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We KNOW that AVERAGE speed=TOTAL DISTANCE traveled/time taken.
now distance=30+30=60km.
and TIMES t=distance/speed.
so t1=30/40=3/4hours.
and t2=30/20=3/2hours.
so total time=t1+t2=3/2 + 3/4=9/4.
so average speed=60/(9/4)=240/9=26.66kmph

Time period for a stretched STRING

Explanation:

String particle for oscillating 20 ms LONG. String vibrating. A stretched thread is the fundamental vibratory mode such that the duration is twice the size of the string. A stretched string can be found in its resonant frequency through associated changes. The string tension DECREASES if a force is applied to one of the string ANCHOR points on the string axis. A string FIRMLY set at both ends. It primarily vibrates if this string is pulled in its middle.

Acceleration is the change in VELOCITY.
as velocity is a VECTOR QUANTITY, it will change if its magnitude, DIRECTION or both are changed.

in uniform CIRCULAR motion, the speed is constant but its direction is changing continuously as it is moving in circle.

as velocity is changing,it produces acceleration, that is called angular acceleration.

We should keep d object at MIRROR’s CENTRE as when object is at c image is also formed at c . Image will b of d SAMENESS size real ND inverted

The mass of the TRUCK will be the same.
no MATTER what the BIRDS are doing inside it.
when the birds STARTS flying, they will need to PRODUCE equal force on air to cancel gravity. so the truck will not lighten

That's because of LOW PRESSURE

Yes (for CONVEX ND concave MIRRORS which HV curved surface )

The IMAGE is BEYOND CENTRE of CURVATURE....

A, 8M ANS
B, 9.5m ans

inertial system. Word Origin. noun PHYSICS. a frame of REFERENCE in which a body REMAINS at rest or MOVES with CONSTANT linear velocity unless acted upon by forces: any frame of reference that moves with constant velocity relative to an inertial system is itself an inertial system.

Given u=0m/S
then

hence distance TRAVELLED in next 5 sec
= Total distance in 10sec-total distance in first FIVE second
4x-x=3X
hence 3x is distance travelled

Forces are the way that energy is transferred from one object to ANOTHER object when they INTERACT, but forces are not energy itself.

gravity is a force that PROVIDE a way to TRANSFORM the energy from different states.
but its not energy itself

Light choose a short PATH for it to travel to its destination. This is known as Fermat's principle. When light is incident on reflecting surface the path of incidence is the shortest path so the light select a path with the shortest DISTANCE to reflect back MAKING the angle of REFLECTION equal to angle of incidence.

· Yes we can by USING a CONCAVE mirror which converges LIGHT RAYS as it focuses parallel SUN rays at the focal point of  ................

The image formed by a plane mirror is just a copy of the object, called virtual image,
we SEE that virtual image laterally INVERTED as the image of the parts of object FORMS correspondingly which not always SEEMS SIMILAR to the observer example in the picture
the given two triangles are corresponding (look alike) but laterally inverted for the observer

Hey what's up...
I am here for ur HELP...
Here, X=Copper (CU)
According to statement On heating Cu with oxygen(in air) I. e. O2 it will FORM CuO copper oxide. 2Cu+O2——>2CuO
As shiny brown ELEMENT is Copper. it will TURN to copper oxide which is black in color on reacting with air....
Always be there for ur help....

The force exerted by each person is EQUAL, but they are pushing in opposite DIRECTIONS, in this case together. It would look SOMETHING like this. Because the force that each of you is EXERTING is equal, the two forces cancel each other out and the resulting forceis zero.

please mark it as brainlist

Hay fred. Please 20MIN RUKO m isi SOLVE krta HU?

F= mv

F= mv-mu/t

F=m(v-u/t)

F=ma

ANSWER:

Explanation:

The TERMINAL which is BLACK in colour is POSITIVE and that which is red is negative

Magnetic FIELD is PRODUCED as a result of CHNGE in current as DC current is CONTINUOUS through out therefore, there is no magnetic field AROUND conductor

Actually PHOTONS doesn't accelerate to light SPEED.
photons are not a ball LIKE particles .these can act as PARTICLE and wave at the Same TIME.
these have speed of light from the time these are created.

