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Answer:

600 m, 66.67 m/s

Explanation:

Distance covered by train to cross the man = LENGTH of train = L

Distance = SPEED × Time

L = V × 9

V = L/9 ...(1)

Distance covered by train to completely pass the BRIDGE = L + 300 m

Distance = Speed × Time

L + 300 = V × 13½

L + 300 = V × 27/2

From equation (1)

L + 300 = L/9 × 27/2

L + 300 = 3L/2

L - 3L/2 = -300

-L/2 = -300

L = 600 m

Speed of train from equation (1) is

V = L/9

= 600 / 9

= 66.67 m/s

EXPLANATION:

Given : 750 P,220 V

To find : CURRENT (I)and Resistence (R)

Sol: P = V² ÷ R

750 = 220 x 220 ÷ R

750÷220 = 220 ÷ R

3.4090 = 220 ÷ R

3.4090 x 220 = R

749.98 = R

Therefore, R = 749.98Ω.

P = V x I

750 = 220 x I

750÷220 = I

3.4090 = I

Therefore, I is 3.4090 A.

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Answer:

1 m/s²

Explanation:

Total distance TRAVELLED by train to completely pass the platform = 150 m + 300 m = 450 m

Use equation of motion

a = (v² - u²) / (2S)

= (50² - 40²) / (2 × 450)

= 1 m/s²

ANSWER:

UPTHRUST = mv/t

= 20×1000 = 20000 N

1/100 of INITIAL mass = 20/100 kg/sec

therefore,

VELOCITY = 20000×100/20 = 100000 m/sec

Answer:

Due to heat in summer ,there will be expansion in wires

In summer any object slightly increases in dimensions like railway TRACKS ETC.

ANSWER:

here is your answer HOPE it HELP

ANSWER:

MASS ×volume

EXPLANATION:

then dimensions is kgms ^_1

YAHH........ OPTION.. 3.......is. CORRECT

ANSWER:

It will be 51 kg

hope you GET the answer

Answer:

F = mdv/dt

m = Ft/(v - u)

m = 10 * 20 / (225 - 50)

m = 200/175

m = 7/8 kg

Hope it helps

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Answer:

REACTION time is 25seconds

Explanation:

The reaction time will be given by the speed and the distance covered.

72 km/hr  = 72000m/ 60 x 60 s  =  20M/s

speed = 20m/s

if 20m is covered in 1s

then 5m will be covered in 1 x5/20 = 0.25s

Therefore his reaction time is 0.25 seconds.

ANSWER:

-22.23

Explanation:

f1=-40cm

f2=-50cm

1/ F= -1/f1-1/f2

-1/40-1/50

=-9/200

F=-200/9=-22.23

ANSWER:

EXPLANATION:

F=25

25=ma

25=10a

a=2.5m/s^2

V=u+at

10=5+2.5t

t=2sec

SPEED or velocity(v) = 10m/s

initial velocity(U)= 0m/s

ACCELERATION(a)= ?

formula for acceleration,

a = v–u/t

= a = 10 – 0/10

= a = 1m/s

THEREFORE, acceleration of the car is 1m/s

10

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Answer:

A force of 3N ACTS at 90° to a force of 4N. What is the MAGNITUDE and direction of their resultant? If two forces of 3N and 4N are acting on a BODY making an ANGLE of 90 with each other.

ANSWER:

12 KILO JOULES is the CORRECT answer for this QUESTION and answer is the correct

Answer:

Explanation:

=> Here, we can calculate the minimum COEFFICIENT of friction by using the below formula:

F = μN

Where,

F = the resistive horizontal force of friction

μ = coefficient of friction for the two surfaces

N = the normal or perpendicular force pushing the two objects together

=> Thus, net Horizontal force on the wedge, F:

F - mgsinፀcosፀ = m(a)  [but m(a)= 0]

F - mgsinፀcosፀ = 0

F = mgsinፀcosፀ

F = mg sin 45° COS 45°               [sin 45° = 1/√2, cos 45° = 1/√2]

