Physics-
General
Easy

Question

A boy having a mass of M kg stands at one end A of a boat of length dm at rest. The boy walks to the other end B of the boat with a velocity u relative to the boat. What is the velocity of the boat? Friction exists between the feet of the boy and the surface of the boat. But the friction between the boat and the water surface may be neglected. Mass of the boat is 4 m

  1. u    
  2. fraction numerator 4 u over denominator 5 end fraction    
  3. fraction numerator u over denominator 5 end fraction    
  4. fraction numerator 2 u over denominator 5 end fraction    

The correct answer is: fraction numerator u over denominator 5 end fraction

Related Questions to study

General
physics-

A equilateral triangular, square and circular plates of same thickness and made up of different materials are arranged is shown in figure.
The ratio of their respective densities are 3 left parenthesis 8 plus pi right parenthesis colon 6 colon 1. The centre of mass of the arrangement lies

A equilateral triangular, square and circular plates of same thickness and made up of different materials are arranged is shown in figure.
The ratio of their respective densities are 3 left parenthesis 8 plus pi right parenthesis colon 6 colon 1. The centre of mass of the arrangement lies

physics-General
General
physics-

The centre of mass of a triangular lamina of uniform density of height h is

The centre of mass of a triangular lamina of uniform density of height h is

physics-General
General
physics-

A semi-circular plate of radius R has density rho equals rho subscript 0 end subscript r, where r is the distance from centre. The position of centre of mass from 0 is

A semi-circular plate of radius R has density rho equals rho subscript 0 end subscript r, where r is the distance from centre. The position of centre of mass from 0 is

physics-General
parallel
General
physics-

A semi-circular plate with cavity having inner radius R and outer radius 2R with uniform density is a shown. The centre of mass of the thin plate is at

A semi-circular plate with cavity having inner radius R and outer radius 2R with uniform density is a shown. The centre of mass of the thin plate is at

physics-General
General
physics-

A rod AB of length 10 cm, has its mass per unit length varying from 1 kg/m cat end A ) to 2Kg/m ( at end B). The distance of centre of mass from end B is :

A rod AB of length 10 cm, has its mass per unit length varying from 1 kg/m cat end A ) to 2Kg/m ( at end B). The distance of centre of mass from end B is :

physics-General
General
physics-

If a square of side R/2 is removed from a uniform circular disc of radius R as shown in the figure, the shift in centre of mass is

If a square of side R/2 is removed from a uniform circular disc of radius R as shown in the figure, the shift in centre of mass is

physics-General
parallel
General
physics-

If a triangular sheet is removed from one edge of a uniform rectangular sheet as shown in the figure, then the shift in the centre of mass of the system is

If a triangular sheet is removed from one edge of a uniform rectangular sheet as shown in the figure, then the shift in the centre of mass of the system is

physics-General
General
physics-

The co-ordinates of centre of mass of letter E which is cut from a uniform metal sheet are (Take origin at bottom left corner and width of letter 2 cm every where)

The co-ordinates of centre of mass of letter E which is cut from a uniform metal sheet are (Take origin at bottom left corner and width of letter 2 cm every where)

physics-General
General
physics-

Two blocks of equal mass are tied with a light string which passes over a massless pulley as shown in figure. The magnitude of acceleration of centre of mass of both the blocks is (neglect friction everywhere)

Two blocks of equal mass are tied with a light string which passes over a massless pulley as shown in figure. The magnitude of acceleration of centre of mass of both the blocks is (neglect friction everywhere)

physics-General
parallel
General
physics-

The centre of mass coordinates of a block of shape shown in fig. is

The centre of mass coordinates of a block of shape shown in fig. is

physics-General
General
physics-

Seven homogeneous blocks each of length L are arranged as shown in th figure. Each block is displaced with respect to the one in contact by L/10. The x-coordinate of the centre of mass of the system relative to the origin O is

Seven homogeneous blocks each of length L are arranged as shown in th figure. Each block is displaced with respect to the one in contact by L/10. The x-coordinate of the centre of mass of the system relative to the origin O is

physics-General
General
physics-

A rod consists of two parts made up of a homogeneous material with square type cross - section as shown. The position of C.M from the end ' O ' is

A rod consists of two parts made up of a homogeneous material with square type cross - section as shown. The position of C.M from the end ' O ' is

physics-General
parallel
General
physics-

Three identical rods each of length L and mass m are joined to form a U-shape as shown in figure. The distance of centre of mass of the combined system from the corner ' O ' is

Three identical rods each of length L and mass m are joined to form a U-shape as shown in figure. The distance of centre of mass of the combined system from the corner ' O ' is

physics-General
General
physics-

The co-ordinates of the centre of mass of the system as shown in figure are

The co-ordinates of the centre of mass of the system as shown in figure are

physics-General
General
physics-

A thin uniform rod of length L is bent at its mid point as shown in the figure. The distance of centre of mass form the point ' O ' is

A thin uniform rod of length L is bent at its mid point as shown in the figure. The distance of centre of mass form the point ' O ' is

physics-General
parallel

card img

With Turito Academy.

card img

With Turito Foundation.

card img

Get an Expert Advice From Turito.

Turito Academy

card img

With Turito Academy.

Test Prep

card img

With Turito Foundation.