Recent content by Deebu R

  1. Deebu R

    _+_+_= 30 fill in the gaps using....

    Homework Statement _+_+_= 30 (Fill the gaps using 1,3,5,7,9,11,13,15) Homework EquationsThe Attempt at a Solution I tried to go with x+y+z= 30 Then tried substituting values This is not an official question. Just something my friend asked me and I was curious. Please don't take any offense...
  2. Deebu R

    B Why do arrows deviate from the target in archery?

    What causes the arrow to deviate? Why doesn't it just go to the aimed object?
  3. Deebu R

    B Why do arrows deviate from the target in archery?

    Ah sorry. I was talking about the basic, less expensive tools. As your bows and arrows improve your accuracy too will improve. Also the distance of deviation is not too big. With practice you can easily lean to shoot accurately. But don't you think if it was that easy everyone would do Olympic...
  4. Deebu R

    B Why do arrows deviate from the target in archery?

    I was wondering why arrows deviate away from the target. If the arrow aimed at an object it usually lands above the object. Also if the mass of the arrow is increased it seems to get more and more accurate. Could someone explain why this happense?
  5. Deebu R

    Why does the gravity of a shrunken Earth increase by nearly 2%?

    g2= ((100GM)/(99R^2))^2 = (100/99)^2 x g1 [since g1= GM/R^2] = 1.02 g1 g1-g2= g1-1.02(g1)= -0.02g1 [(g1-g2)/g1] x 100= -0.02 x 100= -2% Since the percentage is negative I am guessing g is actually increasing not decreasing. Then [(g2-g1)/ g1] x 100 = +2% In that case I believe the...
  6. Deebu R

    Temperature at the junction of 2 wires

    I think I got it , Thermal conductivity of brass=k Thermal conductivityof copper=4k Area of rods= A and length=l Temperature of the junction = θ Rate of flow of heat= KA(100-θ)/l = 4kA(0-θ)/l (100-θ)=4(0-θ) 5θ=100 θ= 20° C. Correct?
  7. Deebu R

    Why does the gravity of a shrunken Earth increase by nearly 2%?

    Taking g1-g2 is the correct method?
  8. Deebu R

    Why does the gravity of a shrunken Earth increase by nearly 2%?

    I did g1- g2 this time g2= GM/0.99R^2 and got GM-0.99GM/ 0.99R^2 = 0.01/0.99 Then I divided it with the original value GM/R^2 and got (1/99) x 100= 1.01 So I thought 1 percent
  9. Deebu R

    Why does the gravity of a shrunken Earth increase by nearly 2%?

    Is the right answer 1 percent?
  10. Deebu R

    Why does the gravity of a shrunken Earth increase by nearly 2%?

    Well I guess you can say it's interesting when it poses no threat. But imagine sitting in an exam hall and this shows up and you hear a voice in your head saying "your God, where is he now?"...
  11. Deebu R

    Why does the gravity of a shrunken Earth increase by nearly 2%?

    So the question is wrong?
  12. Deebu R

    Why does the gravity of a shrunken Earth increase by nearly 2%?

    g1= GM/R^2 g2= GM/ (R-R/100)^2. Using (a-b)^2 rule g2= GM/ 100R^2-2R^2+R^2 = GM/99R^2 g1- g2 = GM/R^2 - GM/99R^2
  13. Deebu R

    Why does the gravity of a shrunken Earth increase by nearly 2%?

    I got g1 - g2 =98GM/99 How can I convert this to percentage? Also if you think about it in terms of g is inversely proportional to R^2 then shouldn't gravity increase as radius decrease? So won't that make the question wrong?
  14. Deebu R

    Why does the gravity of a shrunken Earth increase by nearly 2%?

    So if the mass remains the same gravity does not change?
  15. Deebu R

    Temperature at the junction of 2 wires

    To be honest this is the first time I have heard about that law. So I got like, Q=-k (0-100)= 100k Q=-4k(100-0)= -400k?
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