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A concave mirror is USED in torchlights. The light rays from a source placed on the FOCUS of aconcave mirror are reflected in such a WAY that the reflected rays are strong, straight and parallel.

Newton's Second Law of Motion.Newton's Second Law of Motion states that 'when an OBJECT is acted on by an outside force, the strength of the force EQUALS the MASS of the object times the resulting acceleration'. In other WORDS, the formula to use in calculating force is force = mass x acceleration.

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torque is VECTOR quantity.

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Hey here's your ANSWER HOPE it HELPS you please mark as BRAINIEST if it helps...............

When an unpllarized light passes from AIR to a transparent medium under a water surface or a metal surface . it will GET polarized

Given in the question :-

ROTATION of the wheel = 100 REVOLUTION / MIN or = 5/3 revolution/second.

Now ,

Total rev. = 10 revolution

Now we have to find = ?

We know the formula,

0 = (10/6)² - 2 × α × 10

0 = 100/36 - 20α

α = 5/36 rev/second²

or α = 2 π × (5/36)

α = 10π / 36 radian/second² .

Now, we have to moment of inertia of the wheel.

I = 1/2 (0.2² × 10)

I = 0.2 kg.m²

Since the force is F, Now torque

F = F.r

0.2 F

Now torque = I α

0.20 / (10 π /36)

= 2 π /36

0.2 F = 2 π /36

F = 2 π/7.2

F = 0.87 N

Hope it Helps :-)

Given in the question :-

Assume , Time = t second.

Init. velocity = 50 revolution / second.

Fin. velocity =

In case of first cyl.

ω' = 50 - 1 × t

ω' = 50 - t

In case of second cyl.

Initial speed = 0 and FINAL speed = ω'

put the value of ω'

50 - t = t × 1

t = 25 second.

Hope it Helps :-)

GIVEN in the question :-

Length l = 1 m

Mass m₁ = 2 kg

m₂ = 5 kg.

Now we know the formula

F₁ r₁ - F₂r₂ = m₁r₁² + m₂r₂²

Hence,

I = 7 × 0.25

I =1.75 kg.meter².

Torque about the PIVOT, i.e T = m₁r₁ + m₂r₂

T = 5 × 0.5 - 2 × 0.5

T = (1.5 × g) Nm

Therefore the ACCELERATION

α = (1.5 × g) / 1.75

α = (1.5 × 9.8)/ 1.75

α = 14.7 / 1.75

α = 8.4 rad/second²

Hope it Helps :-)

Hey dear here is your answer





VECTOR PRODUCT : the magnitude of vector product of two vectors is defined as the product of magnitudes of two vectors and sine ANGLE between them is called called as vector product


hope HELPS you

X ray is a EM WAVE used to STUDY CRYSTAL

Given,
The electromagnetic wave travels in VACUUM ALONG z-direction. then , electirc FIELD VECTOR and magnetic field vector will be in XY plane.

Frequency of the wave = 30 MHz
Converting into Hz, v = 30× 10^6 Hz.
speed of light , c = 3 × 10^8 m/s
Wavelength of the wave can be calculated using the following relation:
λ = c/v
⇒ λ = 3 × 10^8/30 × 10^6
⇒λ = 10 m

ANSWER:

C₆H₁₂O₆ → CH₅OH + CO₂

b) FE + O₂ → Fe₂O₃

c) NH₃ + Cl₂ → N₂H₄ + NH₄Cl

d) NA + H₂O → NAOH

THANKS for asking the question!

ANSWER::

USING law of CONSERVATION of MOMENTUM ,

m₁u₁ + m₂u₂ = m₁v(t) + m₂v'    (v' = speed of second particle during collision)

v' = (m₁/m₂)u₁ + u₂ - (m₁/m₂).v(t)

v' = (m₁/m₂)u₁ + u₂ - (m₁/m₂).{u₁ + (t/Δt)(v₁- u₁)}

v' = u₂ - (m₁/m₂).(t/Δt)(v₁- u₁)

Hope it HELPS!

it is because motion and rest can occur at the same time but for DIFFERENT OBSERVERS......suppose you and your friend are SITTING in a bus which is MOVING and i am sitting on a bench outside.for me you are in the STATE of motionbut for your friend sittinf next to you , you are in the state of rest.......that is why it is said that rest and motion are relative terms

