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A stone is dropped from a cliff. Find its speed after the stone has fallen from 100 m. Acceleration due to gravity$g=9.8\frac{m}{s^2}$

1. 1200000

A body weighs $36\text{N}$ at a depth equal to half of earth radius. The weight of the body on surface of earth will be

Question 12

Which of the following is not a green house gas?

(a) Nitrogen gas

(b) Water vapour

(c) Methane gas

(d) Carbon dioxide

Gravity is a ____ force.

Distinguish between:

(1) Distance and displacement.

(2) Uniform motion and non uniform motion.

In fusion reaction ${}_1^{2}H{+}_1^{2}H{\to }_2^{3}He{+}_0^{1}n,$ the masses of deuteron, helium and neutron expressed in $\text{amu}$ are $2.015,3.017$ and $1.009$ respectively. If $1\text{kg}$ of deuterium undergoes complete fusion, find the amount of total energy released $(1\text{amu}{c}^2=931.5\text{MeV})$.

Fill in the blanks:

(1) The tendency of a body to resist acceleration is called …………….. .

(2) In the SI system, ……………. is the unit of force.

(3) In a collision …………… is always conserved.

(4) The motion of rocket is based on Newton’s …………… law of motion.

(5) An …………… force acting on an object brings it in motion.

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

$\begin{array}{cc}\text{Column1}& \text{Column2}\\ 1.\theta \text{is}\text{zero}& i)\text{Work done is always zero}\\ 2.\theta \text{is less than}{90}^0& ii)\text{Work done is non-negative}\\ 3.\theta \text{is greater than}{90}^0& iii)\text{Work done is always positive}\\ 4.\theta \text{is}{90}^0& iv)\text{Work done is never positive}\end{array}$

John covers a part of the journey at 20 km/hr and the remaining at 70 km/hr, taking total of 8 hours to cover the distance of 400 km. How many hours he has been driving at 20 km/hr?

A body has negative acceleration while going upwards or downwards?

You lift a heavy book from the floor of the room and keep it in the book-shelf having a height 2 m. In this process you take 5 seconds. The work done by you will depend upon

A battery of 13 V is connected in series with resistors of $2\Omega ,3\Omega ,4\Omega ,5\Omega$ and $12\Omega$, respectively. How much current would flow through the $12\Omega$ resistors?

A vehicle covers 2 km in 10 minutes and then takes 6 minutes to cover the next 3 km. Which of the following graphs correctly depicts the motion of the vehicle?

Line AB denotes the motion for the first 2 km, and line BC represents the motion for the next 3 km.

In a given velocity-time graph, what happens to velocity between C and D?

The correct statement is :

(a) Sound and light both require medium for propagation

(b) Sound can travel in vacuum, but light can not

(c) Sound needs medium, but light does not need medium for its propagation

(d) Sound and light both can travel in vacuum.

Four balls, A, B, C and D displace 10 mL, 24 mL, 15 mL and 12 mL of a liquid respectively, when immersed completely. The ball which will undergo the maximum apparent loss in weight will be :
(a) A
(b) B
(c) C
(d) D

An object moving in a circular track of radius $7m$ completes one full revolution of the track in $7$ seconds. Its speed during the motion will be:

Use the following information to answer the next question.

A bulb glows less brightly when it is connected in series with a heater because th ethe bulb gets.

The information in which alternative completes the given statement?

Do all body is immersed in a given fluid experience the same byuonant force explain

The gravitational force between any two bodies is

Explain all the Newton's laws with examples in detail.

Which of the following is not a measure of energy?