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A body moving with uniform acceleration travels 84 metre in 6 seconds and 264 metre in 11 seconds. The initial velocity of the body is

Posted by Sudhanshu Baranwal (Apr 28, 2017 10:04 a.m.) (Question ID: 5052)

  • Answers:
  • Ans. Let Initial velocity of body = u m/s

    acceleration =  a m/s2

    According to 2nd equation of motion.

    {tex}84 = 6u + {1\over 2}a\times 36{/tex}                               [{tex}s= ut + {1\over 2}at^2{/tex}]

    => 84 = 6u+18a

    => 14 = u + 3a .............(1)

    Also

    {tex}264 = 11u + {1\over 2}a\times 121{/tex}

    => 528 = 22u + 121a           ...............(2)

    multiply eq(1) by 22 and subtract from (2), we get

    220 = 55a

    => a = 4, put value of in eq(1)

    14 = u + 12

    => u = 2m/s

    Answered by Naveen Sharma (Apr 28, 2017 12:14 p.m.)
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A force of 10 Newton acts on a body of mass 2 kilogram for 3 seconds, initially at rest. The velocity acquired by the body will be??

Posted by Sudhanshu Baranwal (Apr 28, 2017 10:03 a.m.) (Question ID: 5051)

  • Answers:
  • Solution: 

    Let initial velocity u = 0 

    let final velocity v = ?

    foce (f) = 10N

    Mass of body m = 2Kg

    Time t = 3s

    Acceleration a = {tex}{v-u\over t } = {v-0\over 3} = {v\over 3}{/tex}

    As we know

    f = ma

    => {tex}10 = 2\times {v\over 3}{/tex}

    => v = 15m/s

    Answered by Payal Singh (Apr 28, 2017 11:50 a.m.)
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A train first travels for 30 minute with a velocity 30 kilometre per hour and then for 40 minutes with a velocity of 40 kilometre per hour in the same direction. The average velocity of train is??

Plz define it also

Posted by Sudhanshu Baranwal (Apr 28, 2017 10:02 a.m.) (Question ID: 5050)

  • Answers:
  • Solution : D1 = Distance traveled in 30 minute with velocity 30km/h = 15km

    D2 = Distance traveled in 40 minute with velocity 40km/h = {tex}80\over 3{/tex}km

    Total distance = {tex}15 + {80\over 3} = {125\over 3}{/tex}Km

    Total time taken = 30+40 = 70m = {tex}{70\over 60} = {7\over 6}h{/tex}

    Average velocity = {tex}{Total\space distance \over time \space taken }= {125 \times 6\over 3\times 7}{/tex}

    =,{tex}{250\over 7 } = 35{5\over 7}Km/h{/tex}

    Answered by Payal Singh (Apr 28, 2017 12:01 p.m.)
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what is the job of mitochondria ? explain with a suitable example?

Posted by Amaan ali (Apr 23, 2017 1:13 p.m.) (Question ID: 5008)

  • Answers:
  • The main function of mitochondria is the oxidation of glucose to release energy in form of ATP. It is called as power house of the cell.

    Answered by RAJENDRA SINGH (Apr 23, 2017 8:50 p.m.)
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What is circular motion?

Posted by Kosturi Koiri (Apr 23, 2017 12:50 p.m.) (Question ID: 5007)

  • Answers:
  • when an object in moving in an circular direction 

    Answered by Amaan ali (Apr 23, 2017 1:14 p.m.)
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In which state of matter, particle motion is the maximum 

Posted by Ejaj Sk (Apr 22, 2017 10:46 p.m.) (Question ID: 4998)

  • Answers:
  • In Gaseous State the motin of particle is maximum

    Answered by Ankur Majumdar (Apr 23, 2017 9:30 a.m.)
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a boy runs for 10 min at a  uniform speed of 9km/h . at what speed should he run for the next 20 min.so that the average speed comes to 12km/h?

Posted by sai poreddiwar (Apr 20, 2017 9:21 a.m.) (Question ID: 4959)

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  • 6km/h

    Answered by Md Wasim (Apr 20, 2017 11:30 a.m.)
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the average speed of a bicycle,an athlete and car are18km/h  ,7m/s ,2km/min  respectively.which of three  is  fastest and which is the slowest?

Posted by sai poreddiwar (Apr 20, 2017 9:20 a.m.) (Question ID: 4958)

  • Answers:
  • i mean I am sorry there is correction

    BICYCLE = 5m/s

    and CAR = 33.3m/s

    Answered by Aashka Shah (Apr 20, 2017 3:39 p.m.)
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  • CAR is fastest &

    BICYCLE is slowest

    car=5m/s

    athlete=7m/s

    car=33.3m/s

    Answered by Aashka Shah (Apr 20, 2017 11:54 a.m.)
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Give an example each for velocity and average velocity. Please don't explain the term or formula. I want examples

 

Posted by Latha Gopal (Apr 19, 2017 12:55 a.m.) (Question ID: 4944)

  • IF ANSWER IS WRIGHT SO, DONT SAY THANKS

     

    Posted by sai poreddiwar (Apr 20, 2017 9:29 a.m.)
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  • Answers:
  • FIND THE AVERAGE VELOCITY OF A MOTER BIKE IF IT MOVES WITH VELOCITY 50KM/HR  FOR 10 MIN THEN 40 KM/HR FOR TIME 20 MIN

    Answered by sai poreddiwar (Apr 20, 2017 9:28 a.m.)
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What is the difference between velocity and average velocity? 