The object will sink as the DENSITY of the object is GREATER than the density of the WATER,i.e. 2.5 g/cm³> 1g/cm³

The RADIATION that OCCURS by and ELECTROMAGNET is CALLED an ELECTROMAGNETIC radiation

(a) number of turns , N = 2000
current , I = 4 A
cross SECTION area , A = 1.6 × 10^-4 m²
we KNOW formula,
so, M = 2000 × 4 × 1.6 × 10^-4
M = 1.28 Am²

(b) force on the solenoid will be zero in uniform MAGNETIC FIELD.
so, torque
= 1.28 × 7.5 × 10^-2 T × sin30°
= 4.8 × 10^-2 Nm
the torque tends to align the solenoid in the direction of magnetic field.

(a) in PARAMAGNETIC, the tendency to disturb the ALIGNMENT of molecular DIPOLES with the external magnetising FIELD arising from random thermal motion is reduced at lower TEMPERATURE.

(b) in diamagnetics, the molecular dipole moments always align in the direction opposite to that of external magnetising field , inspite of the internal motion of atoms.

(c) As bismuth is diamagnetic in nature,bso the field in the toroid with bismuth core will be slightly less than when core is empty.

(d) No, the permeability of a ferromagnetic material is not independent of the magnetic field. it is more at higher fields.

(e) As the magnetic permeability of a ferromagnetic is much larger than unity. so the magnetic field lines are always nearly normal to the surface of a ferromagnet at every point.

(f) Yes, but for the maximum possible magnetisation of paramagnetic sample, impractically very high magnetising field are required.

It is about 35 DEGREE CELSIUS to 42 degree Celsius

So,if a car and a bike with the same kinetic energy are brought to rest by the application of brakes.

The break of the car has to APPLY GREATER FORCE than the break of the bike.

Because,the mass of the car is surely greater than the bike.That's why the bike gains more MOMENTUM than the car.

And more the momentum gained by the vehicle,the more the EFFORT is needed by it's brake,in order to stop that particular vehicle.

EXPLANATION:

uhhhhhuyuu the FOLLOWING STATEMENTS for your TIME

When object is PLACED between POLE and focus of concave MIRROR

8M between OBJECT and IMAGE

Real,erect, horizontally inverted (left to right & right to left) and clear EVEN and regular REFLECTION takes place to form an IMAGE in a PLANE MIRRORS.

Final ANSWER :

Steps:
1) Magnitude :


2) We KNOW by,
De-Brogie RELATION:


Hence, We got Wavelength of particle as :

Acceleration of the Vehicles = -1.7 m/s².

Mass of the Vehicles = 1500 kg.

USING the NEWTON's Second law of the MOTION,

Force = mass × acceleration.

∴ Force = 1500 × -1.7

⇒ Force = -2550 N.

Negative sign shows that the Force is acting in Opposite Direction.

Hence the force of 2500 N is acting in opposite direction.

HOPE it helps.

The THREE 30 ohm resistances are in series which equal to 90 ohm. Now this 90 ohm resistance is parallel to the 30 ohm resistance near B. If you USE the resistances in parallel formula you will GET your ans as 22.5 ohm

Isaac Newton's first law of motion, also KNOWN as the law of inertia, states that an OBJECT at rest will stay at rest and an object in motion will stay in motion with the same speed and direction unless acted upon by unbalanced force. In other words, if no force acts on an object it will MAINTAIN a constant velocity (for an object at rest that velocity is equal to zero). With the first law of motion, Newton established the existence of a frame of reference for which his other laws of motion are applicable, called the inertial frame of reference. An inertial frame of reference is ONE in which the observer is MOVING at constant velocity (which includes being stationary).

Dimensions of the Plank's CONSTANT = ML²T⁻² . T

= ML²T⁻¹

Dimensions of Moment of Inertia = ML²T°

∴ Ratio = ML²T⁻¹/ML²T°

= T⁻¹

which is the DIMENSION of frequency.

Hope it HELPS.

