Part 1
A mass of 1kg is suspended by means of a thread. The system is (i) lifted up with an acceleration of 4.9ms^−1 . (ii) lowered with an acceleration of 4.9ms^−2 . The ratio of tension in the first and second case is
27
Nov
A mass of 1kg is suspended by means of a thread. The system is (i) lifted up with an acceleration of 4.9ms^−1 . (ii) lowered with an acceleration of 4.9ms^−2 . The ratio of tension in the first and second case is A block of mass m starting from rest slides down a smooth inclined [...]
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A block of mass m starting from rest slides down a smooth inclined plane of gradient θ ,
fixed in a lift moving upwards with an acceleration a0 as shown in figure. If the base of the inclined plane has length L ,
the time taken by the block to slide from top to bottom of the inclined plane ,
will be ,
A man sits on a chair supported by a rope passing over a frictionless fixed pulley. The man who weighs 1000 N exerts a force of 450 N on the chair downwards while pulling on the rope. If the chair weighs 250 N and g is 10ms^−2, then the acceleration of the chair is
27
Nov
A man sits on a chair supported by a rope passing over a frictionless fixed pulley. The man who weighs 1000 N exerts a force of 450 N on the chair downwards while pulling on the rope. If the chair weighs 250 N and g is 10ms^−2, then the acceleration of the chair is A [...]
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A block of mass m starting from rest slides down a smooth inclined plane of gradient θ ,
fixed in a lift moving upwards with an acceleration a0 as shown in figure. If the base of the inclined plane has length L ,
the time taken by the block to slide from top to bottom of the inclined plane ,
will be ,
A person in an elevator accelerating upwards with an acceleration of 2 ms^−2 , tosses a coin vertically upwards with a speed of 20 ms^−1 . After how much time will the coin fall back into his hand? (Take g=10ms^−2)
27
Nov
A person in an elevator accelerating upwards with an acceleration of 2 ms^−2 , tosses a coin vertically upwards with a speed of 20 ms^−1 . After how much time will the coin fall back into his hand? (Take g=10ms^−2) A person in an elevator accelerating upwards with an acceleration of 2 ms^−2 tosses a [...]
A boy of mass 40 kg is climbing a vertical pole at a constant speed. If the coefficient of friction between his palms and the pole is 0.8 and g=10m/s^2, the horizontal force that he is applying on the pole is
27
Nov
A boy of mass 40 kg is climbing a vertical pole at a constant speed. If the coefficient of friction between his palms and the pole is 0.8 and g=10m/s^2, the horizontal force that he is applying on the pole is A boy of mass 40 kg is climbing a vertical pole at a constant [...]
A block of mass m starting from rest slides down a smooth inclined plane of gradient θ, fixed in a lift moving upwards with an acceleration a0 as shown in figure. If the base of the inclined plane has length L, the time taken by the block to slide from top to bottom of the inclined plane, will be
27
Nov
A block of mass m starting from rest slides down a smooth inclined plane of gradient θ, fixed in a lift moving upwards with an acceleration a0 as shown in figure. If the base of the inclined plane has length L, the time taken by the block to slide from top to bottom of the [...]
Tags:
A block of mass m starting from rest slides down a smooth inclined plane of gradient θ ,
fixed in a lift moving upwards with an acceleration a0 as shown in figure. If the base of the inclined plane has length L ,
the time taken by the block to slide from top to bottom of the inclined plane ,
will be ,
Two black bodies at temperatures 327ºC and 427ºC are kept in an evacuated chamber at 27ºC. The ratio of their rates of loss of heat are :
19
Nov
Two black bodies at temperatures 327ºC and 427ºC are kept in an evacuated chamber at 27ºC. The ratio of their rates of loss of heat are : Two black bodies at temperatures 327ºC and 427ºC are kept in an evacuated chamber at 27ºC. The ratio of their rates of loss of heat are : November [...]
The maximum spectral emissive power of a black body at a temperature of 5000 K is obtained as λm = 6000 Å. If the temperature is increased by 10%, then the decrease in λm will be
19
Nov
The maximum spectral emissive power of a black body at a temperature of 5000 K is obtained as λm = 6000 Å. If the temperature is increased by 10%, then the decrease in λm will be The maximum spectral emissive power of a black body at a temperature of 5000 K is obtained as λm [...]
Three stars A,B,C have surface temperatures TA,TB and TC. A appears bluish, B appears reddish and C appears yellowish. We can conclude that
19
Nov
Three stars A,B,C have surface temperatures TA,TB and TC. A appears bluish, B appears reddish and C appears yellowish. We can conclude that B B appears reddish and C appears yellowish. We can conclude that C have surface temperatures TA TB and TC. A appears bluish Three stars A November 19, 2020 Category: Chapter 16 [...]
The surface temperature of the sun which has maximum energy emission at 500 nm is 6000 K. The temperature of star which has maximum energy emission at 400 nm will be.
19
Nov
The surface temperature of the sun which has maximum energy emission at 500 nm is 6000 K. The temperature of star which has maximum energy emission at 400 nm will be. The surface temperature of the sun which has maximum energy emission at 500 nm is 6000 K. The temperature of star which has maximum [...]
The maximum energy is the thermal radiation from a hot source occurs at a wavelength of 11×10^−5cm. According to Wien’s law, the temperature of the source (on Kelvin scale) for which the wavelength at mixture energy is 5.5×10^−5 cm. The value of n is:
19
Nov
The maximum energy is the thermal radiation from a hot source occurs at a wavelength of 11×10^−5cm. According to Wien’s law, the temperature of the source (on Kelvin scale) for which the wavelength at mixture energy is 5.5×10^−5 cm. The value of n is: The maximum energy is the thermal radiation from a hot source [...]