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A solid sphere of mass M and radius a is surrounded by a uniform concentric spherical shell of thickness 2a and mass 2M. The gravitational field at distance 3a from the centre will be:
19
Sep
A solid sphere of mass M and radius a is surrounded by a uniform concentric spherical shell of thickness 2a and mass 2M. The gravitational field at distance 3a from the centre will be: A solid sphere of mass M and radius a is surrounded by a uniform concentric spherical shell of thickness 2a and [...]
A rocket has to be launched from earth in such a way that it never returns. If E is the minimum energy delivered by the rocket launcher, what should be the minimum energy that the launcher should have if the same rocket is to be launched from the surface of the moon ? Assume that the density of the earth and the moon are equal and that the earth’s volume is 64 times the volume of the moon :
19
Sep
A rocket has to be launched from earth in such a way that it never returns. If E is the minimum energy delivered by the rocket launcher, what should be the minimum energy that the launcher should have if the same rocket is to be launched from the surface of the moon ? Assume that [...]
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A rocket has to be launched from earth in such a way that it never returns. If E is the minimum energy delivered by the rocket launcher ,
A source of sound is approaching an observer with speed of 30ms and the observer is approaching the source with a speed 60 ms". Then the fractional change in the frequency of sound in air (330ms) is ,
Four identical particles of mass M are located at the corners of a square of side a . What should be their speed if each of them revolves under the influence of other’s gravitational field in a circular orbit circumscribing the square?
19
Sep
Four identical particles of mass M are located at the corners of a square of side a . What should be their speed if each of them revolves under the influence of other’s gravitational field in a circular orbit circumscribing the square? A source of sound is approaching an observer with speed of 30ms and [...]
A wave frequency 400 hz has a wave velocity of 300m/s. The phase difference between two displacement at certain point at time t=10^-3 s apart is
19
Sep
A wave frequency 400 hz has a wave velocity of 300m/s. The phase difference between two displacement at certain point at time t=10^-3 s apart is A wave frequency 400 hz has a wave velocity of 300m/s. The phase difference between two displacement at certain point at time t=10^-3 s apart is September 19, 2020 [...]
Two cars are moving on two perpendicular roads towards a crossing with uniform speeds of 72 km/h and 36 km/h. If first car blows horn. of frequency 280 Hz, then the frequency of horn. heard by the driver of second car when line joining the car makes angle of 45 with the roads, will be
19
Sep
Two cars are moving on two perpendicular roads towards a crossing with uniform speeds of 72 km/h and 36 km/h. If first car blows horn. of frequency 280 Hz, then the frequency of horn. heard by the driver of second car when line joining the car makes angle of 45 with the roads, will be [...]
Two tuning forks A and B having a frequency of 500 Hz each are placed with B to the right of A. An observer in between the forks in moving towards B with a speed of 25 m/s. The speed of sound is 345 m/s and the wind speed is 5 m/s from A to B. Calculate the difference in the two frequencies heard by observer.
19
Sep
Two tuning forks A and B having a frequency of 500 Hz each are placed with B to the right of A. An observer in between the forks in moving towards B with a speed of 25 m/s. The speed of sound is 345 m/s and the wind speed is 5 m/s from A to [...]
A large number of bullets are fired in all directions with same speed u. What is the maximum area on the ground on which these bullets will spread?
19
Sep
A large number of bullets are fired in all directions with same speed u. What is the maximum area on the ground on which these bullets will spread? A large number of bullets are fired in all directions with same speed u. What is the maximum area on the ground on which these bullets will [...]
A projectile is thrown into space so as to have maximum horizontal range R. Taking the point of projection as origin, find out the co-ordinates of the point where the speed of the particle is minimum.
19
Sep
A projectile is thrown into space so as to have maximum horizontal range R. Taking the point of projection as origin, find out the co-ordinates of the point where the speed of the particle is minimum. A projectile is thrown into space so as to have maximum horizontal range R. Taking the point of projection [...]
A source of sound is approaching an observer with speed of 30ms and the observer is approaching the source with a speed 60 ms”. Then the fractional change in the frequency of sound in air (330ms) is
19
Sep
A source of sound is approaching an observer with speed of 30ms and the observer is approaching the source with a speed 60 ms”. Then the fractional change in the frequency of sound in air (330ms) is A source of sound is approaching an observer with speed of 30ms and the observer is approaching the [...]
Figure 5.18 shows four paths for a kicked football. Ignoring the effects of air on the flight, rank the paths according to the initial horizontal velocity component, highest first.
19
Sep
Figure 5.18 shows four paths for a kicked football. Ignoring the effects of air on the flight, rank the paths according to the initial horizontal velocity component, highest first. Figure 5.18 shows four paths for a kicked football. Ignoring the effects of air on the flight highest first. rank the paths according to the initial [...]