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ong>

0.12s

0.08s

0.04s

12s

ANSWER :

A

SOLUTION :

Velocity by which the BALL hits the bat

v1=2gh1−−−−√=2×10×5−−−−−−−−−√ or v→1=+10m/s=10m/s .

Velocity of rebound

v2=2gh1−−−−√=2×10×20−−−−−−−−−√=20m/s or v→2=−20m/s .

F=mdvdt=m(v→2−v→1)dt=0.4(−20−10)dt=100N.

by solveing, dt=0.012 sec.

ong>ANSWER:

The ROCKET operates on the PRINCIPLE of conservation of momentum.

We know magnification=

height of the image

height of the object

Also, magnification=

object DISTANCE

−image distance

−

U

V

=

h

0

h

i

=

2

6

=3

−V=3U

From,

f

1

=

V

1

−

U

1

10

−1

=

−3U

1

+

U

1

10

−1

=

3U

2

⟹−10=

2

3U

⟹U=

3

−20

=6.7m

answer was a the ten UNITS CONSUMED

>

show that for two complementary ANGLES of projection of a projectile thrown with thw same velocity. the horizontal RANGES are equal. The range is MAXIMUM when sin2θ is maximum. So, for two angles, θ and 90 – θ the range of the projectile will be same.

Your few EXPLANATION is in the picture

FORCE is directly proportional to ACCELERATION

F = ma

ong>Answer:

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Explanation:

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ong>ANSWER:

One NEWTON is the force NEEDED to accelerate one KILOGRAM of mass at the rate of one metre per second squared in the direction of the applied force.

Explanation:

hope it's HELPFUL to you

ong>Answer:

rolling frictin is less COZ small amoutof area come incintct with SURFACE

>

We know that at the axis of a CURRENT carrying coil at distance x from the center , magnetic field B is given by-

B

1

=

2(R

2

+x

2

)

3

/2

μ

o

IR

2

And B=

2R

μ

o

I

B

1

=

8

B

2(R

2

+x

2

)

3

/2

μ

o

IR

2

=

16R

μ

o

I

⟹8R

3

=(R

2

+x

2

)

3/2

⟹2R=(R

2

+x

2

)

1/2

⟹4R

2

=R

2

+x

2

⟹x

2

=3R

2

⟹x=R

3

Cardboard is the odd ONE .

MERCURY is your answer

ong>ANSWER:

NEWTON

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inertial forces

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ong>Answer:

If the DISPLACEMENT of an object is proportional to the square of the time taken then the BODY is MOVING with uniformly ACCELERATED motion as it will follow Newton's second equation of motion for a particular initial velocity, which can be given by, s=ut+21at2.

Explanation:

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ong>EXPLANATION:

Force is a MEASURE of the change of MOMENTUM over time. It can be written as F = mass x change in velocity / time. In practical TERMS, the momentum of an object increases when a force is acting upon it, because the force is causing it to accelerate, and to have an increase in velocity.

ong>Answer:

Refrigeration in the simplest terms is cooling by REMOVING HEAT. Most of the heat transfer occurs because the refrigerant changes state. The liquid refrigerant in the EVAPORATOR absorbs its latent heat of VAPORIZATION, and in the process changes from a liquid to a vapour.

vsquare=usquare + 2as

vsquare-usquare=2as

b is the answer

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ong>ANSWER:

Hydrogen is the first element of the periodic table & often called protium. Its electronic configuration is [1s1]. Due to the PRESENCE of only one ELECTRON in its 1s shell, hydrogen EXHIBITS a dual behaviour, i.e., it resembles both alkali metals and halogens.

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/s and 20.6 m/s is the CORRECT ANSWER...

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ong>Answer:

FOCAL LENGTH of a mirror is defined as the distance between POLE and principal focus of the mirror.

ong>ANSWER:

rearview

EXPLANATION:

i hope you GOT UR answer

ong>Answer:

One example of TRAVELING at a high velocity with a low acceleration is when you are driving a motorcycle at the direction of the north with a TOP, constant SPEED of 290 km per hour WITHOUT changing the speed and direction.

ong>Answer:

it will become just a SIMPLE STONE and TERE will be no VALUE of this stone

ong>Answer:

1/9 times

Explanation:

As we know that FORCE is INVERSELY PROPORTIONAL to square of distance between masses of two OBJECTS.........THEREFORE 1/9 times will be the answer

ong>Explanation:

option 4 a - c = B+ d

........

(H) =-16t^2 +vt+h

Height FORMULA

ong>Answer:

If two forces act on an object in opposite directions, the net force is the difference between the two forces. In this CASE, the net force is ALWAYS greater than or equal to zero but less than either of the individual forces

Explanation:

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ong>Answer:

Zero

Explanation:

If there are no components of DISPLACEMENT in the same direction as force then the work DONE by the force is zero. However if there is displacement of the body in any direction such that a component of it may LIE in the same (or opposite) direction of force, then there is work done accordingly.

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ong>Answer:

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EXPLANATION:

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False

Explanation:

It's an irreversible change because once a TREE is GROWN up it can't change back into the small sapling.

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ANSWER: pressure gradient =pressure/distance ----- force/area*distance -----== M¹L¹T-²/L²*L === M¹L-²T-²!!!!!!

N VECTOR= nxicap+nyjcap+ nzkcap

ong>ANSWER:

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LET equation parabola y  

2

=4ax

Oc=5 cm

So, x−Cordinate of point A=5

Ab=20

AC=  

2

1

​  

×AB=10

A(5,10)

A Lie on the parabola it will satisfting the eqquation y  

2

=4×9×5

9=5

focus =(0,10)

=(5,0)

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Explanation:

It is also true that a free falling (no air resistance) object FALLS with an acceleration of 9.8 m/s2—but it's still just the gravitational field. It doesn't matter what object you put near the surface of the EARTH, the gravitational field due to the Earth is CONSTANT and pointing TOWARDS the center of the Earth.

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ong>EXPLANATION:

o.348

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ong>ANSWER:

energy STORED in inductor SYSTER power complaint minister and CURRENT also calculate impelsys

Answer 1

The battery ESTABLISHES an electric potential difference across the two ends of the external circuit and thus causes the charge to flow. The battery voltage is the numerical value of this electric potential difference.

Answer 2

An electric circuit includes a DEVICE that gives energy to the charged PARTICLES constituting the CURRENT, such as a battery or a generator; devices that use current, such as lamps, electric motors, or computers; and the connecting WIRES or transmission lines.

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ong>EXPLANATION:

OPTION 4 is right....... ...

al cells each have a centrosome and lysosomes, whereas plant cells do not. Plant cells have a cell wall, CHLOROPLASTS and other specialized plastids, and a LARGE CENTRAL vacuole, whereas ANIMAL cells do not.

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ong>ANSWER:

false

Explanation:

because the AVERAGE SPEED = total DISTANCE / total time period

Therefore it will only tell us about the speed about a particular time

HOPE YOU HAVE UNDERSTOOD

ong>Explanation:

Since the level of mercury in the barometer is DEPENDENT on the PRESSURE of the actual atmosphere, there must be no other factor that INHIBITS the ability of the mercury to RISE. High atmospheric pressure pushes the mercury up; low atmospheric pressure allows the mercury to DROP.