JEE Mains Physics 2002-2019 Solved Video Solutions
A damped harmonic oscillator has a frequency of 5 oscillations per second. The amplitude drops to half its value for every 10 oscillations. The time it will take to drop to 1000/1 of the original amplitude is close to
06
Nov
A damped harmonic oscillator has a frequency of 5 oscillations per second. The amplitude drops to half its value for every 10 oscillations. The time it will take to drop to 1000/1 of the original amplitude is close to coefficient of viscosity of water =1 mPas). the Reynolds number for the flow is of the [...]
Water is flowing continuously from a tap having an internal diameter 8 x 10^−3 m. The water velocity as it leaves the tap is 0.4 m/s . The diameter of the water stream at a distance 2 x 10^−1 m below the tap is close to
06
Nov
Water is flowing continuously from a tap having an internal diameter 8 x 10^−3 m. The water velocity as it leaves the tap is 0.4 m/s . The diameter of the water stream at a distance 2 x 10^−1 m below the tap is close to coefficient of viscosity of water =1 mPas). the Reynolds [...]
If a ball of steel (density ρ=7.8g/cm^3) attains a terminal velocity of 10cm/s when falling in a tank of water (coefficient of viscosity, ηwater = 8.5×10^−4Ps s), then its terminal velocity in glycerine (ρ=12g/cm^2, η=13.2 Pas) would be nearly
06
Nov
If a ball of steel (density ρ=7.8g/cm^3) attains a terminal velocity of 10cm/s when falling in a tank of water (coefficient of viscosity, ηwater = 8.5×10^−4Ps s), then its terminal velocity in glycerine (ρ=12g/cm^2, η=13.2 Pas) would be nearly If a ball of steel (density ρ=7.8g/cm^3) attains a terminal velocity of 10cm/s when falling in [...]
A thin liquid film formed between a U-shaped wire and a light slider supports a weight of 1.5×10^−2 N (see figure). The length of the slider is 30cm and its weight negligible. The surface tension of the liquid film is
06
Nov
A thin liquid film formed between a U-shaped wire and a light slider supports a weight of 1.5×10^−2 N (see figure). The length of the slider is 30cm and its weight negligible. The surface tension of the liquid film is coefficient of viscosity of water =1 mPas). the Reynolds number for the flow is of [...]
A liquid of density p is coming out of a hose pipe of radius a with horizontal speed υ and hits a mesh . 50 % of the liquid passes through the mesh unaffected . 25 % comes back with the same speed .The resultant pressure on the mesh will be:
06
Nov
A liquid of density p is coming out of a hose pipe of radius a with horizontal speed υ and hits a mesh . 50 % of the liquid passes through the mesh unaffected . 25 % comes back with the same speed .The resultant pressure on the mesh will be: coefficient of viscosity of [...]
The top of a water tank is open to air and its water level is maintained. It is giving out 0.74 m^3 water per minute through a circular opening of 2 cm radius in its wall. The depth of the centre of the opening from the level of water in the tank is close to :
06
Nov
The top of a water tank is open to air and its water level is maintained. It is giving out 0.74 m^3 water per minute through a circular opening of 2 cm radius in its wall. The depth of the centre of the opening from the level of water in the tank is close to [...]
Water flows into a large tank with flat bottom at the rate of 10^−4 m^3s^−1. Water is also leaking out of a hole of area 1 cm^2 at its bottom. If the height of the water in the tank remains steady, then this height is :
06
Nov
Water flows into a large tank with flat bottom at the rate of 10^−4 m^3s^−1. Water is also leaking out of a hole of area 1 cm^2 at its bottom. If the height of the water in the tank remains steady, then this height is : then this height is : Water flows into a [...]
Water from a tap emerges vertically downwards with an initial speed of 1.0 ms^−1. The cross-sectional area of the tap is 10^−4 m^2. Assume that the pressure is constant throughout the stream of water and that the flow is steady. The cross-sectional area of the stream 0.15 m below the tap would be (g=10ms^−2 )
06
Nov
Water from a tap emerges vertically downwards with an initial speed of 1.0 ms^−1. The cross-sectional area of the tap is 10^−4 m^2. Assume that the pressure is constant throughout the stream of water and that the flow is steady. The cross-sectional area of the stream 0.15 m below the tap would be (g=10ms^−2 ) [...]
A cubical block of side 0.5 m floats on water with 30% of its volume under water. What is the maximum weight that can be put on the block without fully submerging it under water ? (Take density of water = 10^3 kg/m^3 )
06
Nov
A cubical block of side 0.5 m floats on water with 30% of its volume under water. What is the maximum weight that can be put on the block without fully submerging it under water ? (Take density of water = 10^3 kg/m^3 ) coefficient of viscosity of water =1 mPas). the Reynolds number for [...]
A submarine experiences a pressure of 5.05×10^6Pa at a depth of d1 in a sea When it goes further to a depth of d2. It experiences a pressure of 8.08×10^6Pa. The d2−d1 is approximately (density of water =10^3kg/m^3 and acceleration due to gravity =10 ms^−2)
06
Nov
A submarine experiences a pressure of 5.05×10^6Pa at a depth of d1 in a sea When it goes further to a depth of d2. It experiences a pressure of 8.08×10^6Pa. The d2−d1 is approximately (density of water =10^3kg/m^3 and acceleration due to gravity =10 ms^−2) coefficient of viscosity of water =1 mPas). the Reynolds number [...]