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A telescope has an objective lens of focal length 200 cm and an eyepiece with focal length 2 cm. It is used to see a 50 m tall building at a distance of 2 km. What is the height of the image of building formed by the objective lens?
27
Oct
A telescope has an objective lens of focal length 200 cm and an eyepiece with focal length 2 cm. It is used to see a 50 m tall building at a distance of 2 km. What is the height of the image of building formed by the objective lens? respectively What should be the maximum [...]
The radiation emitted by a star A is 10000 times that of the sun. If the surface temperatures of the sun and star A are 60000 K and 2000 K, respectively, the ratio of the radii of the
25
Oct
The radiation emitted by a star A is 10000 times that of the sun. If the surface temperatures of the sun and star A are 60000 K and 2000 K, respectively, the ratio of the radii of the respectively The radiation emitted by a star A is 10000 times that of the sun. If the [...]
A glass vessel is filled up to 3/5th of its volume by mercury. If the volume expansivities of glass and mercury be 9 * 10^-6/C and 18 * 10^-5/C, respectively, then the coefficient of apparent
24
Oct
A glass vessel is filled up to 3/5th of its volume by mercury. If the volume expansivities of glass and mercury be 9 * 10^-6/C and 18 * 10^-5/C, respectively, then the coefficient of apparent A glass vessel is filled up to 3/5th of its volume by mercury. If the volume expansivities of glass and [...]
In a vertical U-tube containing a liquid, the two arms are maintained at different temperatures t1 and t2. The liquid columns in the two arms have heights l1 and l2, respectively.
23
Oct
In a vertical U-tube containing a liquid, the two arms are maintained at different temperatures t1 and t2. The liquid columns in the two arms have heights l1 and l2, respectively. In a vertical U-tube containing a liquid respectively the two arms are maintained at different temperatures t1 and t2. The liquid columns in the [...]
Equal volumes of three liquids of densities rho 1, rho 2 and rho 3, specific heat capacities c1, c2 and c3 and temperatures t1, t2 and t3, respectively, are mixed together. What is the
23
Oct
Equal volumes of three liquids of densities rho 1, rho 2 and rho 3, specific heat capacities c1, c2 and c3 and temperatures t1, t2 and t3, respectively, are mixed together. What is the are mixed together. What is the c2 and c3 and temperatures t1 Equal volumes of three liquids of densities rho 1 [...]
What should be the maximum acceptance angle at the aircore interface of an optical fibre if n1 and n2 are the refractive indices of the core and the cladding, respectively?
23
Oct
What should be the maximum acceptance angle at the aircore interface of an optical fibre if n1 and n2 are the refractive indices of the core and the cladding, respectively? respectively What should be the maximum acceptance angle at the aircore interface of an optical fibre if n1 and n2 are the refractive indices of [...]
Two blocks of masses 1kg and 3kg are moving with velocities 2m/s and 1m/s , respectively , as shown. If the spring constant is 75N/m , the maximum compression of the spring is
22
Oct
Two blocks of masses 1kg and 3kg are moving with velocities 2m/s and 1m/s , respectively , as shown. If the spring constant is 75N/m , the maximum compression of the spring is as shown. If the spring constant is 75N/m respectively the maximum compression of the spring is Two blocks of masses 1kg and [...]
A ball , moving with a speed of 10 3–√m/s , strikes an identical stationary ball such that after the collision , the direction of each ball makes an angle of 30^∘ with the original line of motion. The speeds of two balls after the collision are , respectively.
22
Oct
A ball , moving with a speed of 10 3–√m/s , strikes an identical stationary ball such that after the collision , the direction of each ball makes an angle of 30^∘ with the original line of motion. The speeds of two balls after the collision are , respectively. A ball moving with a speed [...]
A steel ball of radius 2cm is at rest on a frictionless surface. Another ball of radius 4cm moving at a velocity of 81cm/see collides elastically with first ball. After collision the smaller ball moves with speed of
22
Oct
A steel ball of radius 2cm is at rest on a frictionless surface. Another ball of radius 4cm moving at a velocity of 81cm/see collides elastically with first ball. After collision the smaller ball moves with speed of A body of mass m1 moving with a velocity 3m/s collides with another body at rest of [...]
A body of mass m1 moving with a velocity 3m/s collides with another body at rest of m2 . After collision the velocities of the two bodies are 2m/s and 5m/s , respectively , along the direction of motion of m1. The ratio m1/m2 is
22
Oct
A body of mass m1 moving with a velocity 3m/s collides with another body at rest of m2 . After collision the velocities of the two bodies are 2m/s and 5m/s , respectively , along the direction of motion of m1. The ratio m1/m2 is A body of mass m1 moving with a velocity 3m/s [...]