in a lake ,a fish rising vertically to the surface of water uniformly at th rate of 3 m/s ,observe a bird diving vertically towards the water at a rate of 9 m/s vertically above it .calculate actual velocity of the dive of the bird.

Question

Abhishek Singh · Answer

Velocity of bird with respect to stationary fish in water = 6m/s So actual vel of bird = 6/refractive index of water =4.5

Kushagra Madhukar · Answer

Dear student, Please find the attached solution to your problem. Speed of fish, V f = 3 m/s Speed of bird w.r.t fish, V bf = – 9 m/s (Since it is in opposite direction) Now, V bf = V b – V f Hence, V b = V bf + V f = – 9 + 3 = – 6 m/s (vertically downward direction) If we consider the refractive index of water, n = 4/3 Let, the actual velocity of bird in air be V B The velocity of bird for the stationary fish inside water = V b = nV B Hence, V B = V b /n = 6 x ¾ = 4.5 m/s Hope it helps. Thanks and regards, Kushagra

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in a lake ,a fish rising vertically to the surface of water uniformly at th rate of 3 m/s ,observe a bird diving vertically towards the water at a rate of 9 m/s vertically above it .calculate actual velocity of the dive of the bird.

in a lake ,a fish rising vertically to the surface of water uniformly at th rate of 3 m/s ,observe a bird diving vertically towards the water at a rate of 9 m/s vertically above it .calculate actual velocity of the dive of the bird.

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in a lake ,a fish rising vertically to the surface of water uniformly at th rate of 3 m/s ,observe a bird diving vertically towards the water at a rate of 9 m/s vertically above it .calculate actual velocity of the dive of the bird.

in a lake ,a fish rising vertically to the surface of water uniformly at th rate of 3 m/s ,observe a bird diving vertically towards the water at a rate of 9 m/s vertically above it .calculate actual velocity of the dive of the bird.

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