Physics-

General

Easy

Question

# An intense stream of water of cross-sectional area strikes a wall at an angle with the normal to the wall and returns back elastically. If the density of water is and its velocity is ,then the force exerted in the wall will be

## The correct answer is:

### Linear momentum of water striking per second to the wall , similarly linear momentum of reflected water per second

Now making components of momentum along - axes and -axes. Change in momentum of water per second

By definition of force, force exerted on the Wall

### Related Questions to study

physics-

### The force required to stretch a spring varies with the distance as shown in the figure. If the experiment is performed with above spring of half length, the line will

### The force required to stretch a spring varies with the distance as shown in the figure. If the experiment is performed with above spring of half length, the line will

physics-General

physics-

### Two small particles of equal masses start moving in opposite directions from a point in a horizontal circular orbit. Their tangential velocities are and , respectively, as shown in the figure. Between collisions, the particles move with constant speeds. After making how many elastic collisions, other than that at , these two particles will again reach the point

### Two small particles of equal masses start moving in opposite directions from a point in a horizontal circular orbit. Their tangential velocities are and , respectively, as shown in the figure. Between collisions, the particles move with constant speeds. After making how many elastic collisions, other than that at , these two particles will again reach the point

physics-General

maths-

### In a model, it is shown that an arch of abridge is semi-elliptical with major axis horizontal. If the length of the base is 9 m and the highest part of the bridge is 3 m from the horizontal, the best approximation of the height of the arch, 2 m from the centre of the base is

### In a model, it is shown that an arch of abridge is semi-elliptical with major axis horizontal. If the length of the base is 9 m and the highest part of the bridge is 3 m from the horizontal, the best approximation of the height of the arch, 2 m from the centre of the base is

maths-General

maths-

### The number of non-negative integral solutions of x + y + z n, where n N is -

### The number of non-negative integral solutions of x + y + z n, where n N is -

maths-General

maths-

### Between two junction stations A and B there are 12 intermediate stations. The number of ways in which a train can be made to stop at 4 of these stations so that no two of these halting stations are consecutive is -

### Between two junction stations A and B there are 12 intermediate stations. The number of ways in which a train can be made to stop at 4 of these stations so that no two of these halting stations are consecutive is -

maths-General

maths-

### If n objects are arranged in a row, then the number of ways of selecting three of these objects so that no two of them are next to each other is -

### If n objects are arranged in a row, then the number of ways of selecting three of these objects so that no two of them are next to each other is -

maths-General

Maths-

### The number of numbers between 1 and 10^{10} which contain the digit 1 is -

### The number of numbers between 1 and 10^{10} which contain the digit 1 is -

Maths-General

Maths-

### The number of rectangles in the adjoining figure is –

### The number of rectangles in the adjoining figure is –

Maths-General

chemistry-

### Assertion :this equilibrium favours backward direction.

Reason :is stronger base than

### Assertion :this equilibrium favours backward direction.

Reason :is stronger base than

chemistry-General

Physics-

### A 0.098 kg block slides down a frictionless track as shown. The vertical component of the velocity of block at is

### A 0.098 kg block slides down a frictionless track as shown. The vertical component of the velocity of block at is

Physics-General

physics-

### Two small particles of equal masses start moving in opposite directions from a point A in a horizontal circular orbit. Their tangential velocities are respectively, as shown in the figure. Between collisions, the particles move with constant speeds. After making how many elastic collisions, other than that at ,these two particles will again reach The point

### Two small particles of equal masses start moving in opposite directions from a point A in a horizontal circular orbit. Their tangential velocities are respectively, as shown in the figure. Between collisions, the particles move with constant speeds. After making how many elastic collisions, other than that at ,these two particles will again reach The point

physics-General

physics-

### The trajectory of a particle moving in vast maidan is as shown in the figure. The coordinates of a position are The coordinates of another point at which the instantaneous velocity is same as the average velocity between the points are

### The trajectory of a particle moving in vast maidan is as shown in the figure. The coordinates of a position are The coordinates of another point at which the instantaneous velocity is same as the average velocity between the points are

physics-General

physics-

### The potential energy of a particle varies with distance as shown in the graph.

The force acting on the particle is zero at

### The potential energy of a particle varies with distance as shown in the graph.

The force acting on the particle is zero at

physics-General

physics-

### A mass moves along -axis. Its acceleration as a function of its position is shown in the figure. What is the total work done on the mass by the force as the mass moves from to

### A mass moves along -axis. Its acceleration as a function of its position is shown in the figure. What is the total work done on the mass by the force as the mass moves from to

physics-General

physics-

### A mass slips along the wall of a semispherical surface of radius . The velocity at the bottom of the surface is

### A mass slips along the wall of a semispherical surface of radius . The velocity at the bottom of the surface is

physics-General