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1. Methane: CH4 Ethanol: C2H5OH

2. Concave mirrorsareusedin reflecting telescopes. They are also usedto provide a magnified image of the face for applying make-up or shaving.

3. Terrestrial ecosystem Aquatic ecosystem

Infectious diseasescanspreadin a variety ofways: through the air, from direct or indirect contact with another person, soiled objects, skin or mucous membrane, saliva, urine, blood and body secretions, through sexual contact, and through contaminated food and water.

Marginal costis the increase or decrease in total productioncostif output is increased by one more unit.

Theformulato obtain themarginal costis change incosts/change in quantity.

If thepriceyou charge per unit is greater than themarginal costof producing one more unit, then you should produce that unit.

option 1

Preserve life – stop the person from dying. Prevent further injury – stop the person from being injured even more. If possible, an injured person should not be moved.

tnq a lot

C=√p/p whereby;c=speed p=pressure acting on the sound p=density of medium

The law states that in mediums of equal density & elastic force(the medium's pressure in Pascals,or Newtons over area measured in meters squared),all pulses are equally swift.The formula had a loop hole in that these mediums easily deforms when the forces are applied due to sound waves is being attenuated and absorbed when passing through solids that are easily deformed when force is applied.Laplace's correction to Newton's formula was that isothermal conditions were to prevail when sounds travels through air,Newton has applied Boyle's law to the changes in pressure and volume.

As in resonancexl= Xcnowmore current will flow through RsoIr+Ic less than 1

Given: resistance is 20 ohm conductor of 4 ohmr esistance 6V battery

1.The total resistance of the circuit = 20 ohm + 4 ohm =24 ohm

2. The current through the circuit = current through the bulb = current through the conductorThe current through the circuit = Voltage applied/ the voltage of the battery= (6/24) amp =0.25 amp 3. The potential difference across the electric lamp and the conductor. = 0.25 ×20 = 5 volt = 0.25 × 4 = 1voltLike my answer if you find it useful

The core of Electromagnet is option ( a) soft iron.

the correct answer is a soft iron

The answer is (a) that is soft iron

A dipole antenna is a half wave resonant antenna usually 1/4 wave above ground. Its feedpoint in the center is unbalanced and usually fed with 75 ohm coaxial cable. The feedpoint can also be balanced and fed with tuned feeders. That makes for a harmonically rich antenna and very low loss feeders. The dipole is the most common antenna used in radio frequencies for ham radio operators as it's so simple.

Thanks buddy

No problem..it helps in my preparation

already given the answer!

what is your question

this question is wrong

yes this question is wrong

current will same in all the terms

current will be 59.5 amphere

yes this question is wrong

When a p-n juction is forward biased,minority carriersareinjectedinto the semiconductors on the two sides of the junction. Theseminority carriersdiffuse about an eventually recombine with the majoritycarriers. The distribution of theminority carriersisdescribedby the diffusion equation.

The maximumreverse bias voltagethat can be applied to a p-n diode is limited bybreakdown.Breakdownis characterized by the rapid increase of the current underreverse bias. The corresponding appliedvoltageis referred to as thebreakdown voltage. Thebreakdown voltageis a key parameter of power devices.

putting formula P=VI 60=220×II=60÷220 NOW WE PUT V=I R FOR BOTH THE BULBS THEN THE 1ST ANSWER WILL COME(ii) 1ST WILL BLOW BRIGHT

1. the acceleration due to gravity g = G M / (Re+h)² Gravity is less at an altitude h from the surface of Earth. Hence, the ball bounces higher. Suppose the ball rebounds with a velocity v. S = distance it rises to = v² / 2 g.

As, g is less on mountains, S is more.

2. Also, air pressure is less. The drag resistance due to air is less. So the ball bounces higher.

It's because if the diode is forward biased it will conduct a lot of current and you can't detect the small amount of excess current produced by the photoelectric effect. When the diode is reversed biased, no ordinary current flows and the detection of the photo-current is much easier.

