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ong>Answer:

As e oscillates about zero, i also oscillates about zero and HENCE there cannot be any time independ ent component of current. Comparison of this EQUATION with e = e0 sin wt SHOWS that e leads i by π/2 rad, i.e., the VOLTAGE is ahead of current by π/2 rad in phase.

Explanation:

i hope this answer is right

PHOTOSYNTHESIS, the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon DIOXIDE, and minerals into OXYGEN and energy-rich ORGANIC compounds.

PROBLEM of AIR pollution increase due to soil pollution

physics, a FORCE is any interaction that, when unopposed, will change the MOTION of an object. A force can cause an object with mass to change its VELOCITY, i.e., to accelerate. Force can also be described INTUITIVELY as a push or a pull. A force has both magnitude and direction, making it a vector QUANTITY.

ong>Answer:

8 mg

Explanation:

LET lowest point val. = v

work energy principle

wall=0K

w

G

+w

Y

=K

f

−K

i

[∵w

p

= work done by tension = 0]

mg(2r)=

2

1

m(

3rg

)

2

−

2

1

MV

2

2mgr=

2

3

mgr−

2

1

mv

2

mv

2

=3mgr+4mgr

∴v=

7GR

∴F

=T−mg

r

m(

7gr

)

2

=T−mg

⇒T=7mg+mg=8mg

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ong>Answer:

Uses of Concave Lens

Used in TELESCOPE. Concave lenses are used in telescope and BINOCULARS to magnify OBJECTS. ...

Used in Eye Glasses. Concave lenses are most commonly used to correct myopia which is also CALLED nearsightedness. ...

Used in Peepholes.

Explanation:

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ong>ANSWER:

Chemistry, Applied Physics and TECHNOLOGY are based on human beings ability to think and be challenged by new discoveries and new ideas. The ideas from human beings SEEM to have no LIMITS but will DEFINITELY end when all human beings will die from catastrophes.

crofball

it HELPFUL to you

2.5×10^9

as we KNOW: E=F/q

E= 50/2×10^-8

E= 2.5×10^9

This is will HELP U

_______________

ong>EXPLANATION:

Momentum Conservation Principle For two or more bodies in an isolated system acting upon each other, their total momentum remains CONSTANT UNLESS an external force is APPLIED. Therefore, momentum can NEITHER be created nor destroyed.

ong>Answer:

UNIVERSAL circuit

Explanation:

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ong>ANSWER:

TUJHE koi problem to ni h n

mai jinda hu to

Explanation:

I THINK answer is 3.od

Explanation:

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19

Explanation:

9+5=14+5=19 the SCALAR PRODUCT

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ong>Answer:

13.4 Satellite Orbits and Energy

Learning Objectives

By the END of this section, you will be able to:

Describe the mechanism for circular orbits

Find the orbital periods and speeds of satellites

Determine WHETHER objects are gravitationally bound

The Moon orbits Earth. In turn, Earth and the other planets orbit the Sun. The space directly above our atmosphere is filled with artificial satellites in orbit. We examine the simplest of these orbits, the circular orbit, to understand the relationship between the speed and period of planets and satellites in relation to their positions and the bodies that they orbit.

Circular Orbits

As noted at the beginning of this chapter, Nicolaus Copernicus first suggested that Earth and all other planets orbit the Sun in circles. He further noted that orbital periods increased with distance from the Sun. Later analysis by Kepler showed that these orbits are actually ellipses, but the orbits of most planets in the solar system are nearly circular. Earth’s orbital distance from the Sun varies a mere 2%. The exception is the eccentric orbit of Mercury, whose orbital distance varies nearly 40%.

Determining the orbital speed and orbital period of a satellite is much easier for circular orbits, so we make that assumption in the derivation that follows. As we described in the previous section, an object with negative total energy is gravitationally bound and THEREFORE is in orbit. Our computation for the special case of circular orbits will confirm this. We focus on objects orbiting Earth, but our results can be generalized for other cases.

Consider a satellite of mass m in a circular orbit about Earth at distance r from the center of Earth (Figure 13.12). It has centripetal acceleration DIRECTED toward the center of Earth. Earth’s gravity is the only force acting, so Newton’s second law gives

GmMEr2=mac=mv2orbitr.

A drawing SHOWS a satellite orbiting the earth at radius r. The orbit is shown as a blue circle centered on the earth. A red arrow at the satellite points toward the center of the earth and is labeled F and a green arrow tangent to the orbit is labeled v.