HEY DEAR YOUR ANSWER IS HERE
From the crossed chords PROPERTY, h(2R-h) = X2 
but 2R>> h therefore 2h = x2 and so h = x2/2R (equation 1) 
now x = AK which is almost the arcAB = vt (equation 2) 
 
Combining 1 and 2, h = (vt)2/2R (equation 3) 
h is the vertical FALL and so using s = 1/2 at2 = h (equation 4) 
 
Then from (3) and (4) 1/2at2 = (vt)2/2R leading to a = v2/R 
Using F = ma then F = mv2/R

Hey mate!!

FULL FORM of DNA is deoxyribo nucleic ACID

i THINK 1.65 + 4/3..........

HEY DEAR YOUR ANSWER IS HERE
Where P is its LINEAR momentum and ris its distance from its axis of rotation. ... Momentum can be defined as the product of mass and velocity of abody. It is a vector quantity. Themomentum of a body depends UPON the FOLLOWING FACTORS : (i) Mass of a body.......

FULL FORM of icoInitial COIN OFFERING

The total distance it needs to cross the bridge is the LENGTH of bridge and the length of TRAIN itself = 400+200 = 600m

Given Speed = 36km/hr = 36*5/18 m/s = 10m/s

So it takes Time= distance/speed
=600m/10ms^-1
= 60S or 1min

A)2 NAOH + H₂SO₄ → Na₂SO₄ + 2H2O
b) HG (NO₃) +2 KI → Hg I₂ + 2KNO₃
c) 2H₂+ O₂ → 2H₂O
d) 2KClO₃ →2 KCL + 3O₂
e) C₃H₈ + 10O → 3CO₂ +4 H₂O

In displacement reaction, one ELEMENT from its SALT isdisplaced by a more REACTIVE element e.g. in followingexample, Cu is displaced by Zn from CuSO4 because Zn is more reactive. In double displacement reaction, exchange ofions takes place between two reactants to FORM new products.

Final Answer : 0.0 m

1)
Assuming Both poles(GF & HC) are of equal LENGTH = 50 m .
ALSO, There is no disturbance along the length of cable.

2) We have,
AB = DF = EC = 10m
Therefore,
HE = GD = 40 m

Also, A is MID :
So, arc(AG) = arc(GH) = 40m

3) Suppose, Initially cable mid -point A coincides D which is of length 40m.
=> Then, slowly we extend /bring A to origin, then it's length must increase from 40m but it remains same.
=> There is no moment of point A from D.
Same happens with point E.
=> A, E, D coincides
=> Distance between poles is 0.0m ,in a nut both poles TOUCH each other.


Hence, Distance between poles is

DISTANCE from d CONDUCTOR .

CURRENT PASSING through it

For FRICTION..........

Because its a very good conductor of ELECTRICITY so if we apply WATER to control electrical FIRES then we can GOT hurt by ELECTRI shok....

Newton's first law says that if a object which is in motion stays in motion unless external force is APPLIED .EXAMPLE- when I rolea BALL it moves countinously unless and until I STOP it or stops by friction
Even when a object at REST remains at rest unless external force is applied.Example-A ball kept at rest remains at rest unless until u move it

a) Mass = 50 kg

Force=80 N

Force = mass * ACCELERATION

Force/mass = acceleration

80/50 = acceleration

acceleration = 1.6 m/s

B) mass = 1/2 of ORIGINAL

m = 1/2 * 50 = 25

new m = 25

f/m = a

80/25 = a

a = 3.2 m/s

For example : if a BODY moves in a EQUAL INTERVAL of TIME

Heat energy required to convert 1GM of ice to water is 80 CAL or 336 JOULES

The temperature of reverse change from liquid to SOLID is called the freezing point or crystallization point . For most SUBSTANCES freezing points and melting points are equal. For ICE the melting point is 0 degree celsius.

As in winter temperature lowers . Molecules stop VIBRATING hence decreasing d molecular idatnce betwenn DEM Nd GET closely packed hence get concverted into partially SOLID form