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Answer:

250 N

Explanation:

m= 20 kg   s=5m  t=2s

T-mg = ma ( by free BODY DIAGRAM)

T =ma + mg

=m(a+g)

s= UT + 1/2 at^2

5= (0*2) + 1/2 * a* 4

a= 5/2 = 2.5

T = 20 ( 2.5 + 10) taking g= 10

T = 20 * 12.5 = 250 N

ANSWER:

i HOPE this is CLEAR. it is CORRECT or not

AMPERE’s LAW Formula

∮B⃗ dl→=μ0I

ANSWER:

I have not RECEIVED QUESTIONS PROPERLY

Answer:

The TOTAL DISTANCE traveled= 625+250

                                             =875m

Explanation:

LET us first calculate the velocity ACHIEVED by the car at the end of 10s

v=u+at

as u=0 v=50m/s

distance traveled at the end of first 10 sec= s= at²÷2= 5×100÷2= 250m

Time TAKEN for the car to go to rest that is v=0, u=50 a=-2

v=u+at

t=u÷a=25s

Distance travelled= 2×a×s =v²-u²

2×2×s=2500

s=2500÷4

s=625

The total distance traveled= 625+250

                                             =875m

Answer:a) YES I justify Rahul's disagreement

As we know that velocity is a vector quantity i.e. it has both magnitude and direction. THOUGH the magnitude of velocity is constant but in a CIRCULAR motion, the direction of motion continuously changes. Therefore we cannot say that the velocity is constant.

b) Yes, according to me Gitika's disagreement is equally justified. The displacement is the shortest distance between the INITIAL point of motion/observation and the final point of motion/observation. They travelled to the same point from where they started therefore their displacement MUST be 0

Explanation:

Device used to measure the SPEED of a car is SPEEDOMETER.

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EXPLANATION:

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ANSWER:

The FORMULA in GETTING the energy OHM's LAW is V = IR.

ANSWER:

EXPLANATION:

Here's your answer in the PIC

Which type of space communication have maximum range of transmission

Answer

SATELLITE is the space communication that have maximum range of transmission

With HELP of satellite we WATCH TV programmes , news etc ,... It is an artificially made satellite

ANSWER:

EXPLANATION:

Here's your answer in the PIC

He REACHES by TRAVEL METRO TRAIN

ANSWER:

The SHORTER the WAVELENGTH, the more is the SCATTERING

The FIRST Law of THERMODYNAMICS. The first law of thermodynamics, also known as Law of CONSERVATION of Energy, states that energy can neither be created nor destroyed; energy can only be TRANSFERRED or changed from one FORM to another. In other words, energy cannot be created or destroyed.

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ANSWER:

EXPLANATION: 10m/s * 10= 100

Answer:

Any motion that repeats itself at regular interval of time is called periodic motion.

 EXAMPLES: Motion of the pendulum of a clock, motion of planets AROUND the Sun, etc.

A to and fro or back and FORTH motion of a body along the same path, without any CHANGE in shape of the body, is called an oscillatory motion.

Examples: Motion of a swing or pendulum, motion of the needle of a sewing machine moving up and down, etc.

All oscillatory motions are periodic but  all periodic motions are NOT oscillatory.

For example, motion of a planet around the Sun is periodic but not oscillatory.

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Answer:

permanent MAGNET has more RETENTIVITY by SOFT IRON does not have

ANSWER:

ax+bx2

This is the answer

ANSWER:

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Explanation:

the SPEED of LIGHT in ACID is

2.11×108m/s.

Answer:

correct answer is the option b ALONG X AXIS

ANSWER:

u=18km/h

18×5/18

=5m/s

v=36km/h

36×5/18

=10m/s

t=3second

acceleration=10-5/3=5/3

distance=36-18=18km

Answer: 24cm

Explanation:

Let  the representation of rays after reflecting from  convex lens.  Here red lines shows IMAGINARY lines.

In this case,

Distance of object from the lens (u) = -20 CM.

Distance of of IMAGE from the lens (v) = ?

Focus of this lens (F) = 40  cm.