 

Posted by Latha Gopal (Apr 16, 2017 11:46 p.m.) (Question ID: 4916)

  • Please answer my question! I want someone to find it out. 

     

    Posted by Latha Gopal (Apr 17, 2017 10:55 p.m.)
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  • Answers:
    • Velocity refers to the rate of change of distance with respect to time. It is a vector quantity, which means that it has both - a direction and a magnitude.
    • Average velocity refers to the average total displacement over the time of travel. It is calculated by determining the average of inital and final velocities.
    Answered by Payal Singh (Apr 18, 2017 8:01 a.m.)
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what is the reason that solution of pottsium permanganate remains coloured even after large number of dilutions

 

 

Posted by Mevin Thomas (Apr 15, 2017 8:53 p.m.) (Question ID: 4893)

  • Answers:
  • The solution of Pottasium permagnate remains coloured  after dilution because the size of particles are very small and remain present in solutins after dilution.

    Answered by RAJENDRA SINGH (Apr 16, 2017 8:40 p.m.)
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Matter is made up of particles. How? 

Posted by Veena Veena (Apr 15, 2017 7:44 p.m.) (Question ID: 4890)

  • Answers:
  • All the matters are made up of very tiny particles that shows interparticlular attraction. 

    Answered by RAJENDRA SINGH (Apr 16, 2017 8:54 p.m.)
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can u help me in understating thechapters which are on the basis of motion

 

Posted by Abhishek Singh (Apr 09, 2017 10:09 p.m.) (Question ID: 4803)

  • Answers:
  • The 3 laws r very imp.then all definitions too..read text and practice qns

    Answered by Arathi Naland (Apr 12, 2017 10:48 a.m.)
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Aayu

Posted by Aayushi Virani (Apr 07, 2017 2:08 p.m.) (Question ID: 4764)

Cbse sa2 board paper solved

Posted by jitendra kumar (Apr 06, 2017 10:06 p.m.) (Question ID: 4750)

what is matter ?

Posted by KENDRIYAVIDYALAYA NO-2ADAMPUR (Mar 30, 2017 9:24 p.m.) (Question ID: 4621)

  • Answers:
  • Ans. Matter is anything, such as a solid, liquid or gas, that has weight (mass) and occupies space.

    Answered by Naveen Sharma (Mar 31, 2017 11:32 a.m.)
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A submarine emits a sonar pulse which return from an underwater cliff in 1.2 seconds if the speed of sound in a sea water is 1530 metre per second how far is the Cliff from the submarines

Posted by priyanshu kohli (Mar 23, 2017 7:59 p.m.) (Question ID: 4460)

  • Answers:
  • Time =1.2second

    Distance = ?

    Speed = distance travelled /time taken

    1530=distance/1.2

    Distance = 1530×1.2 = 1836m

    So1836m far cliff from submarine

    Answered by Tanisha Jain (Mar 23, 2017 9:22 p.m.)
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In a factory 4 bulb 100 watt each and 5 fans of 110 what is operate for 12 hours daily. calculate the unit of electricity consumed also find the total expenditure of 1 unit cost rupees 2.50

Posted by priyanshu kohli (Mar 23, 2017 7:54 p.m.) (Question ID: 4459)

  • Answers:
  • Ans. Power of 4 bulbs of 100 Watt = {tex}4\times 100 = 400W = 0.4KW{/tex}

    Power of 5 Fans of 110 Watt = {tex}5\times 110 = 550W = 0.55KW{/tex}

    Total Power = 0.4 + 0.55 = 0.95KW

    Time = 12hours

    Electricity Consumed = {tex}Power \times time{/tex}

    => {tex}0.95\times 12 = 11.40 \space KWh{/tex}

    Rate of Unit = 2.50 Rs.

    Total Expenditure = {tex}11.40 \times 2.50 = 28.50 Rs{/tex}

    Answered by Naveen Sharma (Mar 24, 2017 8:44 a.m.)
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Loaded test tube placed pure milk sinks to a certain mark m and now some water is mixed with the milk will a test tube sink more or less explain

Posted by priyanshu kohli (Mar 23, 2017 7:50 p.m.) (Question ID: 4458)

  • Answers:
  • Loaded Test tube (Lactometer) will sink more as the desnity of milk is decreased due to addition of water.

