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Here is your ANSWER ...
WAVELENGTH = VELOCITY / frequency
hope it HELPS !!;

Here min WAVELENGTH means MAX energy so energy will be max at INFINITY so each case n2=infinite
For lyman-n1=1and balmer series-n1=2.so si the ratio will be 1/4.

A electric motor is a electric machine which CONVERT ELECTRICAL ENERGY into MECHANICAL energy

180+45/(2*60)_speed
45-180/60_acceleration

Solution:

There will be TWO cases.

CASE - 1

Let the velocity of the railroad car with RESPECT to earth is V after jump of left man.

0 = - mu + (M + m) VV = mu / (M + m) towards right.

CASE - 2

When man on right jumps , the velocity of it with respect to car is u.

0 = mu - Mv'v' = mu/Mv' is the change in velocity of platform when platform is taken as reference and we ASSUMED car to be at rest.

Therefore , net velocity towards left i.e. velocity of car with respect to earth = mv/M - mv/(M + m)= (MMU + m²v - Mmu) / M(M + m)= m²v / M(M + m)

Hope it helps!

Conservation of linear momentum expresses the FACT that a body or system of bodies in motion retains its TOTAL momentum the product of mass and VECTOR VELOCITY, UNLESS an external force is applied to it.

When the packet FALLS from the BALLOON it has an initial velocity of 5 m/s.

The ACCELERATION is the acceleration due to GRAVITY which is 10m/s²

S = 98m

We will use the following equation of motion :

V² = U² + 2gs

V² = 25 + 2 × 10 × 98

V² = 1985

V = 44.55 m/s

The Magnetic FIELD along the axis of a CIRCULAR loop.We derived an expression for the magnetic field at the CENTRE if a circular CURRENT loop of RADIUS R.

DC AMMETER reads instantaneous CURRENT where as ac ammeter reads RMS value

Which has MAGNITUDE and DIRECTIONS

HEYA!!!


HERE IS YOUR ANSWER,


=> Speed of TRAIN = 180 km/hr = 50 m/s.

=> Time TAKEN to stop the train = 5 sec.

=> Total mass = 2000 kg.

=> Retardation = (Speed)/(time)

=> 50/5

=> 10 m/s²

Now,

=> F = m × a

=> F = 2000 × 10

=> F = 20,000 N.


HOPE IT HELPS YOU,
THANK YOU.☺️

The main REASON to manufacture submarines with HARD thick metal SHEET is because under water PRESSURE is high, this pressure might crush any steel with less thickness. Hence, to deal with this pressure hard thick metal sheet are used.

So the ACCELERATION of any OBJECT you THROW UPWARDS is about 9.8 m/s^2downward.

Answer:

Explanation:

Given :-

u = - 25 cm

v = - 75 cm

To Find :-

f = ??

P = ??

Solution :-

Using, 1/v - 1/u = 1/f we get

⇒ 1/- 75 - 1/- 25 = 1/f

⇒ 1/- 75 + 1/25 = 1/f

⇒ 2/75 = 1/f

⇒ f = 75/2

⇒ f = 37.5 cm

Hence, the focal length is 37.5 cm.

Now, P = 100/37.5 cm

⇒ P = 2.6 D

Hence, the power of lens REQUIRED to enable him to read NEWS PAPER is 2.6 D.

Both have same VALUE =3/5
therefore ANSWER is 9/25

While REFRACTION........

The NET force ACTING on the table will be ZERO as in a force is equal to mass into acceleration and there is mass 9 KG and acceleration is zero so the net force will become zero

no. of MOLES=GIVEN mass/GMM of NITROGEN

0.5 moles =given mass/28

therefore mass=28*0.5=14 G

14 g is the ANSWER

47 degrees C = 320 K

1 g O2 * 1 mol / 32.00 grams = 0.03125 mol O2

Universal gas CONSTANT: R = 8.314 J / mol K.

8.314 J / mol K * 0.03125 mol * 320 K = 83.14 J.

This ANSWER assumes that KINETIC energy is zero when all the gas particles are infinitely FAR away from each other and that the gas is an ideal gas.

If the FORCE is APPLIED in the direction of MOTION then SPEED INCREASES

The ANSWER to this QUESTION is 2R

                         Note :

• f = focal length

• V = distance of image .

• u = distance of object .

Lens formula :

1 / f = 1 / v - 1 / u

Concave lens :

f = negative

u = negative

v =  negative

Convex lens

f = positive

u = negative

v = positive for real image ,

v = negative for virtual image .

The OPTICAL centre is CHOSEN as the origin of the COORDINATE system.

With respect to optical centre :

The PART which are above are positive, below negative.

The part which are right are positive while left is negative.

This is just like the normal x-axis and y-axis in the co-ordinate system .

Thanks for asking the question!

ANSWER::

Mass of first block , m₁ = 2 kg

Speed of block , v₁ = 2 m/s

Mass of SECOND block , m₂ = 2 kg

Let final velocity of second block = v₂

Using law of conservation of momentum ,

2 x 2 = (2+2) v

v = 1 m/s

Therefore ,

(a) Loss in Kinetic Energy in ELASTIC collision = (1/2) x 2 x 2² v - (1/2)(2+2) x 1²

= 4 - 2

= 2 J

(B) Actual loss = Maximum Loss / 2 = 2/2 = 1 J

(1/2) x 2 x 2² - (1/2) x 2 x v₁² + (1/2) x 2 x v₂² = 1

4 - (v₁² + v₂²) = 1

4 - [(1 + e²) x 4] / 2 = 1

2(1 + e²) = 3

1 + e² = 3/2

e² = 1/2

e = 1 / √2

Hope it helps!

Given in the question :-

Rotation of the WHEEL(INITIAL) = 600 RPM or = 10 revolution / second

Final velocity = 0

Time = 10 second

now we have to find = ?