Answer:

From the given data since SECOND ball thrown when the first ball reaches maximum height, so let us consider 2 balls are thrown for every second.

When one reaches the maximum height therefore to reach the maximum height, TIME taken be 0.5 sec.  

The EQUATION of motion, v = u + at

At maximum height h the VELOCITY becomes zero,

Applying other equation of motion,

Now we know that u = 0.5 g as well as

On equating them both, we get,

It is POSSIBLE to ROW a boat un water but not PASS through a WOODEN fence its just because FRICTION.

HEY MATE! HERE IS YOUR ANSWER

THE PILLARS OF A BRIDGE HAVE A BROADER BASE THAT TOP BECAUSE IN THE BASE THERE IS MORE PRESSURE ON PILLARS BY WATER THAN THAT OF TOP AS THE PRESSURE INCREASES IN DENSE WATER.

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A LINE of variable length drawn from a FIXED origin to a cure

Sorry i don't KNOW 20(C) GRAPHIC REPRESENTATION.

Force = MASS × Acceleration

From the question we can get the acceleration.

Acceleration = change in velocity ÷ TIME

This equals to :

(60 - 40) / (5/1000)

20 / 0.005 = 4000m/s²

150/1000 = 0.15

F = 4000 × 0.15 = 600N

Listing out the Formula

Work Done = FORCE X Displacement

Force = MASS x Acceleration

Considering the displacement of this Sattelite

One COMPLETE circle = Displacement = 0

∴ Work Done by Gravity is Zero

Hope it helps

Potential energy of electric dipole is MAXIMUM when it makes 180 DEGREE with electic field and min. when angle between them is ZERO degree

I = 100MA = 100/1000 A = 0.1A
T = 5×60 = 300second

Q= It
Q= 0.1×300
Q= 30C

50 m/s.

The word uniform means that there is no change in the particular QUALITY, in this CASE the velocity. Since it moves with a velocity of 50m/s for 20 minutes at the instant where the time is 2 minutes it will still be MOVING with a velocity of 50m/s as for every moment in time till the 20 minute MARK the velocity will be 50m/s and the 2 minute mark falls within before the 20 minute mark. Similarily the velocity at the 1 minute, 3minute 5 minute 10 minute 15 minute 16.2 minute mark will all have a velocity of 50 m/s

RELATIVE Error in Length = α

Relative Error in TIME = β

% Error in the Acceleration due to gravity = % Error in Length + % Error in Time.

= 100α + 100 × 2β

= 100(α + 2β) %

HENCE, % Error in acceleration due to gravity is 100(α + 2β) %.

Hope it HELPS.

Hey MATE here's ur ANS ↓↓

※※※※※※※※※※※※※※※※※

Velocity can be defined as the Rate of MOTION with direction ALONG with its speed is CALLED velocity.

velocity=u+v/2

※※※※※※※※※※※※※※※※※

hope it helps u☺☺✌

Thanks for the question!

ANSWER::

Mass of the Bugghi , m₁ = 200 kg

Velocity of Bugghi , v₁ = 10 km/hr

Mass of BOY , m₂ = 2.5 kg

Velocity of boy , v₂ = 4 km/hr

If we TAKE Buggie and boy as SYSTEM then TOTAL momentum before the process of sitting will remain constant after the process of sitting.

m₁v₁ = m₂v₂ = (m₁+m₂) v

200 x 10 + 25 x 4 = (200+25) v

v = 2100/225 = 28/3 km/hr = 9.3 km/hr

Hope it helps!

Thanks for asking the QUESTION!

ANSWER::

The block EXPLODED due to its internal energy so , the net external force during this process is 0 .

Therefore , centre of mass will not change .

Let the body when exploded was at origin of co-ordinate system.

If the TWO parts of body having equal masses moving at a SPEED of 10 m/s in POSITIVE x-axis and positive y-axis direction respectively then,

√(10² + 10² + 2 x 10 x 10 cos 90°) = 10√2 m/s 45° with respect to positive x-axis

And if the centre of mass is at rest then the third part of the body which have equal mass with other two , will move in opposite direction (which is 135° with respect to x-axis) of the resultant at the same velocity.

Hope it helps!

The MOTOR which is RUN by ELECTRICITY