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Vapour density of a gas is 22. What is its inter molecular space ?

Difference between odometer and speedometer.

Which of the following instrument has the least count of 0.01 mm in general.

Rashi soaked her table cloth in the mixture of alcohol and water, on exposure to heat quickly catches fire which gets extinguished after a short while without burning the cloth. Why is it so?

Which figure has ${\frac{1}{3}}^{rd}$ of its whole shaded?

A $1000kg$ car moving at a speed of $20m{s}^{-1}$ is brought to rest in a distance of $50m$, calculate the net force acting on the car.

A bullet of $5$ g is fired from a pistol of $1.5$ kg. If the recoil velocity of pistol is $1.5$ $\frac{m}{s}$. What is the final momentum of the pistol?

From a rifle of mass 4kg, a bullet of mass 50g is fired with a initial velocity of 20m/s.Calculate initali velocity of the rifle?

A bullet of mass 20g is horizontally fired with a horizontal velocity 150m/s from a pistol of mass 2kg. What is the recoil velocity of the pistol?

By taking mass of pistol 0.020g.

Sir can we make a small machine with is a plane surface like machine on which if we stand we could fly so I want to make a machine which can do gravity 0 on its surface pls tell me than watch would I need to make such type of machine

In the above problem, if we consider the two masses to be a system, the tension is an external force.

If 20 waves are produced per second, what is the frequency in hertz?

Which of the following electric cells is a primary cell?

A body starts from rest and requires a velocity $10m{s}^{-1}$ in 2s.Find the acceleration.

Why it is advised to tie the luggage with a rope on the roof of the buses ?

Why does nose start bleeding on high mountains ?

How will the resistance be affected if the various parameters are changed as follows?
$\begin{array}{cc}\text{i) Length increases}& \text{x) Resistance increases}\\ \text{ii) Area increases}& \text{y) Resistance decreases}\\ \text{iii) Resistivity decreases}& \text{z) Resistance remains the same}\\ \text{iv) Temperature increases}& \\ \text{v) Velocity increases}& \end{array}$

Calculate the work done in lifting 200kg of water through a vertical height 6meters

On a horizontal frictional frozon lake , a girl(36 kg) and box (9kg) are connected to each other by means of a rope. Initally they are 20 m apart . The girl exerts a horizontal force on the box ,pulling it towards her . How far has the girl travelled when she meet the box ?

A parachutist falls freely from the plane for first 10 seconds.Then it decelerates at a rate of 2.5m/s^2 .If he bails out of the plain from a height of 2495m then what is the velocity on reaching the ground.a=10

Mass of the bullet is $m_1$ and mass of gun is $m_2$. System is initially at rest. Now the bullet fired with velocity $V_1$ with respect to gun. What will be the distance between gun and bullet after time t?

What is the name of the strings which vibrate in our voice box when we talk ?

Question 1
The atmosphere of the earth is heated by radiations which are mainly:

(a) radiated by the sun
(b) re-radiated by land
(c) re-radiated by water
(d) re-radiated by land and water

In a team of 11 players, there are 7 batsmen and 6 bowlers. Find the number of players who can do both bowling and batting.

Young children below 5 year can hear up to a frequency of

A car moves linearly with uniform retardation. If the car covers 40m in the last 2 seconds of its motion, what is the velocity of the car at the beginning of the last second

Why there are no green coloured stars in the universe?

A particle is moving in a straight line with initial velocity of 10 $\frac{m}{s}$. Acceleration - Time graph of the particle is shown in the figure. Find velocity at t = 10 seconds.

A car is moving with a uniform velocity of 10m/s .the driver of the car decides to overtake the bus moving ahead of the car.so the driver of the car accelerates at 1m/s^{​​​​2} for 10 sec . Find the velocity of the car at the end of 10 sec.also find the distance travelled by the car while accelerating.

An object is dropped from rest at a height of 150m and simultaneously, another object is dropped from a height of 100m from rest. What is the difference in their height after 2 seconds if both the objects drop from the same acceleration. How does the difference in heights vary in time?

can we consider applying force as motion?

A particle is released from a height h. At a certain height its kinetic energy is two-fifth of its potential energy, the speed of the particle at that instant is

The speed-time graph for a particle moving at constant speed is a straight-line ________ to

the time axis.

A bullet of $25\text{g}$ acquires the velocity of $500{\text{m s}}^{-1}$ after firing from the gun. Find the recoil velocity of a gun having a mass equal to $5\text{kg}$.

A charge of $420C$ flows through a conducting wire in 5 minutes. Find current flowing through the conductor.

The graph shows the car’s speed plotted against time.
How far does the car travel before it reaches a constant speed?

It is found that for a screw gauge, the $5^{th}$​ division of the head scale coincides with the pitch scale axis and the zero of the head scale lie below the pitch scale axis. The least count of the screw gauge is 0.01 mm. What is the zero correction?

Which word does NOT belong with the others?

A physicist is investigating the effect that different conditions have on the force of friction. The material used is an ordinary brick, with a mass of 1.8 kg. It is pulled across the surface of a wooden table. Friction is measured by pulling the brick with a string attached to a spring scale, calibrated in newtons (N). When the brick is pulled at constant speed, the reading on the scale is equal to the force of friction between the brick and the table top.
Experiment 1: The brick is placed on the table in three different positions. First, it is allowed to rest on its broad face (area $=180c{m}^2$), then on its side (area $=130c{m}^2$), and finally on its end (area $=56c{m}^2$)
Table 1
$\begin{array}{cccc}Area\left(c{m}^2\right)& 180& 130& 56\\ Friction\left(N\right)& 7.1& 7.3& 7.2\end{array}$

Experiment 2: A wooden block of mass 0.6 kg is made to the same dimensions as the brick, and the experiment is repeated.
Table 2
$\begin{array}{cccc}Area\left(c{m}^2\right)& 180& 130& 56\\ Friction\left(N\right)& 1.2& 1.1& 1.2\end{array}$

Experiment 3: The time, the wooden block is loaded by adding 1.2 kg of extra mass on top of it, to give it the same weight as the brick.
Table 3
$\begin{array}{cccc}Area\left(c{m}^2\right)& 180& 130& 56\\ Friction\left(N\right)& 3.5& 3.6& 3.7\end{array}$
From Experiment 1, it would be reasonable to hypothesize that:

Four cylindrical rods of different radii and lengths are used to connect two heat reservoirs at fixed temperatures t₁ and t₂ respectively. From the following pick out the rod which will conduct the maximum quantity of heat:

An inclined plane is of length 8m & its vertical height is 4m. Calculate the effort required for a load of 200kgf if the plane is ideal. g = 10m/s²

A boy can jump 2 m on the surface of earth. How much can he jump on the surface of moon assuming that g on moon is 1/5 that of earth.