1.Oils-Oils are thin liquids made of long polymer chains, with additives for various extra properties. Common additives include antioxidants to keep the oil from oxidizing, corrosion inhibitors to prevent parts from corroding, and detergents to keep deposits from forming.2.Greases -Theyare made by using oil and mixing it with thickeners (such as lithium-based soaps). Greases combine the lubricating properties of oils with added stickiness, allowing the lubricant to adhere to the surfaces better.3.Penetrating Lubricants-Any shade-tree mechanic would agree that these types of lubricants deserve their own special section. Penetrating lubricants are the saviors of many stuck-bolt combatants, loosening years of rust and debris in minutes4.Dry lubricants-They are made up of lubricating particles such as graphite, molybdenum disulfide, silicone, or PTFE. At the molecular level, these particles are super slippery, so they reduce the friction between surfaces in contact with one another. It’s common to find these lubricants in spray form

A tendon connects a muscle to a bone

thank you

Minimum force required = Limiting friction= μN= μmg= 0.5 * 2 * 10= 10 N

17.Limiting friction = 10 NExternal force = 10 NNet force = 0Acceleration = 0

If net force is 0 then it means body is moving with constant velocity (a = 0).

Magnetic Force can be defined as the attractive or repulsive force that is exerted between the poles of a magnet and electrically charged moving particles. It is a consequence of the electromagnetic force

As the static frictional force = 10N

=> the body will not move for any force less than 10N

=> whatever force applied if it is less than 10 N then it will be applied to overcome static frictional force_______________________________

=> here 6N if force is applied=> 6 N will be the magnitude of frictional force on the block

This is because.... as we apply 6 N the block also apply reaction force 6 N and as Action and reaction are equal and opposite... the block doesn't move...

thank you

Force due to virtue of mass is gravitational force as the force isF = GMm/r²so option (c) is correct

thanks for the answer

I’ll assume the applied force is parallel to the slope.

It has to overcome friction (150N) and the component of weight down the slope (= 300Sin30 = 150N again)

So, 300N

If it is applied at some other angle, we’d need to know it. And anything not parallel to the slope would affect the Normal Reaction and hence the Friction

Let the acceleration of the larger body be 'A' let its mass be 'M'

let the acceleration of the smaller body be 'a' and its mass be 'm'

then according to the question

MA=ma

or, A/a=1/2

also since the bodies start from rest and their displacements are the same therefore using the second equation of motion we get

1/2AT^2= 1/2at^2

where T and t are respectively the time taken by the larger and smaller bodies respectively to cover the distance.Thus we get

T^2/t^2 =2/1

or,T/t=2/1

Thus the ratio required is 2:1

The new time period is given by T₁ = √3T/2

Explanation:

Case I

string length = l

string is stretched to 2l, so net increase in length = 2l - l = l

=> spring force, F = kl

where k = spring constant

when the string is rotated with 2l radius,

we know that centripetal force is given by,

F = mrω² = m x 2l x (2π/T)²

Since the centripetal force and spring force should be equal, hence,

kl = m x 2l x (2π/T)²

=> k = 2m x (2π/T)².............eq1

Case II

string length = l

string is stretched to 3l, so net increase in length = 3l - l = 2l

=> spring force, F = k x 2l = 2kl

when the string is rotated with 3l radius,

we know that centripetal force is given by,

F = mrω₁² = m x 3l x (2π/T₁)²

Since the centripetal force and spring force should be equal, hence,

2kl = m x 3l x (2π/T₁)²

=> k = 3m/2 x (2π/T₁)².............eq2

equating eq1 and eq2 we get:

2m x (2π/T)² = 3m/2 x (2π/T₁)²

=> T₁²/T² = 3/4

=> T₁ = √3T/2

Hence the new time period is given by T₁ = √3T/2

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It is due to the refraction ofsunlightas it travels through Earth's atmosphere. ... Refraction of light by these layers can make thesun appear flattenedor distorted. Objects closer to thehorizon are raised upwards most and the lower limb of theSunis raised more than the top making itappearoval

