Search results

  1. S

    Chemistry is a mystery!

    I can't bring myself to like this subject. And I can't do my desired course without being good at it. Its like one information after the other and some things make no sense and too many exceptions. :cry: If there's someone out there who likes chemistry, then please tell me what about this...
  2. S

    Does photorespiration help avoid photorespiration?

    In C3 plants, RuBisCO acts as an oxygenase when CO2 concentration is below a certain value. As a result, a process called photorespiration takes place. Photorespiration leads to the formation of toxic ammonia and CO2. Moreover, it uses up ATP and don't form glucose. So its considered a wasteful...
  3. S

    Probability all balls are white.

    Homework Statement A bag contains 4 balls. Two balls are drawn at random, and are found to be white. What is the probability that all balls are white? 2. Relevent equations At school, I'm currently learning Bayes' theorem, probability disribution and Bernoulli trials. The Attempt at a...
  4. S

    Time taken for body under free fall

    Homework Statement A ball is dropped from the top of a cliff. If time taken for half of the descent is 3s, then what is the time taken for the rest of rest of the descent? Take g=10m/s2 Homework Equations T=√(2h/g) v=u-gt s=ut-gt2/2 The Attempt at a Solution T=√(2h/g) h=T2g/2=45m...
  5. S

    Inheritance: What is the chance of the next calf being amputated

    Homework Statement The absence of legs in cattle (amputated) has been attributed to a completly recessive lethal gene. A normal bull is mated with a normal cow and they produce an amputad calf (usually dead at birth). The same parents are mated again. 1) What is the chance of the next calf...
  6. S

    Factors supporting Extinction

    It was given in my school textbook that large body size, small population size, low reproductive rate, feeding at high trophic levels, fixed migratory roots and habitats and localised and narrow range of distribution are the characteristics susceptible to extinction. I don't understand how...
  7. S

    Living and Non-living

    I have learnt in my second grade that all things are categorised into living and non-living things. Living things breathe , grow, reproduce, etc., I don't really remember... and non-living things don't. I was thinking if there was something that isn't living or non-living; something entirely...
  8. S

    Some simple doubts

    I had a few doubts in mind. Please help. 1) Is -15 the L.C.M. of -5 and -3? 2) Can all complex numbers be plotted in a number line. 3) 1^(1/3)= 1, ω, ω^2, where ω= -(1/2)+i[3^(1/2)/2] Then, if we plot these 3 values along a number line, will we get 3 different points or will it...
  9. S

    Tropical latitudes have remained relatively undisturbed

    "Tropical latitudes have remained relatively undisturbed for millions of years. Undisturbance gives enough time for species diversification." I read this in my school textbook. For diversification, shouldn't there be evolution and speciation. And for that shoudn't there be some disturbance...
  10. S

    Decimal Expansion

    I read here in Physics Forums that a number can have more than one decimal expansion. Really? Can someone explain how? Is it that any number can have more than one decimal expansion or only some numbers?
  11. S

    Biodiversity and Conservation

    Homework Statement It is sure that there is loss of species, is it possible for the vice-versa condition? a) yes, it is a must b) yes c) possible d) doubtful e) none of these 2. The attempt at a solution I thought the answer was option (a) so as to maintain the balance in nature...
  12. S

    Need help for School Project

    I have to do an investogatory project in school and we can choose the topic of our choice. My teacher has suggested an experiment where we could study the damping effect of a pendulum in three different media-air, water and magnetic field. This sounds pretty interesting (and pretty simple) to...
  13. S

    Derivatives and Integrals

    What I have learnt in school is that differentiation and integration are opposites. By integrating a function we find the area under the graph. So, integration gives us the area. Differntiation gives slope of the function. If I am right by saying differentiation and integration are...
  14. S

    Slope of a function.

    If there is an equation for a curve, its derivative will be the slope of the tangent. Also, the derivative of a function is the limit of its slope. What I understand from this is that (slope of tangent)=(limit of the same slope) But this is wrong (right?). Please explain the mistake here.
  15. S

    Trying to understand limits.

    Homework Statement lim(x+3)=? x→3 Homework Equations Substituting x=3, I think. The Attempt at a Solution lim(x+3)= 3+3= 6 x→3 So we have got this straight lined graph, f(x)=x+3, and the answer I got shows... what exactly?
  16. S

    Proof for first principle equation in derivatives?

    Please explain how this equation is derived. f'(x)= lim [f(x+h)-f(x)]/h h→0 Thanks.
  17. S

    What came first, the chicken or the egg?

    I think it is the chicken. I can't understand why there is such confusion? Why is it compared to the promblem over the first genetic material formed? Is there any explanation on the basis evolution or mutation that supports the egg to be formed first?
  18. S

    Why is air invisible?

    Is it because the atoms constituting air are far apart? Or is it because they don't give out radiations in the visible range?
  19. S

    Can we see an ideal black body?

    Would an ideal black body be visible to us? What about Ferry's black body? How close was it to an ideal black body?
  20. S

    Are photons necessary for an object to show colour?

    Hi, I know without light, an object can't give out radiations thus, show no colour. So if we keep any object in a completly dark room, it would not exhibit colour. Suppose we send in a large amount of sound energy into the same room. The object in the room would absorb some amount of...