sun

  1. E

    Sun's rotation angular velocity.

    Hi: I made a formula to find the angular velocity with which the shade rotates about one's position during one day, assuming the Sun rotates with constant angular velocity $\omega$ in a plane at an angle $\alpha$ with respect to the plane of the horizon. I got $\Omega = (1+tan^2 \omega t)...
  2. M

    Why objects can not fall down on stars ( Earth ---SUN ?)

    light <<< BULB >>> light light = energy [ joul ] space = cubic meter [m^3 ] Joul/ meter^3 = Newton *meter / meter^3 = Newton / meter^2 ( EUREKA !!!pascals ) M,m ----------------planet ( gallileo fall law ) M,m ---------------star ( Marosz EM preasure problem ) FUTURE IN PHYSICS SUN...
  3. Anonymous

    Some beginner questions about sun rays, magnetism and electro-magnetism.

    Hello, I'm new to this forum, and I wonder if anyone will answer my questions. My questions are: 1: What is a sun ray ? What is it made of? 2: What is magnetism? How does it work? 3: What is electro-magnetism, and how does it work? I will be grateful for answers. Thanks a lot !
  4. P

    The path of Earth about sun

    H!, Im confused about calculate this problem plz solve this for me with second law of newton.
  5. D

    RAAN for a sun synchronous orbit?

    Hey, was wondering if anyone here could help me untangle my confusion. I have this lab exercise which among other things requires an orbital analysis for a satellite. Specifically it's a sun synchronous orbit (97 degrees inclination, 393km height). What I'm a bit uncertain of is how to decide...
  6. S

    earth's revolution around sun..

    we all have read that f(g)=(G*m*m*)/r^2 which means for a radius R the force is equal in magnitude throughout the sphere of the same radius R. now my question is "Why is the orbit of earth around sun is elliptical? logically it should be circular, isn't it?" please help me, by answer in...
  7. E

    Radiation from sun?

    I honestly have no clue how to do this... Can someone get me started in the right direction? I'm not even really sure which equations to use >.< A leaf of area 41 cm2 and mass 4.4 10-4 kg directly faces the Sun on a clear day. The leaf has an emissivity of 0.87 and a specific heat of 0.8...
  8. A

    Is it dangerous to look at objects illuminated by strong ultraviolet sunlight atnoon

    during the summer? Besides sunlight hitting mirrors, glass, shiny metal and water(which produce glare obviously), if I say look at sunlit grass, or trees or most other things I encounter outside on a very sunny summer day, are the light-waves bouncing off of them a potential problem compared...
  9. M

    distance between earth and sun and periods

    the distance between earth and sun is usually expressed as one astronomical unit (AU). Using this unit, find the distance between the sun and mars, which has a period of approximately 686 earth days
  10. O

    odd sun problem

    i was surprised to find this problem in my hwk since it seems to be more of a geometry problem almost... the sun sets, fully disappearing over the horizon as you lie on the beach, your eyes 10 cm above the sand. you immediately jump up, your eyes now 130 cm above the sand, and you can again see...
  11. W

    Collapse of the sun

    If the sun collapses and changes to white dwarf, enormous amount of energy would be released as gravitational energy is converted to kinetic energy and heat. But I wounder why sun would collapse? What originally supporting the ground of sun has vanished? To what extent would the ground of...