    Answered by RAJENDRA SINGH (Mar 24, 2017 9:43 a.m.)
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A force of 300 Newton acts on a surface of area 10 centimetres square calculate thrust and pressure calculate the change in pressure is the area increase to 50 centimetre square

Posted by priyanshu kohli (Mar 23, 2017 7:44 p.m.) (Question ID: 4457)

  • Answers:
  • Force = 300N

    Area of square = 10 cm2 = 0.01 m2

    Thrust = Force/ area = 300N/ 0.01 m2 = 30000 Pa.

    New area= 50 cm2 = 0.25 m2

    new pressure = 300/0.25 = 1200 Pa.

    Answered by RAJENDRA SINGH (Mar 24, 2017 9:52 a.m.)
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The mass of a iron cube having an edge length 1.8 centimetre is 70 gram find density

Posted by priyanshu kohli (Mar 23, 2017 7:33 p.m.) (Question ID: 4456)

  • Answers:
  • Ans. Edge of iron cube = 1.8 cm

    Volume of iron cube V = {tex}1.8\times 1.8\times 1.8 = 5.832cm^3{/tex}

    Mass of iron cubd m = 70g 

    {tex}Density \space \rho = {mass \over volume } ={ 70\over 5.832}{/tex}= 12.0027g/cm3

    Answered by Naveen Sharma (Mar 23, 2017 10:30 p.m.)
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How do you determine the maximum number of electron that can be accommodated in particular cell of an atom

Posted by priyanshu kohli (Mar 23, 2017 7:31 p.m.) (Question ID: 4454)

  • Answers:
  • By the formula of (2n²)

    Like for the k shell = we know that k shell is the first shell of atom so by using above formula we easily calculate the maximum number of electon accomondate in a shell where n is the no. of shell 

    (2n²)= 2×(1)²=4

    So k shell have maximum four electrons

    So by using this formula we find no. Of electrons in L shell M shell and so on.....

    Answered by Tanisha Jain (Mar 23, 2017 9:33 p.m.)
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Classify the disease into categories on the basis of period of their appearance and explain in brief. give two example of disease of each category.

Posted by Sahil Jaiswal (Mar 23, 2017 12:21 p.m.) (Question ID: 4440)

  • Answers:
  • Two categaries of disease on the basis of period of their appearance are

    a. Acute disease

    b. Chronic disease.

    Answered by RAJENDRA SINGH (Mar 23, 2017 6:30 p.m.)
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define avogadro constant

Posted by Aashish Dewangan (Mar 23, 2017 8:07 a.m.) (Question ID: 4431)

  • Answers:
  • Avogardo number is the a constant that represpents 6.22 x 1023 particles. it is the number of particles present in one mole of  any element or molecule.

    Answered by RAJENDRA SINGH (Mar 23, 2017 8:28 a.m.)
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What is gravitation

Posted by Lucky Boy (Mar 23, 2017 7:36 a.m.) (Question ID: 4430)

  • Answers:
  • Gravitation is the force by which earth attracts all the objects towards its centre.

    Answered by RAJENDRA SINGH (Mar 23, 2017 8:29 a.m.)
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what are ions?

 

Posted by HARSH SINGH (Mar 22, 2017 9:08 p.m.) (Question ID: 4421)

  • Answers:
  • Charge particles are called ions. Positevely charged ions are called cation and negatively charged ions are called anion.

    Answered by RAJENDRA SINGH (Mar 22, 2017 9:46 p.m.)
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any four characterstics of the frog?

 

Posted by HARSH SINGH (Mar 22, 2017 9:08 p.m.) (Question ID: 4420)

  • Answers:
    • Frog is an amphibian.
    • It is cold blooded animal.
    • It can live in water as well as land.
    • body is soft and slippery.
    Answered by RAJENDRA SINGH (Mar 22, 2017 9:49 p.m.)
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what is atomic no.?

 

Posted by HARSH SINGH (Mar 22, 2017 9:07 p.m.) (Question ID: 4419)

  • Answers:
  • The number of protons present in the nucleus of an atom is called atomic number.

    Answered by RAJENDRA SINGH (Mar 22, 2017 9:50 p.m.)
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what is nomenclature?

 

Posted by HARSH SINGH (Mar 22, 2017 9:07 p.m.) (Question ID: 4418)

  • Answers:
  • The process of naming scientifically following rules is balled nomenclature. In biology it is called as binomial nomenclature.

    Answered by RAJENDRA SINGH (Mar 22, 2017 9:51 p.m.)
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what is the symbol,atomic no. and atomic mass of sodium?

 

Posted by HARSH SINGH (Mar 22, 2017 9:07 p.m.) (Question ID: 4417)

  • Answers:
  •  symbol- Na

    atomic no- 11

    atomic mass- 23

    Answered by anisha grover (Mar 22, 2017 9:30 p.m.)
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