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Ask QuestionPosted by Swasti Ranjan 5 years, 5 months ago
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Yogita Ingle 5 years, 5 months ago
Joule is the unit for energy
Dimension Formula for Joule is [M¹L²T⁻²]
Let n1(joule)=n2(erg)
n1(M₁¹L₁²T₁⁻²]=n2[M₂¹L₂²T₂⁻²]
n2=n1(M₁¹L₁²T₁⁻²] /M₂¹L₂²T₂⁻²]
=n1x(M1/M2)¹x(L1/L2)²x(T1/T2)⁻²
=1x(1kg/gm)¹x(1m/1cm)²x(1s/1s)⁻²
=1x(1000g/gm)x(100cm/1cm)²x(1s/1s)⁻²
=10⁷
Therefore n1(joule)=n2(erg)
∴1 Joule=10⁷erg
Posted by Apurva Gupta 5 years, 5 months ago
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Posted by Gurleen Kaur 5 years, 5 months ago
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Dr. Prasun Sharma Chowdhury 5 years, 5 months ago
According to Newton's Second Law: If a particle of mass {tex}m{/tex} has velocity {tex}v{/tex} at any moment {tex}t{/tex},
{tex}\vec{F}=\frac{d\vec{p}}{dt}{/tex}, where {tex}\vec{F}{/tex}is the force and {tex}\vec{p}=m\vec{v}{/tex} is the momentum.
Thus,
{tex}\vec{F} =\frac{d(m{\vec{v}})}{dt} =m\frac{d\vec{v}}{dt}+\vec{v}\frac{dm}{dt}{/tex}
For cases where mass changes with time, the above equation would be applicable.
Special Cases:
- If mass remains constant, as we see in most theories an numericals, {tex}\frac{dm}{dt}=0{/tex} hence, {tex}\vec{F}=m\frac{d\vec{v}}{dt}=m\vec{a}{/tex}, where {tex}\vec{a}{/tex} is the acceleration of the object.
- If the velocity remains constant but mass emerges out or gets added at a constant rate, as in cases of water coming out of hose pipe, or sands added at constant rate upon a moving belt; {tex}\vec{F}=\vec{v}\frac{dm}{dt}{/tex}.
Posted by Tushar Goswami 5 years, 5 months ago
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Sia ? 4 years, 6 months ago
Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.
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Gaurav Seth 5 years, 5 months ago
Conventional Sources of Energy:
The sources of energy which have been in use since a long time are called conventional sources of energy. Coal, petroleum, natural gas, hydel energy, wind energy and nuclear energy are considered to be the conventional sources of energy. Additionally, firewood is also a conventional source of energy but its usage is now limited to kitchens in rural parts of India.
Fossil Fuels:
Coal: Coal was formed millions of years ago. The plants got buried under swamps and due to high pressure and high temperature inside the earth; they were converted into coal. Coal is the highest used energy source in India. During the days of steam engine, coal was used in steam engines. Moreover, coal was also used as kitchen fuel; before LPG became popular. Now-a-days, coal is mainly being used in the industries.
Petroleum: Petroleum was also formed millions of years ago. The animals got buried under the ocean surface and were converted into petroleum; in due course of time. Petroleum is the third major source of energy being used today. Petroleum products are used as automobile fuel and also in the industries. Natural gas mainly comes from oil wells and is also a major source of energy.
Non-renewable Sources of Energy: It takes millions of years for the formation of fossil fuels. Since they cannot be replenished in the foreseeable future, they are known as non-renewable sources of energy.
Renewable Sources of Energy: Those sources of energy which can be replenished quickly are called renewable sources of energy. Hydel energy, wind energy and solar energy are examples of renewable sources of energy.
<hr />Hydel Energy: Hydel energy is produced by utilizing the kinetic energy of flowing water. Huge dams are built over a source of water. Water is collected behind the dam and released. When water falls on urbine; the turbine moves; because of kinetic energy of water. Thus, electricity is generated by the turbine. Electricity; thus generated is called hydel energy or hydroelectricity. Water in the reservoir is replenished with rainwater and so availability of water is not a problem for hydroelectricity.
Thermal Power Plant: In a thermal power plant, coal or petroleum is used for converting water into steam. The steam is used to run the turbine; to generate electricity.
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Akhil? . 5 years, 5 months ago
APKE YHA BAGAL ME BHI KISI KO HO GYA H KYA?? ?
DIKU KO LGTA HOGA KOI AATA HI NHI ISLIYE VO BHI NHI AATI HOGI... AAJ BOL DUNGI USSE...
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Posted by Vinay Kumar 5 years, 5 months ago
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Yogita Ingle 5 years, 5 months ago
Joule's law of heating.
The amount of heat produced is proportional to
- electrical resistance when the current in the circuit and the flow of current is constant
- the square of the current flow through the circuit when the electrical resistance and current supply is constant.
- the time of flow when the resistance and current flow is kept constant.
The relationship between heat produced by flowing current through a conductor is given by:
{tex} Q = i^2 R T {/tex}
Where,
Q - the amount of heat
i - electric current
R - amount of electric resistance in the conductor
T - time
Posted by Vinay Kumar 5 years, 5 months ago
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Yogita Ingle 5 years, 5 months ago
Dimensional analysis for formula of frequency of oscillating liquid drop.
r= radius = [L].
d= p= density = [M ][L^-3]
S = Surface Tension = [M T^-2]
n = frequency = k* r^a * p^b * S^c.
So [T^-1] = [M^b+c] [L^a-3b] [T^-2c]
Equating powers: a = -3/2. b= -1/2. c=1/2.
Answer: n = k* sqrt(S/(p*r^3))
Or n = k* sqrt (S/m).
m = mass of the drop.
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