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Which of the following devices use electromagnets?

Which of the following will have the largest inertia?

If the length of a closed organ pipe is 1m and velocity of sound is 330 m/s,

then the frequency for the second note is

A body travels 200 cm in the first two seconds and 220 cm in the next four seconds. The velocity at the end of seventh second from start is

A particle moves $3m$ north, then $4m$ east and finally $6m$ south. Which of the following is correct about the distance travelled and the displacement?

Which of the following measures a small length to a high accuracy : metre rule, vernier callipers, screw gauge ?

If the mass of the block is 2 kg, then the values of T is :

Show that if mass of two bodies are equal their weights will be same in whichever part of universe it may be measured.

If the angle of incidence is zero degrees, what is the angle of reflection?

Consider 2 mirrors arranged at right angle as shown. A ray is incident at an angle of ${30}^{\circ }$ to the normal of the mirror 1.
What is the angle made by the outgoing ray with the normal of mirror 2?

Which object has more inertia and why? A car or a ship?

A hydrometer is based on

Ted checked out the Odometer of his car. The reading was 1111.22 km. At the end of his journey, the reading was 1342.56 km. How many meters did Ted travel?

Define work.

A boy uses a vernier callipers to measure the thickness of his pencil. He measures it to be 1.4 mm. If the zero error of vernier callipers is + 0.02 cm, what is the correct thickness of pencil ?

When a train suddenly starts moving forward, the passenger standing in the compartment tends to fall back is an example of inertia of ___ .

Is it possible to displace the earth position from its orbit to any another planet's orbit?

I move my hand upwards. Can we call it motion?

Three different objects of masses $m_1,m_{2}and{m}_3$ are made to fall from rest along three frictionless paths, from the same height. What is the ratio of their speeds to reach the ground?

If an apple is taken to mountain top why does its weight decreases?

A man standing on the edge of a cliff at some height above the ground throws ball 1 straight up with intial speed u and then throws ball 2 straight down with the same intial speed then what happens

Shell of mass 10kg is fired from a gun of mass 600 kg the gun recoils with a velocity of 6 m per second find the muzzle velocity of the shell

By what temperature a rod should be heated so that it's length becomes $2l_0$ if initial length is $l_0$ . Assume that $alpha$ (coefficient of linear expansion) in that range of temperature remains constant and melting point is very high.

The weight of a person of mass $60kg$ as measured by a weighing balance is in freely falling lift.

A child drops a toy from the top of a building, it takes $1s$ to reach the ground. Find the height of the building and the average speed of the toy respectively? (Take $g=10m{s}^{-2}$)

How does Newton's second law of motion differ from first law o motion?

A man pushes a truck initially at rest and weighing 4 tones along a horizontal rail with steady force of 200 N. The resistance to motion amounts to 30 N per tone. Find the velocity of truck at the end of 10 seconds.

Calculate the work done (in KJ) required stopping a 1500 kg car, moving at the velocity of 90 km/hr.

A massless spring of force constant 1000 N/m is compressed a distance of 20cm between discs of 8kg and 2kg, spring is not attached to discs. The system is given an initial velocity 3m/s perpendicular to length of spring as shown in figure. What is ground frame speed of 2 kg block (in m/s) when spring regains its natural length.

The velocity - time graph of a body with a constant acceleration is:

u – object distance

v – image distance

f – focal length

R – radius of curvature

Choose the option which shows correct sign convention?

A non-zero force is acting on a body but work done is zero. Which of the following statement(s) justify the above situation?

An empty truck with a mass of 2500 kg has an engine that will accelerate at a rate of 1.5 m/s². What will be the acceleration when the truck has an additional load of 1500 kg? (in m/s²)

A train starting from rest attains a velocity of 72 km/h in 5 minutes. Assuming that the acceleration is uniform, find the acceleration and the distance travelled by train for attaining this velocity.

Time-velocity graph of a body is shown in the fig. Find its acceleration in m/s².

The potential difference required to pass a current of 0.2 A through a wire of resistance 20 $\Omega$ is:

Which of the following pairs of angle will be equal in the given figure. Given ∠2 = ${30}^{\circ }$

Define gravitational mass. The mass of the earth is $6\times {10}^{24}kg$ and that of the moon is $7.4\times {10}^{22}kg$. If the distance between the earth and the moon be $3.84\times {10}^{5}km$, calculate the force exerted by the earth on the moon. $(G=6.7\times {10}^{-11}N{m}^{2}k{g}^{-2})$
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If a car at rest accelerate uniformly and attains a speed of 54km/h in 10 sec it covers a distance of ________ ?

Why does motorcar truck have much wider tyres

What is bouyancy?

How to find acceleration if the object is not moving in a straight line ?

The question is from force and pressure.

In a game of cricket, the 'bails' fall when the ball strikes them. This is an example of a/an ________ force.

Pls. explain