Water vapour diffuses faster than ethyl alcohol or wax.

Explanation:

When the matters of two different types of particles of are intermixing on their own, this is called as diffusion. The diffusion rate increases with increase in the diffusion temperature of the substance. It is a natural process. Diffusion process occur place in the “solid, liquid and gas”. Since water vapour is in the state of gas, the kinetic energy is maximum between the particles in the gases. Therefore, the movement of particles is in high speed and its movement has no fixed shape and volume. Gases diffuse faster than solid and liquid. The inter molecular space in gas is more and inter molecular forces are less.

Wood is not a pure substance it is a mixture, because it is composed of compounds such as cellulose, hemicelluloses, and lignin which are made up of elements such as carbon, hydrogen, and oxygen. Wood is a heterogeneous mixture. Pure substances are filled entirely with elements or compounds, whereas mixtures are multiple compounds mixed either uniformly (homogeneous mixture) or non-uniformly (heterogeneous mixture).

Endosmosis: When there is passage of a fluid in this case water, from a region of lower concentration to a region of higher concentration through a semipermeable surface (the membrane of a cell), the process is known as endosmosis.

Exosmosis: Exosmosis is the passage of water through a cell membrane (semipermeable) toward a surrounding medium of lower concentration.

Therefore a cell will display endosmosis when it shrinks by losing water when placed in a water or display exosmosis when it swells up or enlargens when placed in a water.

Let us consider an object of mass m, moving along a straight line with an initial velocity u. Let us say, after a certain time t, with a constant acceleration, the final velocity becomes v.Here we see that, the initial momentum
p₁ = m  × u 
The final momentum
p₂ = m  × v
The change in momentum can be written as
p₂ - p₁ = (m  ×v)  - (m  ×u)= m (v-u)

As we know, the rate of change of momentum with respect to time is proportional to the applied force. The applied force
F∝  [m  × (v-u)]/t
or

F∝  m  × a
as acceleration (a) = rate of change of velocity with respect to time
.F= k × m  × a

Above is the second law of motion formula.

Hydrogen symbol is (H)

Mercury is the fastest planet, which speeds around the sun at 47.87 km/s. In miles per hour this equates to a whopping 107,082 miles per hour. 2. Venus is the second fastest planet with an orbital speed of 35.02 km/s, or 78,337 miles per hour.  The orbital speed can be found using v = SQRT(G*M/R). The R value (radius of orbit) is the earth's radius plus the height above the earth - in this case, 6.77 x 106 m. This means that Jupiter has the shortest days of all the planets in the solar system. Venus is the slowest - it rotates once every 243 days —- by far the slowest rotation period of any of the major planets. A Venusian sidereal day thus lasts more than a Venusian year (243 versus 224.7 Earth days).

Characteristics of matter that are demonstrated by diffusion are:

1. Particles have inter-particle spaces between them.

2.Particles of matter attract each othe, which is strongest in case of solid, little less in case of liquid and least in case of gases.

3. State of matter which is closely packed diffuses slowly.

Take a 100 mL beaker.

• Fill half the beaker with water and

mark the level of water.

• Dissolve some salt/ sugar with the help

of a glass rod.

• Observe any change in water level.

Explanation:

When we dissolve salt in water, the particles

of salt get into the spaces between particles

of water.

Here, initial velocity, u = 0

Acceleration, a = 2 cm s^-2

Time, t = 3 s

From, Ist equation of motion, v = u + at = 0 + 2 x 3 = 6 ms^-1

Plasma is the clear, straw-colored liquid portion of blood that remains after red blood cells, white blood cells, platelets and other cellular components are removed. It is the often forgotten component of blood

Mitosis gives identical cells to each other and to the mother cell, while meiosis leads to genetic variation due to crossing over and independent assortment. Mitosis gives nuclei with the same number of chromosomes as the mother cell while meiosis gives cells with half the number. The fundamental difference between mitosis and meiosis is that mitosis produces two daughter cells with the same number of chromosomes as the parent cell. Meiosis results in four daughter cells harboring only half of their parent's chromosomes, which underwent recombination.

1. The mass of an object is the quantity of matter contained in it whereas the weight of an object is the force with which it is attracted towards the centre of the earth.

2. The SI unit of mass is kilogram whereas the SI unit of weight is newton.

3. The mass of an object can never be zero whereas the weight of an object can be zero.

• Equation For Position - Velocity Relation:

From the velocity-time graph, the distance s travelled by the object in time t, moving under uniform acceleration a is given by the area enclosed within the trapezium OABC under the graph. That is,

s = area of the trapezium OABC = (OA + BC) X OC/2

Substituting OA = u, BC = v and OC = t,

We get

s= (u+v) t/2

From the velocity-time relation

We get

t= v - u/a

We have

s = (v + u) x (v – u)/2a

or 2as = v² – u²

Diffusion in gas:

Diffusion takes place most rapidly in gasses.

The particles of gas have more kinetic energy due to that they move with high speed. Because of the movement of particles with high speed gas diffuses most rapidly.

Example: Mixing of gases in air

Diffusion in liquid:

Diffusion takes place in liquids. The rate of diffusion is less in liquid than that of gases.

The particles of liquid have enough movement because of kinetic energy for diffusion. When two liquids are kept together they are mixed because of the diffusion.

For example; When salt solution is kept in water this makes whole the solution salty after some time. This happens because of diffusion in liquids.

Diffusion in solid:

Diffusion takes place with slowest rate in the case of solids. The rate of diffusion is almost negligible in solids.

Since the particles of solid have lowest kinetic energy so they do not move. Hence, diffusion takes a long time in the case of solid.

Example – Some time we observe that the marks of chalk on the black board could not be wiped out easily after a long time. This happens because of the diffusion of particles of chalks with the particles of black-board and marks of chalk could not be wiped out.

The ribosomes are the sites of protein manufacture. The SER helps in the manufacture of fat molecules or lipids. Some of these proteins and lipids help in building the cell membrane. This process is known as membrane biogenesis. Some other proteins and lipids function as enzymes and hormones.

Impulse = change in linear momentum .

Initial momentum of ball= mu
=0.15 × 12 =1.8 kg.m/sec

Final momentum of ball = -mu
= - 0.15 × 12 = -1.8 kgm/sec
Change in momentum of ball =final -initial
= -1.8 -1.8 = -3.6 kgm/sec

So,
Change in momentum of bat = -change in momentum of ball

Change in momentum of bat =3.6 kgm/s

Impulse imparted to ball =change in momentum of bat = 3.6 kgm/s