F = mg * 1/√2 * 1/√2                    [1/√2 * 1/√2 = 1/2]

F = mg/2

Now, the normal or  perpendicular force  N:

N = mgcos²ፀ + 2mg

= mgcos(45°)²+ 2mg                   [cos(45°)² = 1/2]

= mg/2 + 2mg

= mg + 4mg / 2

= 5MG / 2

=> Thus, the minimum coefficient of friction, μ:

F = μN

μ = F/N

= mg / 2 / 5mg / 2

= mg * 2 / 2 * 5mg

= 1/5

= 0.2

Answer:

Explanation:

SPEED1= 10km/hr

time1= 2hr

thus, DISTANCE1= speed1/time1= 10/2 = 5km

speed2= 13km/hr

time2= 1hr

thus, distance2= speed2/time2= 13/1 = 13km

average speed=total distance/ total TIME

= (distance1+ distance2)/ (time1+time2)

= (5+13)/ (2+1)

=18/3

=6km/hr

thus the avg speed of he car is 6km/hr

hope it helps you...

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Answer:

Force equals mass times acceleration. Well, let's write it a different WAY. Acceleration is DIRECTLY proportional to force and inversely proportional to mass. This MEANS that if you GET pushed, the harder you are pushed, the faster you'll move (accelerate).

EXPLANATION:

v=u+ at

u=80km/ HR= 22.22m/s

v=44km/hr=12.22m/s

t=15s

-a=?

a=v-u/t

a=22.22-12.22/15

a=0.66m/s2

-a= 0.66 m/s2

ANSWER:

-1.7 m/s

Explanation:

USE equation of motion

S = ut + 0.5at²

In first 2 seconds

2 = 2u + 0.5a(2)²

2 = 2u + 2a

1 = u + a .....(1)

In first 4 seconds

2.8 = 4u + 0.5a(4)²

2.8 = 4u + 8a

0.7 = u + 2a .....(2)

Subtract (2) from (1)

1 - 0.7 = u + a - u - 2a

0.3 = -a

a = -0.3 m/s²

From equation (1)

1 = u + a

1 = u - 0.3

u = 1.3 m/s

Speed at the END of 10th second

v = u + at

= 1.3 + (-0.3 × 10)

= -1.7 m/s

Answer:

A solenoid is a type of electromagnet the purpose of which is to generate a controlled magnetic field. If the purpose of the solenoid is instead to IMPEDE changes in the electric CURRENT, a solenoid can be more specifically CLASSIFIED as an inductor rather than an electromagnet.

application of a solenoid varies in many different types of industries. It can be used in a simple locking device, medical clamping EQUIPMENT, an automotive gear box, and an air conditioning unit.

Hope it Helps You ❣️

Explanation:

In physics and MATHEMATICS, the dimension of a mathematical SPACE (or object) is informally DEFINED as the minimum NUMBER of coordinates NEEDED to specify any point within it.

CHECK it on you TUBE

..........

FOLLOW me

Explanation:

you ALSO need to provide the ACCELERATION of the BLOCK SINCE the power also depends on how fast the block is moving

EXPLANATION:

Numerous well-known QUANTITIES, such as π, e, and φ, are dimensionless. By contrast, examples of quantities with dimensions are LENGTH, time, and speed, which are MEASURED in dimensional units, such as metre, second and metre/second.

Answer:

100n/m = 1 KG then it is 4 kg

EXPLANATION:

Dimensions

Errors

Significant figures

Types of Errors

Dimensional Analysis

Units MEASUREMENTS

ANSWER:

Option (2)

EXPLANATION:

Mass of A = 120 kg

Mass of B = 85 kg

Mass of radio box = 5 kg

B throws the box towards A with velocity 2 m/s

Initial velocity of B = 0

Let final velocity of B is

Therefore, from conservation of linear momentum

                                            = 11.8 cm/s

Again from conservation of linear momentum, if the velocity of A after receiving the radio box is then

                                              = 8 cm/s

ANSWER:

ALTERNATIVE connection plug

Explanation:

it is used in our HOMES where the current from the main source is indirectly passed through the house to AVOID more DAMAGE during short circuits

ANS - mv²

Explaination—

Centripetal force = GRAVITATIONAL force

mv²/r = GMm/r²

=> mv² = GMm/r. <--------KINETIC ENERGY

Therefore mv² is the kinetic energy.