Figure 13.12 A satellite of mass m orbiting at radius r from the

ENGLISH

Explanation:

because english is a very IMPORTANT subject

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your ANS,in ATTACHMENT.

ong>Answer:

PLZ MARK as BRAINLIST please

your answer is in attachment

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ong>Answer:

the photoelectric WORK FUNCTION is that of the minimum STOPPING POTENTIAL and the second one ???

ong>Answer:

0.4 ohm

Explanation:

Conductance is the RECIPROCAL of RESISTANCE

HENCE 2.5 =1/ R

R =0.4 ohm

ong>EXPLANATION:

Δϕ=90

∘

=

2

a

Δx=0.8m

we know that Δϕ=

α

2π

×Δx

So λ=

Δϕ

2π×Δx

=

π/2

2π×0.8

⇒

λ=3.2m

v=120Hz & v=vλ

velocityv=120×3.2=384m/s

something LIKE this

trong>Theоrem оf раrаllel аxes : It stаtes thаt the mоment оf inertiа оf а bоdy аbоut аn аxis is equаl tо the SUM оf mоments оf inertiа оf the bоdy аbоut а раrаllel аxes раssing thrоugh its сentre оf mаss аnd the рrоduсt оf mаss аnd the squаre оf distаnсe between twо раrаllel аxes.

➤picture kindly REFER in attachment

● For example : Moment of inertia of disc about an axis perpendicular to the PLANE of disc and through its centre.

➤picture kindly refer in attachment.

●then, moment of inertia about an axis

● I = Icm + Mh²

● 1/2 MR² + MR²

● as H = R

● I = 3/2 MR² ( according to theorem of parallel AXES.)

● where,

• M = mass of lamina
• h = distance between two parallel axes.

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ong>Answer:

HEY MATE !!

HERE IS UR ANS ⤵️⤵️

option b 11 Newton to right is ur CORRECT ans !

... HOPE THIS HELPS U ALMOST ...

... THANK Q ...

꧁꧁ ༒ λKŞU ༒꧂꧂

ong>Answer:

The boiling litre of water has more VOLUME and so has more HEATED molecules per cubic METRE so it will have a higher amount of heat than the glowing nail. To practically test this, PUT the glowing nail into a litre of cold water and record the final temperature when the nail has cooled down.

ave to find the percentage change in length of 4m iron rod if its TEMPERATURE changes by 200°C. coefficient of iron is 2 × 10¯⁵/°C.

solution : change in length is given by, ∆L = L₀α∆T

⇒fractional change = ∆L/L₀ = α∆T

⇒percentage change = ∆L/L₀ × 100 = 100α∆T

here α = 2 × 10¯⁵/°C and ∆T = 200°C

so, percentage change in length of iron rod = 100 × 2 × 10¯⁵ × 200

= 4 × 10⁴ × 10¯⁵ = 0.4 %

Therefore the CORRECT option is (B) 0.4 %

also READ similar questions : Why a brown coating is formed on the iron rod when iron rod is kept dipped in copper sulphate solution for SOMETIME? Wha...

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An iron rod of lenght 30cm is heated through 50 kelvin calculate its increase in lenght (linear expansivity of iron=1.2 ...

brainly.in/question/17700596

ong>EXPLANATION:

Steel is an eloy of IRON and small AMOUNT of carbon.

ong>Answer:

FOUND GUILTY of fraud, the French chemist was EXECUTED on 8 May 1794. While Lavoisier was UNPOPULAR among other scientists, it was his INCOME that proved most troublesome.

ong>Explanation:

shears stress is the ratio of tension per UNIT AREA while shears strain is the ratio of CHANGE in length to unit original length. so, modulus of rigidity or shears modulus, it is the EXPRESSION for the Modulus of rigidity. now, S.I unit of is N/m² or Pascal.

ong>ANSWER:

bin KAM ke report karte HAI

ong>ANSWER:

heredity is the transfer of biological character from one generation to another generation via gens.

Explanation:

the passing on of physical or MENTAL characteristics GENETICALLY from one generation to another.

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Dimitri Endeeleve..

