Explore topic-wise InterviewSolutions in .

The heat produced in a wire due to current flow is give by

H =I2Rt

∴ΔH/H

= 2ΔI / I +ΔR/R +Δt / t

=2 x 0.02 + 0.01 +0.01 = 0.06 =6%

We know that :-Power=I²R=>100=3²×R=>R=100/9=11 ohm

the Pythagoreans theorem√13^2-12^2=5cmnone of these.

Force acting on the particle,F = Bqv. In vector form, F = q (v × B) where, B is uniform magnetic field, v is velocity with particle which is moving. From this equation, it is clear that direction of force is perpendicular to the plane containing both v and B. In other words, force acts perpendicular to both v and B. When velocity becomes perpendicular to force, the path of the object becomes circular.

hi....but this is asking for ratio?

Kinetic Energy = 1/2 * mass * velocity * velocity

Aparsecis defined as the distance at which one astronomical unit subtends an angle of one arcsecond, which corresponds to648000π astronomical units

pls like me if it helps you

1 ly=9.46×10^15 m

1 parsec=3.1×10^16 m

Hence

1 parsec=3.26 ly

It's the neareststarsystem to our sun at4.3 light-years away. That's about 25 trillionmiles(40 trillion km)awayfromEarth– nearly 300,000 times thedistance from the Earthto the sun

Sounds may be generally characterized bypitch,loudness, and quality. Sound "quality" or "timbre" describes those characteristics of sound which allow the ear to distinguish sounds which have the samepitchandloudness.Timbreis then a general term for thedistinguishable characteristics of a tone.

These qualities relate to different aspects of the sound, such as the volume or the duration. There are four sound qualities: pitch, duration,intensityand timbre

Object should be placed between pole and Focal Point

Initial obj. dist = -60(real object)". magnification (m) = -1/2 (as both obj and image are real)We know , m= -f/(u-f) [f=focal length]f= -20cmNow , obj dist = u'magnification(m')=2 (as image is virtual of real object)f=-20 cmWe know , m= -f/(u'-f)2=20/(u'+20)u'=-10cmHence , the obj should at a distance of 10 cm in front of the mirror.

Solid water—ice is frozen water. When water freezes, its molecules move farther apart, making ice less dense than water. This means that ice will be lighter than the same volume of water, and so ice will float in water. Water freezes at 0° Celsius, 32° Fahrenheit.

Liquid wateris wet and fluid. This is the form of water with which we are most familiar. We use liquid water in many ways, including washing and drinking.

Water as a gas—vapor is always present in the air around us. You cannot see it. When you boil water, the water changes from a liquid to a gas or water vapor. As some of the water vapor cools, we see it as a small cloud called steam. This cloud of steam is a miniversion of the clouds we see in the sky. At sea level, steam is formed at 100° Celsius, 212° Fahrenheit.

thanks

how did you get the second equation

X-Rays:-cancertreatment. High-energyradiation in much higher doses than what is used for X-ray imaging may be utilized to help destroy cancerous cells and tumors by damaging their DNA.

Microwave:-They can causewaterand fat molecules to vibrate so they are used forcookingin microwave ovens.

X rays have higher frequency and microwaves have higher wavelength.

According to Newton's law of cooling, we havemc (T1- T2)/t = k [(T1+ T2)/2 - T0)] ---------------(1)mc/k = [(T1+ T2)/2 - T0)]/[(T1- T2)/t]mc/k =[(80+50)/2 - 20)]/[(80- 50)/5] = 45/6

Substituting T1 = 60 and T2 = 30 and T0 = 20 (all in°C) in Eq. (1),

we getmc (60- 30)/t = k [(60+ 30)/2 - 20)]30 mc/t = 25 kt = 30 mc/(25k) = (30/25) x (45/6) = 9 minThe body takes 9 min to cool from60°Cto30°C.

Ans :- Disproportionationis a chemicalreaction, typically a redoxreaction, where a molecule is transformed into two or more dissimilar products. In a redoxreaction, the species is simultaneously oxidized and reduced to form at least two different products.Disproportionation reactions follow the form: 2A → A' + A"

use this formula to solve the equation.

I've already tried it

Velocity inSHM

Equation III istheexpression ofthe velocityof S.H.M.Thedouble sign indicates thatwhena particle passes through a given pointin thepositive direction of x, v is positive, andwhenit passes throughthesame pointinopposite direction of x, v is negative.

ok very easy

answer. is

(b) option

how the answer came??

Option m answer nii hai

Decreasing as the sign of acceleration is opposite to the sign of velocity