Explore topic-wise InterviewSolutions in .

A body of 10kg is kept on a table. If it is displaced by a force of 10N by 2m in horizontal line. Find work done by gravitational force.

The magnetic field strength at $1,2,$ and $3$ in the following picture is in the order:

In how much time (in seconds) should a charge of $10C$ flow between the two terminals so as to maintain a constant current of $100A$?

If a body is in motion is it necessary that it is being acted upon by a force

An aeroplane accelerates from rest down a runaway at $3m{s}^{-2}$ for $30s$ until it finally lifts off the ground. Determine the distance travelled before take off.

A fast moving truck loses momentum equal to 2 kg ms^–1 after colliding with a stationary car. Will the car lose or gain momentum? How much momentum is lost or gained by the car if the truck comes to the rest after collision? [ 2 MARKS ]

A ball is thrown vertically up from ground with initial velocity $v_0$. Its height from ground versus time graph is

A block is sliding down on an inclined plane. The velocity changes at a constant rate from $10cm/s$ to $15cm/s$ in $2$ seconds. What is its acceleration?

A microsocpe is provided with a main scale graduated with 20 divisions in 1 cm and a vernier scale with 50 divisions of main scale. Find the least count of the microscope.

Describe in brief, with the aid of a labelled diagram, an experiment to demonstrate that a material medium is necessary for the propagation of sound.

Without the presence of greenhouse gases in the atmosphere, the earth's average surface temperature would be ______ ${}^{\circ }\text{C}$.

What will be the daughter nuclei after 4 alpha decays of ${}_{91}^{231}Pa$?

In a pond, the pressure at the surface at point A is P${}_1$ and at another point B, which is h meter below A is P ${}_2$. Which of the following statements holds true?

Give two examples to show that greater the mass, greater is the inertia of the body.

Name the device used by doctors to listen to our heartbeats.

How much time does the bob of a seconds' pendulum take to move from one extreme of its oscillation to the other extreme ?

A scoters is moving with velocity 25 m/ sec and takes 5 sec to stop after brake is applied . If mass of scotter along with rider is 180 kg find change in momentum.

During a jump from the aeroplane at a particular velocity, the air drag on parachute becomes

An electric train is moving with a velocity of 120km/hr. how much distance will it cover in 30
sec?

Atmospheric pressure at a place is 650 my of Hg. Calculate the pressure in pascals. Density of Hg = 13600 kg/m3, g = 10

The distance traveled by a body in the nth second is given by 2+3n. Find the initial velocity and acceleration. Also, find its velocity at the end of 2 seconds.(please show the comparison of equations)

Identify the symbol used to represent Avogadro's number.

Dear sir/ma'am,

I was watching a video of chapter Force and Laws of Motion, in that chapter there was a video (Engine Problem one video) in that video question was the same as my ncert science textbook (question no. 7 of the book). The question was as follows,

A 8000 Kg engine pulls a train of 5 wagons, each of 2000 Kg, along a horizontal track. If the engine exerts a force of 40000 N and the track offers a friction force of 5000 N, then calculate :

A. the net accelerating force;

B.the acceleration of the train ; and

C. the force of wagon 1non wagon 2.

So, my droughts are that

1.In the video he did find the acceleration of the train(3.5 m/s²)but he excluded the mass of the train, and when I find the acceleration of the train including the mass of the train my answer was same as in the book(1.944 m/s²) So, why did he excluded the mass of train?

2.The third part of the question was to find the force of wagon 1 on wagon 2, he did find that also but in the book answer is different (15556).Why?

Can I get a solution of this question? (all the parts)

Suppose that a box is accelerating at a rate of $2\frac{m}{s^2}$. If the net force is tripled and the mass is doubled, then what is the new acceleration of the box?

___$\frac{m}{s^2}$.

Which of the following is the correct expression for increase in length of a wire in terms of its original length and rise in its temperature?.

Find the recoil velocity of a gun having a mass equal to 5 kg, if a bullet of 25 g acquires the velocity of 500 m/s after firing from the gun.

A cannon of mass 1000 kg can fire a bolt of 20 kg with a muzzle velocity of $300\frac{m}{s}$. If the cannon is free to move, the backwards velocity of the cannon after the bolt is fired will be:

In which of the following cases of motion, the distance moved and the magnitude of displacement are equal ?

(a) If the car is moving on straight road

(b) if the car is moving on circular road

(c) if the pendulum is moving to and fro

(d) if a planet is moving around the sun

Complete the following sentences :
(a) Two balls, one of iron and the other of aluminium experience the same upthrust when dipped completely in water if ___

(b) An empty tin container with its mouth closed has an average density equal to that of a liquid. The container is taken 2 m below the surface of that liquid and is left there. Then the container will ___
(c) A piece of wood is held under water. The upthrust on it will be ___ the weight of the wood piece.

Aryan was riding a bicycle on moon. His initial velocity was 50 m/s and he changed his velocity to 70m/s in 20s. If the gravity on moon is 1.63 ms² . Find the distance travelled by him

Q- A car travels along a straight line and covers 1/3 of the total distance, with a speed of 4m/s. The remaining distance it covers with a speed of 2m/s half the time and with a speed of 6m/s in the remaining half time.

A bullet of mass 20 gram of horizontally fired with a velocity of 150 M per second from a pistol of mass 2 kg . what is the recoil velocity of the pistol

Is amplitude a scalar or vector physical quantity?(sound wave).Also mention the reason for what type of quantity it is.

Identify the figure of speech in the sentence.

Uneasy lies the head that wears a crown.

The energy production in stars is due to

The area enclosed by velocity-time graph and the time axis will be equal to the magnitude of

Explain why, a ray of light passing through the centre of curvature of a concave mirror gets reflected back along the same path.

A weighing bar with 75 kg mass is lifted to a height of 1.5 m by a weight lifter. What would be the potential energy of weight bars at highest position if lifter holds it for 5 seconds?

A bullet is fired into a wall with a velocity of 50 M per second. If the Bullet stops at the depth of 10 cm inside the wall find find the retardation provided by the wall

The tendency of a liquid in a tube or absorbent material to rise or fall as a result of surface tension is called

The slope of a speed-time graph gives :

(a) distance travelled

(b) velocity

(c) acceleration

(d) displacement

A CD accelerates uniformly from rest to 200 spins per minute in 8 seconds. If the rate of change of speed is constant, determine the instantaneous acceleration in rad/s².

A tall vertical cylinder filled with water is kept on a horizontal table top. Two small holes A and B are made on the wall of the cylinder, A near the middle and B just below the free surface of water. State and explain your observation.

State two factors on which the speed of a wave travelling in a medium depends.

Does the centre of mass of a body necessarily lie inside the body ?

Mahesh performed 10 J of work in 10 seconds. Vijay performed 5 J of work in 2 seconds. Who generated greater power?