@BeardoBoy

ANSWER:

on PRINCIPAL of AERODYNAMICS

i HOPE you UNDERSTAND.

ANSWER:

180 DEGREE

Explanation:

180 degree is the answer

Answer:

17/4

Explanation:

R1 =2+2+2=6 (SERIES)

1/ R2=1/6+1/6=2/6=1/3 (PARALLEL)

R2=3

now

R3=3+3+3=9 (series)

1/R4=1/9+1/9=2/9 parallel

R4=9/2

Rfinal=9/2+2+2=9/2+4=17/2. series

Explanation:

Let Units of FORCE, LENGTH and Time are F, L and T ... density = Mass / Volume = (Force/Acceleration)/Volume . ... can a quantity has dimensions but STILL has no units.

ANSWER:

RADIAN.................

Answer:

1 WATT is the POWER of an AGENT , whicb does WORK at the rate of 1 joule per SECOND

Answer:

1 PICO COULOMB=1×10^-12 coulomb

Answer:

Explanation:

Archimedes principle

Archimedes' principle STATES that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is EQUAL to the weight of the fluid that the body displaces and ACTS in the upward direction at the CENTER of mass of the displaced fluid.

Buoyancy

Buoyancy is made by the difference in PRESSURE put on the object by the Fluid or air that the object is in.

EXPLANATION:

sin X/ COS x= TAN x

d/ dx(TANX)=sec2x

Answer:

Nonmetals. Elements that tend to gain electrons to FORM anions during CHEMICAL reactions are called non-metals. These are electronegative elements with high ionization ENERGIES. They are non-lustrous, brittle and poor conductors of HEAT and ELECTRICITY (except graphite).

A PROJECTILE is an OBJECT that FOLLOWS HYPERBOLA MOTION.

Answer:

MEDIUM

Explanation:

medium is means to take no PERMISSION to other.

Example: the UV rays (Ultra VIOLET rays) is not required any medium to COME on EARTH.

Answer:

electric motor is an MACHINE which convert electric energy into mechanical energy.

it is on PRINCIPAL of FLEMING left& right HAND rules

Question :

CALCULATE the OXIDATION number of Cl in NaClO.

Answer:

+ 1 .

Explanation:

Let :

O.N. of Cl be Z in NaClO.

We know :

O.N. of NA = + 1

O.N. of O = - 1 .

Here net charge on compound in ZERO.

= > ( 1 ) + ( z ) + ( -2 ) = 0

= > z - 2 + 1 = 0

= > z - 1 = 0

= > z =  + 1

Therefore , O.N. of Cl in NaClO is + 1 .

Read more :

1. Calculate the oxidation number of Mn in MnO₄⁻ .

brainly.in/question/4986398

2. Calculate the oxidation number of P in K₄P₂O₇ .

brainly.in/question/4974210

<P>Given,

P. d = 220 V

I = 5A

Finding RESISTANCE, we GET :-

R = V/I

R = 44 ohm

Let the no.of resistors be x

R = 176/x

44 = 176/x

x = 4.

Hence, no. Of resistors = 4.

Hope it helps :)

Answer:

❤️❤️The average power (often SIMPLY called "power" when the context makes it clear) is the average amount of work done or Energy TRANSFERRED per unit time. Fiber optic power meters are instruments that measure the average power of a continuous Light beam. They are used to test SIGNAL power in fiber optic networks.❤️❤️

Explanation:

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ANSWER:

21% answer EXPLANATION above

Explanation:

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