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s-displacement, u-initial velocity, v-final velocity,a- acceleration, t-timev=u + atv2 = u2 + 2ass=1/2(u+v)ts=ut + 1/2at^2

a)Calculate the average acceleration when the motors were firing:av. acceleration = change in velocity = 120 - 75 = 45m/s = 7.5m/s^2 time 6s 6s

therefore the average acceleration = 7.5km/s^2

b)Distance traveled after the rockets were fired:- Find distance traveled during the 6s when the motors were firing:t=6s, v=120 km/s, u=75km/s, a=7.5km/s2s= 1/2(u+v)t = 1/2(120+75)6 =1/2 x 195 x 6 = 585 km-Find distance after the motors are fired:(the next 4 seconds to make it 10 seconds)After the motors are fired, the craft moves with 120km/s speedThat means in 4s = 4 x 120 = 480kmadd the distance traveled in the 10s = (585 + 480)km = 1065kmTherefore the total distance traveled = 1065 km

The answer is 25 Watts bulb will fuse earlier than the 100 Watts bulb.

Why?

Resistance= Voltage^2 / Power

As we see both the bulbs has a voltage rating is 220 Volts. , hence voltage remains constant in both the cases.

Now, the bulb which has lower power rating will have higher resistance.

But,

As per the question both the bulbs are connected in series. Hence, both the resistances will add into one.

In series connection, the equipment with higher resistance have to bear more Voltage. So, the 25Watts bulb will fuse first.

Let's Calculate:

Resistance Calculation:

R-25= 220^2/25=1936 Ohms.R-100= 220^2/100 = 484 Ohms.

Both bulb are in series, hence total resistance=1936+484=2420 Ohms.As we knowVoltage=Current*Resistance

Current Calculation:

For440 V, current is:440 V/ 2420 Ohms =0.1818 Amperes.

Voltage Calulation:

the Voltage across 25 W bulb will be:Current * Resistance of 25 watt bulb

= 0.1818*1936 = 352 Volts.

Voltage across 100 W bulb will beCurrent * Resistance of 100 Watts bulb= 0.1818*484 = 88 Volts.

As per the above calculation, You can see the 25 Watts bulb will fuse because it will experience a very high amount of voltage, however, 100 Watts bulb will not fuse and it'll glow with low intensity.

Thanks for your patience.

Double because it will

3) The output will increase

Increase is correct answer

the out put will increas

Option A

1) 3.5v is correct answer

Time = 8 hrsavg speed= distance/time.distance=400km.speed=400/8=50km/h.50km/h=50×5/18 m/s.speed=250/18 m/s.

3.5

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Question- An electric bulb draws a current of 0.25 A for 20 minutes. Calculate the amount of electric charge that flows through the circuit.

Solution:According to question,Current, I=0.25 ATime, t=20 minutes=20 x 60 seconds [As, 1 minute=60 seconds]=1200 secondsNow, we have a relation,I=Q/tOr Q=I x tPutting the values, we getQ=0.25 x 1200=300 coulombsTherefore, the amount of charge that flows through the circuit is 300 coulombs.

the right answer is 300 coulombs

q= I(current)*(t) time

where time is time in secondq= 0.30*10*60= 30*600/100= 180ampere/ secondplease like the solution 👍 ✔️👍

sir d kis se denote kre ge

(i) Initial velocity, u = 72 km/h = 72×(5/18) m/s = 20 m/s Final velocity, v = 54 km/h = 54×(5/18) m/s = 15 m/s Time in which velocity changes is, t = 10 s Acceleration, a = (v - u)/t => a = (15 - 20)/10 = -0.5 m/s^2 (ii) distance travelled by the bus Its avg speed over the 10 sec is (15 + 20)/2 = 17.5 m/sec 17.5*10 = 175 meters

1) 3.5v is the correct answer

Let ratio be=Current:volt3.4:220=x:1103.4/220=x/110X=3.4*110/220=1.7A

1) electrical to mechanical energy2) electrical energy into heat energy3) solar energy into electrical energy4) sound energy into electrical energy5) electrical energy into heat energy6) chemical energy into heat energy