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  1. S

    Effect of pressure at ocean-bottom

    yes sir, surely i will. thank you.
  2. S

    Effect of pressure at ocean-bottom

    well thanks. my doubt is cleared now.
  3. S

    Effect of pressure at ocean-bottom

    If we take a steel container, fill it completely with water and seal it back (all this at sea-level), and then take it to bottom of sea, what will happen to the container? Will it be crushed? What equation should we use to relate initial and final volume? Kindly help.
  4. S

    How refrigerators and air conditioners work

    the heat you are talking about is taken from the things (and air) kept in the refrigerator, thus cooling them.
  5. S

    Polarized Dielectric and Charge Density.

    thank you. but how do i find the divergence of polarization?
  6. S

    Polarized Dielectric and Charge Density.

    Homework Statement A long round dielectric cylinder is polarized so that the vector P = ar, where 'a' is a +ve constant & 'r' is the distance from the axis.find the space density rho` of bound charge as a function of distance r from the axis. Homework Equations Gauss Law. The...
  7. S

    Mass creation from m=e/c^2. is it even possible?

    yes it can. 100% efficiency will be hell for a bomb, and heaven for a power plant.
  8. S

    Produce Electricity from unused Radio waves?

    yes you are right. so the best way forward is to increase the efficiency of our PV cells.
  9. S

    Gravitation and magnetic field?

    its because of the centrifugal force.
  10. S

    Produce Electricity from unused Radio waves?

    and what about using the cosmic background radiation and also the earth's magnetic field fluctuations due to constantly fluctuating magnetosphere?
  11. S

    Mass creation from m=e/c^2. is it even possible?

    so it means that 100% is not utilised, only a small fraction is converted to energy.
  12. S

    Gravitation and magnetic field?

    you can however change or control directions of moving charged particles using magnetic fields.
  13. S

    Mass creation from m=e/c^2. is it even possible?

    It would require 1kg Uranium only if ALL the atoms of uranium are converted to energy. Usually its is around 2-3%, not 100%.
  14. S

    Produce Electricity from unused Radio waves?

    yes, i agree with Mr. Palladin. i was thinking the same thing.
  15. S

    Produce Electricity from unused Radio waves?

    economic concerns dont stop research for improvement.
  16. S

    Produce Electricity from unused Radio waves?

    yes i was thinking about that too. it will be economically unfeasible. but what if we increase the antenna area? suppose we embed antennas in all the walls and roof, like a faraday cage? will it work? could it just be enough to power up 3 bulbs and a fan? if so, it would be most useful for...
  17. S

    Produce Electricity from unused Radio waves?

    Hello everyone! I was just thinking about whether it will be possible to utilise the energy transmitted through the radio waves to produce back electricity for a household. Most of the houses in the world are blanketed by radio waves from all directions. Will it be possible to use an antenna...
  18. S

    Centripetal Force; calculating speed

    which is correct answer!
  19. S

    Direction of induced current

    you would need to study maxwell's equations to understand it. also study about electron drift.
  20. S

    Direction of induced current

    the answer will be Counter-clockwise, if the current is decreasing.
  21. S

    Mass wraps around rod in circular motion

    use energy conservation, where x is the distance moved downwards by the mass, so mgx = 1/2 mv^2 + 1/2 Iw^2 and use, w = v/r
  22. S

    Power radiated by the Sun

    its better you convert everything in SI units before you calculate, and at the end change the units of the final answer as per requirement.
  23. S

    Power radiated by the Sun

    what is the link with Power radiated by the Sun?
  24. S

    Which hill requires less work to push an object up. Concepts prob, no #s &/or math

    please note that the friction force also depends on the Normal reaction, which depends on cosine of the angle of inclination. f = mg.cos(theta). So steeper the slope, lesser is the frictional force.
  25. S

    Book Problems

    i have not checked the calculations though.
  26. S

    Book Problems

    your solution is correct.
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