For convex lens:-

By using lens formula,

1/f = 1/v - 1/u

1/40 = 1/v + 1/20

1/40 - 1/20 = 1/v

1/40 - 2/40 = 1/v

-1/40 = 1/v

v = -40 cm.

Here NEGATIVE sings show that image formed is 40 cm far from the optic centre in the opposite direction of ray or left side of lens(as per given arrangement). Basically Image is imaginary.

Now, This imaginary image will work as  object for the concave lens.

For concave lens:-

u = -(40 + 20)  = -60 cm

v = ?

f = -40 cm

By using lens formula,

1/f = 1/v - 1/u

-1/40 = 1/v + 1/60

-1/40 - 1/60 = 1/v

-3/120 - 2/160 = 1/v

-5/120 = 1/v

v = -24 cm  

Answer: 1/2 m* V square

Explanation: WORK done is EQUALL to change in KINETIC energy

So, change in kinetic energy is EQUAL to m * (v square) divided by 2

Answer:

HIVES what......

....

..

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Answer:

30km/h

= 30×1000/1×60×60 m/s

=25/3 m/s

45km/h

=45×1000/1×60×60 m/s

=25/2 m/s

First DISTANCE= 25M in 3s

Second Distance= 25m in 2s

Avg. SPEED= TOTAL s/total t

= 25+25/3+2 m/s

=50/5 m/s

=10 m/s

Answer:

EXPLANATION:

When a OBJECT moving with CONSTANT speed then ACCELERATION will 0.

When object is at race then it will ALSO 0

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Answer:

EXPLANATION:

Resistivity is the RESISTANCE of a material of area of cross-section PER UNIT length

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ANSWER:

EVERY action has an equal and OPPOSITE reaction

<P>ANSWER:

p = 25w

V = 200v

p = v * i

25 = 200 * i

25/200 = i

1/8 = i

ANSWER:

EXPLANATION:

Which QUESTION

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EXPLANATION:

u=80×5/18

u=200/9

v=60×5/18

=50/3

deceleration=(200/9-50/3)/5

=50/9×5

10/9

1.09m/s²

Answer:

5m/s^2

Explanation:

Initial Velocity = 0 m/s

FINAL Velocity = 20 m/s

Time = 4 sec

Acceleration = (Final velocity- Initial velocity)/Time

= (20-0)/4

= 20/4

= 5 m/s^2

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Explanation:

let US ASSUME ,(u=vel) g=10 and A is the angle

time to REACH HIGHEST point is=usinA/g

usinA/g=1.25

as given u=25m/s

25sinA=12.5

sinA=1/2

angle A=60°

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ANSWER:

it DEPENDS UPON with MASS

ANSWER:

A LOT

Explanation:

Explanation:

81

17+15+13+11+9+7+5+3+1

Answer:

Explanation:

The unit of PLANKS constant is joule/second not any THING ELSE

Once check it out

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ANSWER:

STARS APPEARS from EAST to WEST

Answer:

because of the third law of MOTION that is

action and REACTION are equal and OPPOSITE

ANSWER:

JOULE

Explanation:

Joule is the UNIT of PLANK CONSTANT. ....

ANSWER:

There is no NEED WAY to GET the INFORMATION to

Answer:

HEAT energy is needed to convert solidinto a liquid because heat energyincreases the kinetic energy of the particles. ... So it chenge into a liquid state. The heat energy that it used to change 1 KG of solid into liquid at ATMOSPHERIC pressure and at itsmelting point is called the latent heatof fusion.

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ANSWER:

the PRODUCT of mass and velocity is called as momentum.

SI UNIT = KG ms–²

factor

are mass and velocity

Explanation:

Day LENGTH varies with the time of YEAR and the latitude at which you are SITUATED. Because of the earth's tilt, areas above the ARCTIC Circle RECEIVE 24 hours of sunlighteach summer, but 24 hours of darkness eachwinter. Don't let the long cold winters that most people associate with the arctic fool you.

Answer:

Explanation:

According to ohms law V(voltage)is DIRECTOY proportional to I current

V=IR is the ohms law

Example can be ANYTHING TAKING values of any two VARIABLE