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Why don't planets stop revolution and if the will stop what will happen to them ? And how do they revol continuesly? And plantes revol In eliptical shape so why we say them in circular motion ?

A person standing in a bus falls backward when bus suddenly starts moving in forward direction. This happens due to

The physical quantity whose unit is coulomb per second is ___.

Find the time taken by a body of mass 16 kg to come to rest from a uniform velocity of magnitude 10 m/s, when a force of 4N is applied continuously on it.

What are the two kinds of mechanical energy ?

A cat runs around the boundary of a square field of side 6m in 10s. The displacement of the cat in 1 minute is

A $60m$ long train moving on a straight level track passes a pole in $5s,$ find the speed of the train and the time it will take to cross a $540m$ long bridge.

An electric bulb of rating $\text{50W}$ is used for $\text{8hr}$ in one day. Find the number of units of energy used by the electric bulb. $1KWh=1unit$

Which of the following unit is not a fundamental unit :

(a) metre (b) litre

(c) second (d) kilogram.

How many leap years are there in a century?

Newton's first law says that if a body is at rest it remain at rest but if a body is moving in uniform linear motion it keep moving on and on and on untill a external force is applied ,so when I slip my book in straight line it stops after 3 s how this is done which force is stopping my book to keep moving .

A person's men's hundred metres in first 40 second 80 metres in the next 40 seconds and 45m in the last 20 seconds what is the average speed

What is distance?

_{Rest and motion are relative terms.Explain the statement.}

A particle travels along the X-axis. Its velocity time graph is shown above.

What is the velocity of the particle at time t = 7 sec

Use the following information to answer the next question.

Two plane mirrors, M₁ and M₂ are placed at a right angle. A ray of light is incident on M₁ at P₁and gets reflected from M₁. It then gets reflected from M₂ at P_2.

If OP₁ = OP₂, then the angle of reflection of the ray at P₂ will be

What is the reason for having a wide range of temperature on the surface of the moon?

What is average velocity

Man lifts a luggage of $12kg$ from the ground and puts it on his head $1.9m$ above the ground. Calculate work done by him on the luggage. Take acceleration due to gravity$=10m{s}^{-2}$.

Question 26 (a)

(a) A cube of side 5 cm is immersed in water and then in saturated salt solution. In which case will it experience a greater buoyant force. If each side of the cube is reduced to 4 cm and then immersed in water, what will be the effect on the buoyant force experienced by the cube as compared to the first case for water. Give reason for each case.

The pressure exerted by water (density = 103 kg/m3) on the bottom surface (2m × 4m) of tank having dimensions 2m × 4m × 2m is

Choose the correct option according to the angle between force and direction of displacement.

$\begin{array}{cc}\text{Coloumn 1}& \text{Coloumn 2}\\ 1.\theta \text{is zero}& \text{i) Work done is always zero}\\ 2.\theta \text{is less than}{90}^0& \text{ii) Work done is non-negative}\\ 3.\theta \text{is greater than}{90}^0& \text{iii) Work done is always positive}\\ 4.\theta \text{is}{90}^0& \text{iv) Work done is never positive}\end{array}$

A beaker full of water is suspended from a spring balance. Will the reading of the balance change :

(a) if a cork is placed in water?

(b) if a piece of heavy metal is placed in it?

Give reasons for your answer.

During a practice match, a softball pitcher throws a ball whose height can be modeled by the equation h = $-16t^2$ + 24t + 1, where h = height in feet and t = time in seconds. How long does it take for the ball to reach a height of 6 feet?

Among the four graphs, there is only one graph of which average velocity over the time interval (0, T) can vanish for a suitably chosen T. Which one is it?

The sun sends out a coronal mass ejection continuously towards earth having charged particles at the constant rate of $1.6\times {10}^{19}$ coulomb/sec throughout the day. Assuming that the sun and earth are maintained at a potential difference of 10,000 volt, find the energy received by India in 5 days.
Given India receives 10 % of the energy received by the face of the earth.

The SI unit of pressure is:

Calculate the effective resistance in the following circuit.

If the air on Earth's surface is replaced with water, then to what extent the water level must rise so as to maintain the same pressure $\left[{10}^5\frac{N}{m^2}\right]$ on Earth's surface? [Assume nothing above water surface. given g = 10 $m/s^2$, density of water = 1000 $kg/m^3$.

Which statement is true?
A Fthrust = Fg
B Fthrust = ¼Fg
C Fthrust < ¼Fg
D Fthrust > ¼Fg

General concept of vectors in detail

The acceleration - time graph for a uniformly chaging velocity is always?

How is the reading of a barometer affected when it is taken to a mine?

Select the rate law that conforms to the following data for the reaction : $A+B\to Products$
$\begin{array}{cccc}ExpNo.& \left[A\right]\left(mol{L}^{-1}\right)& \left[B\right]\left(mol{L}^{-1}\right)& Initialrate\left(mol{L}^{-1}{S}^{-1}\right)\\ 1& 0.0012& 0.0035& 1\times {10}^{-4}\\ 2& 0.024& 0.070& 8\times {10}^{-3}\\ 3& 0.024& 0.035& 1\times {10}^{-3}\\ 4& 0.012& 0.070& 8\times {10}^{-3}\end{array}$

A kid pushes his toy of weight 100 grams along a distance of 5 m on the floor. He applied force of magnitude 9 N. What is the work done by the kid to displace the toy? Is there any change in potential energy possessed by the toy?

Based on the following diagram, which of the following best represents how the Moon would appear as seen from the Earth?

A force, when applied on a body, can:

Which of the following is an example of uniform circular motion ?