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A body starts from rest and is uniformly accelerated for 30s. The distance travelled in the first 10s is $x_1$, next 10s is $x_2$ and last 10s is $x_3$. Then $x_1$:$x_2$:$x_3$ is the same as

A sound wave having a wavelength of 20 cm is travelling in water. If the velocity of sound in water is $1600m{s}^{-1}$, then find the frequency of the sound wave.

When no current is drawn from a cell, the potential difference between the terminals of the cell is called

A body of mass $2.5kg$ is thrown vertically upwards from the ground level. It reaches a maximum height of $100m$ in $10seconds$. Find the power required to throw the ball in the above case.$(Takeg=10m{s}^{-2})$

A man is kidnapped, blindfolded and imprisoned in a big room. How could the man tell if he was in :

(a) a city

(b) a village

(c) a bare room

(d) a furnished room ?

The gravitational force between two objects is F. If both of their masses are halved without altering the distance between the objects, the new F would be

If an object moves 5 $\frac{m}{sec}$ towards the mirror. And the mirror also moves 5 $\frac{m}{sec}$ towards the object. Then find out velocity by which image will move?

How is the resistance of a wire affected if its radius is doubled

The sun appears to move ___ among the stars.

Two masses ${\text{m}}_1$ and ${\text{m}}_2$ collide with each other. Before the collision, the velocities are ${\text{u}}_1$ and ${\text{u}}_2$ respectively. After the collision, the velocities are ${\text{v}}_1$ and ${\text{v}}_2$ respectively. The total final momentum after collision is given by:

A particle moves in a circle of radius 2 m and completes 5 revolutions in 10 seconds. Calculate its angular velocity and linear velocity. [3 MARKS]

If the work done by a force in moving an object through a distance of 20 cm is 24.2 J, what is the magnitude of the force ?

What name is given to the repetition of sound caused by the reflection of sound waves ?

The audible range of sound that humans can hear is:

State whether the following statements are true or false :
(a) The buoyant force depends on the nature of object immersed in the liquid.
(b) Archimedes' principle can also be applied to gases.

If i am sitting without doing anything, will i have potential energy in me? We will requore energy to do work. So what is that energy called that you use before producing kinetic energy? Will i have kinetic energy of i apply any kind of force (muscular, gravitational and so on)

Name two factors on which the time period of a simple pendulum does not depend.

State the general name of the waves in which the particles of the medium vibrate :

(i) in the same direction as wave.

(ii) at right angles to the direction of wave.

From a waterfall, water is falling at the rate of 100 kg/s on the blades of a turbine. If the height of fall is 100 m, the power delivered to the turbine is

When is work done equal to kinetic energy and when is it equal to potential energy?

For an object to have gravitational potential energy only, it must be

A circuit contains two unequal resistances in parallel.

Is the sun moving or not? Solutio should have a video to understand better.

(a) What do you understand by the kinetic energy of a body ?

(b) A body is thrown vertically upwards. Its velocity goes on decreasing. What happens to its kinetic energy as its velocity becomes zero ?

(c) A horse and a dog are running with the same speed. If the weight of the horse is ten times that of the dog, what is the ratio of their kinetic energies ?

What name is given to the sound waves of frequency too low for humans to hear ?

Explain how flaws (or defects) in a metal block can be detected by using ultrasound.

Ram and Shyam are climbing a tree to same height. Ram weighs $\text{50kg}$ and Shyam weighs $\text{60kg}$. Power expended by Ram and Shyam to climb the tree are in the ratio of $\text{3:2}$. What is the ratio of time taken by Ram and Shyam to climb the tree?

A football of mass 5 kg moving with a velocity of 10 m/s hits a pole and, the ball bounces back with a velocity of 5m/s. Find the change in momentum and the force exerted on the ball, if the force acts for 0.02s.

Shubham has to send a laser signal to Aman. But he finds out that the signal misses Aman by $4^0$. He asks Himanshu to rotate the mirror.

By what angle should Himanshu rotate the mirror so that the signal reaches Aman?

An object of mass $5kg$ moves with an acceleration of $3m{s}^{-2}$ when a force is applied on it. What is the force that is applied on the object?

Can force be negative or is it always positive??

What is the cause of resistance in wires?

A force acts for 10s on a stationary object of mass 100kg after which the forces cease to act. The body moves through a distance of 100m in the next 5s. Calculate

1 the velocity attained by the body

2 the acceleration produced by the force

3 the magnitude of the force

What is magnetic field line and what are it's properties?

If a liquid is placed in a vertical cylindrical vessel and the vessel is rotated about its axis, the liquid will take the shape of figure

In parallel combination, the equivalent resistance:

Two rods of different materials having coefficients of thermal expansion ${\alpha }_1$ and ${\alpha }_2$ and Young's modulii $Y_1$ and $Y_2$ are fixed between two rigid and massive walls. The rods are heated to the same temperature. If there is no bending of the rods, the thermal stresses developed in them are equal provided

Two identical bullets are fired and by a light rifle and another by a heavy rifle with the same force .which rifle will the shoulder more and why?

It is said that Mass does not interfere(has no role) on the free fall of a particle but we know if force is constant then acceleration is inversely proportional to mass hence more the mass more the acceleration..... This is contradicting plz clear it.

A car traveled a distance of $100km$ in $2hours$. Find the average speed of the car.