We know the formula ,

PUT all the VALUES in the given formula

0 = 10 - α × 10

α = 1 revolution /second ²

Now the angular velocity at time change t = 5 sec.

ω'' = 10 - 1 × 5

ω'' = 5 revolution/second.

Hope it Helps :-)

Pascal's LAW or principle applies to pressure TRANSMISSION in fluids. The principle is applied primarily in the operation of hydraulics such as in car brakes and Falk lifts. Pascal's principle states that pressure in an incompressible FLUID contained in an in expansible VESSEL is transmitted equally in all direction.

REFER to attachment

PLEASE MARK as BRAIN LIEST

TRANSVERSE Waves- Displacement of the medium is perpendicular to the direction of PROPAGATION of the WAVE.

Longitudinal Waves-Displacement of the medium is PARALLEL to the direction of propagation of the wave.

HEYA MATE,

HERE IS UR ANSWER.

Thanks for asking this question.

The total time taken by Ball-1 from t-0 to the moment it REACHES ground be t-1 and Ball-2 be t-2

We need (t-1) - (t-2)

t-1

Upward phase, u = 10m/s a= -10m/s^2 v=0, time = v-u/a = -10/-10 = 1 second

Height attained during intial phase = ut + 1/2gt^2 = 10*1 + 1/2(-10)(1)^2 = 5m

Downward Phase, u = 0 height = 205 m,

==> 205m = 0 + 1/2(10)(t^2)

t= SQRT(41)

t-1 = 6.4031+1 = 7.4031

t-2

Height traveled = 200 m, u = 10m/s

==> 200 m = 10t + 1/2(10)(t^2)

5t^2+10t-200 = 0

t^2 + 2t - 40 = 0

t= [-2(+-)Sqrt(4–(4)(1)(-40))]/2 = [-1(+-)(1/2(Sqrt(164))] = -1 (+-) 12.8062/2 = 5.4031

Difference = 7.4031–5.4031 = 2 Seconds.

This big solution is offered as other solutions have already been given.

I HOPE IT HELPS U.

Pressure is the FORCE acting perpendicularly on a BODY PER unit area.

PRESSURE = FORCE (N ) / AREA ( m^2)

UNIT OF PRESSURE = Nm^2 or PASCAL.

Given,
R=36 CM
or f=-36/2=-18 cm (It is a concave mirror)
magnification, m=h' /h=3=-v/u
or v=-3u
Now, USING the mirror formula,
1/f=1/v + 1/u
-1/18=-1/3u + 1/u
or OBJECT DISTANCE, u=-12 cm

A candle has three different zones:

1. innermost zone ---- dark or black in colour
2. MIDDLE zone -------- luminous zone
3. outer most zone ------- Non luminous zone

• Luminous means bright and emits light
• The YELLOW colour REGION which is the bright part of the flame is middle zone of the candle.
• It is due to partial or incomplete COMBUSTION of FUEL

M=-v/u
0.16=-4/u
u=-4/0.16
u=25

Hey
Baking Soda is also know as sodium BICARBONATE or sodium HYDROGEN carbonate.
It has FORMULA Na HCO3.
Hope it HELPS :)

32^2/(400×9.8)=.2612

AvgF = m[ v(final) - v(initial) ]/∆t

w = angular velocity
w = 2π/T = V/R

T = time period of oscillation
T = 2πR/V

so ∆t = (2π/3)/(2π/T)
∆t = T/3
∆t = 6πR/V


to solve it in VECTOR form
let the x-axis is from centre to A
and y-axis is PERPENDICULAR to it from centre
and let the unit vector in the direction of x&y axis are " i&j " respectively


therefore
v(initial) = v j

v(final) = v [ cos30i - sin30j ]
v(final) = v [ √3i - j ]÷2


so
=> v(final) - v(initial)
=> v [ √3/2i - 3/2j ]


so
avgF = { mv[ √3i - 3j ]÷2 }/{ 6πR/v }
= mv²[ √3i - 3j ]÷[12πR]


and by taking its mode

= mv²/12πR×[ √(3+9) ]
= √12mv²/12πR
= mv²/2√3πR


I think I made some mistakes in SOLVING
because I'm not USING pen-paper
hope so you GET it that how to solve it
otherwise I have to solve it again


hope it helps you
@di

HEY DEAR HERE IS YOUR ANSWER ✌✌❤❤

The question STATES that 0.840 m is the distance travelled within the barrel. Therefore u = 0 m/s, v= 521 m/s. 
This means that a = (v² - u²)/2s. 
This is a reformat of v² = u²+ 2AS 
a = (521^2)/(2 x 0.840) 
a = 161.57 m/s²

HOPE IT HELPS U.
#BE BRAINLY.

The PHYSICAL QUANTITY is " MOMENTUM"....☺️☺️

ʜᴇʟʟᴏ ᴍᴀᴛᴇ!

Let the object at point A

As given, object covers WHOLE PARK in 40s

Now, 2 min 20s = 2*60s + 20s
= 140s

In 40s the object takes = 1 ROUND.
In 140s the object takes = 140/40 or 3.5 rounds.

Now, take 1 round from A, and similarly take 2 rounds more.

Now, take a HALF round and you will end you journey at B

So, displacement = diameter of circle
= 2r

DISTANCE = circumference

Circumference = 2πr

As body took 3.5 rounds so,

= 3.5 ( 2* 22/7 * r )
= 3.5 * 44/7 * r
= 0.5*44r or 22r

Now, ratio of displacement and distance

= 2r / 22r = 1/11 or 1 : 11

Hope it helps

The RESISTANCE of a and b are in the ratio 27:32.
See DESCRIPTIVE ANSWER in the PIC