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1.Sunflowers are a example of positive phototropism.

2.Anexample of geotropismis the roots of a plant growing down into the ground.

3. The shoots or aerial parts of a plant grow away from gravity -- that is, they grow up. This isnegative geotropism, since the shoot of the plant is growing in the opposite direction of gravity.

ऑप्शन (क‌) सही है ।

answer is koyal hai

Koyla (a) right h hhhh

b) Petroleum prakritik Sansadhan hai

The direction of force will be same as of the direction of its acceleration

so, we need to find the direction of acceleration "a"

now , r = 3ti + 5t²j + 7k

so, dr/dt = 3i+10tj + 0k

again d²r/dt² = a = 10j

so, the direction of force is in ĵ .

Torqueis defined as→τ=→r×→F(→ris the position vector and→Fis the force vector)

So, here→τ=(i−j+k)×(7i+3j−5k)=(2i+12j+10k)

So,∣∣→τ∣∣=√4+144+100=√248=15.74N.m

Given:speed = 60km/hrTime (t1)= 1hr , time(t2)=30min= 30/60= 1/2 hr

Distance travelled by a car in East direction(s1)= speed× t1 = 60× 1= 60km

Distance travelled by a car in south direction(s2)= speed× t1 = 60×1/2= 30 km

Displacement from intial position(s)= √(s1)²+(s²)²= √ (60)²+(30)²= √3600+900= √900(4+1)= 30√5Displacement= 30√5km__________________

b option is correct

Option d is correct answer

option b is correct.Speed will remain constantas force is perpendicular so the path will be circular

when particle is at starting point , displacement will be 0

=> r = 0=> (1-at)t = 0=> at = 1=> t =1/a

Since the graph is not linear and the vehicle stops after a while, only suitable Option is Option A.

P=600 W V= 220 V 1) I=P/V = 600 W / 220V = 2.7 A. 2) R= V/ I = 220/2.7 = 80 ohm.

tq

then what is the answer

3. If W is the maximum weight. Then,= W = 2T cos 60= W = 2 * 20 * 1 / 2 = 20 N.

The time of flight is dependent on the vertical component of the velocity of the projectile only.

The vertical component of the projectile velocity here is,

vy= u sinθ = 20 sin37 = 12 m/s

And, time flight is given by, t = 2vy/g = 2 × 12/10 = 2.4 s

An air gap is the gap of air provided inside electronic devices like in a capacitor or transformer to limit the short circuit current. The resistance of an air gap is nearly equal to infinity.

option A constant velocity is the answer.

The permittivity of free space (a vacuum) is a physical constant equal to approximately 8.85 x 10-12farad per meter(F/m)

It's unit isC²N^-1M^-−2( coulomb squared per Newton per square meter).

The answer is option B.

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475 joule i think is correct answer

At maximum heightvelocity = uCosθu/2 = uCosθθ = 60°

R = u² Sin(2θ) / g= u² Sin(2 × 60°) / g= u²√3 / (2g)

Range on horizontal plane is u²√3 / (2g)

The relationship between frequency and angular velocity is

w=2πF rad/sec

where w= angular velocity in rad/sec

F= frequency in HZ

Therefore w=2π*50

w=100π rad/sec

The relationship between frequency and angular velocity is w=2πF rad/sec

where w= angular velocity in rad/secF= frequency in HZ

Therefore, w=2π*50w=100π rad/sec

acyclotron is a device which is used to accelerate charged particles to higher energies.

PRINCIPLE: when a charge q moves normal to a magentic field it experiences magnetic lorentz force due to which it moves in circular path .

when a charged particle of mass ' m' and charge q is accelerated towards the Dee having -ve polarity at that instant and normal magnetic field produces magnetic lorentz force which provides centripetal force for the electron to move in a circular path of radius 'r' .By the time the particle reaches the gap the polarity changes thus the particle is again accelerated towards the Dee having -ve polarity at that instant. thus the particle moves in spiral path increasing the radius and velocity.we it reaches the edge the particle is taken out with the help of a deflector plate

It is an apparatus in which charged atomic and subatomic particles are accelerated by an alternating electric field while following an outward spiral or circular path in a magnetic field.

consider theeta to be 'q' here

we know that the range of two projectiles projected at different angles is same when one of the projectile is projected at angle q and the other at ( 90- q )

so heigh of projectile 1 = u2sin2q/2g

and height of the other projectile = u2sin2(90-q)/2g = u2cos2q/2g (since sin(90-q) = cosq )

so add the heights of both the projectiles

u2/2g ( sin2q + cos2q) = u2/2g ( since cos2q + sin2q = 1 )

so option number two is correct

The cyclotrone frequency is the frequency of charged particle movin perpendicular to the direction of magnetic field B

cyclotron frequency or gyrofrequncy is the frequency of a charged particle moving perpendicular to the direction of a uniform magnetic field B.since the motion is always circular the cyclotron frequency is given by equality of centripetal force and magnetic lorentz force.

mvsquare/r

Theequationfor thecyclotron frequencyis. f = q*B/(2* m) f is thecyclotron frequency.

100000 to 2000000 Hz hota hai

A cyclotron frequency or gyrofrequency is the frequency of charged particle moving perpendicular to the direction of uniform magnetic field B.

here in the image is virtual as it is on the left side on the lensthe image is Erect as it above the principal axis

Plane mirror: Virtual and erect image is always form and will always be of same size. Convex mirror: Always form virtual and erect image but the size of image is always smaller than size of object. Concave mirror: when the object is anywhere from infinity tofocusthe image so form will be real and inverted.

Concave lens forms image behind the mirror , thus producing a Virtual and Upright image.

A mirror is an object that reflects light in such a way that, for incident light in some range of wavelengths, the reflected light preserves many or most of the detailed physical characteristics of the original light, called specular reflection.

Cyclotronis a device used to accelerate charged particles to high energies. It was devised by Lawrence.Cyclotronworks on the principle that a charged particle moving normal to a magnetic field experiences magnetic lorentz force due to which the particle moves in a circular path.

the product o the product of two numbers is 25 3.1 34 if one of the number is 12.6 find the others number

the product of two numbers is 25 3.1 34 if one of the number is 12.6 find the other number

At finite distance from the mirror

At infinity Distance from mirror

sorry couldn't understand

SUBRAMANIYAM CHANDRASEKAR had concluded that, after converting all of their hydrogen to helium stars lose energy and contract under the influence of their own gravity. These stars, known as white dwarf stars, contract to about the size of Earth, and the electrons and nuclei of their constituent atoms are compressed to a state of extremely high density. Chandrasekhar determined what is known as the Chandrasekhar limit—that a star having a mass more than 1.44 times that of the Sun does not form a white dwarf but instead continues to collapse, blows off its gaseous envelope in a supernova explosion, and becomes a neutron star. An even more massive star continues to collapse and becomes a black hole. These calculations contributed to the eventual understanding of supernovas, neutron stars, and black holes.

He did important work on energy transfer by radiation in stellar atmospheres and convention on the solar surface. He also attempted to develop the mathematical theory of black holes, describing his work inThe Mathematical Theory of Black Holes(1983).

thanks u

rate will be squared to the amount of volume change. and it will be faster also. so rate will be 4•4 = 16 times

option D