 2ρ. a. Find the density of liquid 2. b. If we accelerate the tube towards right till the heights of liquid columns will be the same, find the acceleration of the tube
28
Aug
A vertical U-tube has two liquid 1 and 2. The height of liquids columns in both the limbs are h and 2h, as shown in the figure. If the density of the liquid 1 is 2ρ. a. Find the density of liquid 2. b. If we accelerate the tube towards right till the heights of [...]
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A vertical U-tube has two liquid 1 and 2. The height of liquids columns in both the limbs are h and 2h ,
as shown in the figure. If the density of the liquid 1 is 2ρ. a. Find the density of liquid 2. b. If we accelerate the tube towards right till the heights of liquid columns will be the same ,
find the acceleration of the tube ,
(a) In which direction should the motorboat given in Illustration 5.46 head in order to reach a point on the opposite bank directly east from the starting point ? The boat’s speed relative to the water remains 4 ms^-1. (b) What is the velocity of the boat relative to the earth ? ( c) How much time is required to cross the river ?
28
Aug
(a) In which direction should the motorboat given in Illustration 5.46 head in order to reach a point on the opposite bank directly east from the starting point ? The boat’s speed relative to the water remains 4 ms^-1. (b) What is the velocity of the boat relative to the earth ? ( c) How [...]
An ice cube of side 1 cm is floating at the interface of kerosene and water in a beaker of base area 10cm^2 . The level of kerosene is just covering the top surface of the ice cube. a. Find the depth of submergence in the kerosene and that in the water. b. Find the change in the total level of the liquid when the whole ice melts into water.
28
Aug
An ice cube of side 1 cm is floating at the interface of kerosene and water in a beaker of base area 10cm^2 . The level of kerosene is just covering the top surface of the ice cube. a. Find the depth of submergence in the kerosene and that in the water. b. Find the [...]
A river flows due south with a speed of 2.0 ms^-1. A man strees a motorboat across the river , his velocity relative to the water is 4 m s^-1 due east. The river is 800 m wide. (a) What is his velocity (magnitude and direction) relative to the earth ? (b) How much time is required to cross the river ? ( c) HOw far south of his starting points will he reach the opposite bank ?
28
Aug
A river flows due south with a speed of 2.0 ms^-1. A man strees a motorboat across the river , his velocity relative to the water is 4 m s^-1 due east. The river is 800 m wide. (a) What is his velocity (magnitude and direction) relative to the earth ? (b) How much time [...]