Weightlessness in a satellite
Guion Bluford Experiences Weightlessness on the KC-135 – GPN-2002-000148 (Photo credit: Wikipedia)
Why does an astronaut feel weightless in a space capsule orbiting the earth?
I’ve gotten a key point saying that the space capsule orbiting the earth has a centripetal acceleration, but I cannot figure out why is it related to the question.
Asked Ganondorf Jallida
Answer: The centripetal acceleration is provided by the force of gravity. Since the force of gravity is completely used up in providing the centripetal acceleration to the space capsule, the astronaut feel weightlessness.
Categories: Ask Physics, AstroPhysics, Interesting Questions Tags: Astronaut, Chris Hadfield, earth, gravitation, International Space Station, NASA, Space capsule, weightlessness
Conservation of linear momentum – Problem
Astronauts Mr.X and Mr.Y float in a zero gravity space with no relative velocity to one another. Mr. Y throws a mass of 5 kg towards X with speed 2 m/s. If Mr. X catches it, the change in velocity of X and Y are (choose the correct option)
(a) 0.21 m/s, 0.80 m/s
(b) 0.80 m/s, 0.21m/s
(c) 0.12 m/s, 0.08 m/s
(d) 0.08 m/s, 0.12 m/s
Please provide me the solution part step by step
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Categories: Ask Physics, AstroPhysics, CBSE PHYSICS CLASS XI Tags: Alternative, Dark energy, Dark matter, gravitation, Momentum, physics, relative velocity, Sichuan University
Question from Special Relativity
A spacecraft starts from earth moving at constant speed to planet A which is 20 light-hour away from Earth.
It takes 25 hour (according to an earth observer) for a spacecraft to reach this planet. Assuming that clocks are synchronized at the beginning of the journey, compare the time elapsed in the spacecraft frame for this one-way journey with the time elapsed as measured by an earth-based clock?
Posted by Mona
Categories: Ask Physics, AstroPhysics, IIT JEE, Interesting Questions, Numerical Problems, Problems, Relativity Tags: earth, Jet Propulsion Laboratory, Jupiter, mars, NASA, Spacecraft, Voyager 1, Voyager program
Speed of Gravity
Why hasn’t anyone measured the speed of gravity yet?
As in, how long does it take for the gravitational field of a mass to affect another mass?
Musaddiq Sajjad asked.
Answer:
Who said that speed of gravity waves is not measured?
Please go through the links below and you ca get details,
- http://www.newscientist.com/article/dn3232-first-speed-of-gravity-measurement-revealed.html
- http://en.wikipedia.org/wiki/Speed_of_gravity
- http://scienceblogs.com/startswithabang/2010/08/what_is_the_speed_of_gravity.php
- http://www.metaresearch.org/cosmology/speed_of_gravity.asp
Categories: Ask Physics, AstroPhysics, Gravitation Tags: Alternative, earth, gravitation, Gravitational field, Jainism, physics, Quantum Field Theory, quantum mechanics