Yup sure have a bangtastic DAY AHEAD:)

SARANGHAE

When we push hard against a wall, the force we exert on the wall does no WORK, because DISPLACEMENT s is zero.

ong>ANSWER:

amplitude. ... The DISPLACEMENT amplitude is the maximum change in POSITION. The VELOCITY amplitude is the maximum change in velocity. The acceleration amplitude is the maximum change in acceleration.

ong>Answer:

HI hearthacker se DOSTI Karo GI

ong>Answer:

A SIMPLE example of zero work is when you STAND holding a bag in your hands and do not move it. Your hands apply a force on the bag to balance the force of gravity exerted on it but since there is no displacement of the bag, the work done on it by you (your force) and ALSO the gravity is zero.

In short: Yes, no work is done because the particles does not move, thus →s=0. Yes, you can CALCULATE the work done by each force. ... Note that because there is no displacement, the value of the applied FORCES are equal.

वघतु ᭢ल᭍स स᭥ब᭠धी गॉस का िनयम िलिखए एव ंिस᳍ कᳱिजय े

ONE Way

Explanation:

I THINK the correct answer is WAVES

>

ᴛʜɪs ᴏɴʟʏ ʜᴀᴘᴘᴇɴs ᴡʜᴇɴ :-

★ ᴛʜᴇʀᴇ ɪs ɴᴏ ʟᴏᴀᴅ ᴘʟᴀᴄᴇᴅ ᴏɴ ᴛʜᴇ ʙᴀᴛᴛᴇʀʏ ᴛʜᴀᴛ ɪɴᴄʟᴜᴅᴇs ᴍᴇᴀsᴜʀɪɴɢ ᴛʜᴇ ᴘᴏᴛᴇɴᴛɪᴀʟ ᴅɪғғᴇʀᴇɴᴄᴇ ᴡɪᴛʜ ᴀ ᴠᴏʟᴛᴍᴇᴛᴇʀ.

★ ᴛʜᴇ ᴛᴇʀᴍɪɴᴀʟ ᴠᴏʟᴛᴀɢᴇ ᴡɪʟʟ ᴇxᴄᴇᴇᴅ ᴛʜᴇ ᴇᴍғ ᴏғ ᴛʜᴇ ʙᴀᴛᴛᴇʀʏ ᴡʜᴇɴ ᴄᴜʀʀᴇɴᴛ ɪs ᴅʀɪᴠᴇɴ ʙᴀᴄᴋᴡᴀʀᴅ ᴛʜʀᴏᴜɢʜ ᴛʜᴇ ʙᴀᴛᴛᴇʀʏ, ɪɴ ᴀᴛ ɪᴛs ᴘᴏsɪᴛɪᴠᴇ ᴛᴇʀᴍɪɴᴀʟ ᴀɴᴅ ᴏᴜᴛ ᴀᴛ ɪᴛs ɴᴇɢᴀᴛɪᴠᴇ ᴛᴇʀᴍɪɴᴀʟ.

■ ʜᴏᴘᴇ ɪᴛ ʜᴇʟᴘs ʏᴏᴜ ᴅᴇᴀʀ ■

ong>Answer:

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What are the Characteristics of Electromagnetic Waves?

Listed below are some important characteristics and properties of electromagnetic waves.

Electromagnetic waves are TRANSVERSE in nature as they propagate by varying the electric and magnetic fields such that the two fields are perpendicular to each other.

Accelerated charges are responsible to produce electromagnetic waves.

Electromagnetic waves have constant velocity in vacuum and it is nearly equal to 3×108ms−1 which is denoted by C = 1√μoϵo.

Electromagnetic wave propagation does not require any material medium to travel.

The inherent characteristic of an electromagnetic wave is its frequency. Their frequencies remain UNCHANGED but its wavelength changes when the wave travels from one medium to another.

The refractive index of a material is given by:n = √μrϵr

Electromagnetic wave FOLLOWS the principle of SUPERPOSITION.

The light vector (also KNOWN as the electric vector) is the reason for the optical effects due to an electromagnetic wave.

In an electromagnetic wave, the oscillating electric and magnetic fields are in the same phase and their magnitudes have a constant ratio. The ratio of the amplitudes of electric and magnetic fields is equal to the velocity of the electromagnetic wave.C = E0B0

The energy is carried by the electric and magnetic fields of electromagnetic waves are equal, i.e. the electric energy (uE) and the magnetic energy (uM) are equal; uE = uM.

There is a vector quantity S, called the Poynting vector which represents the energy transferred by electromagnetic waves per second per unit area.

Explanation: