Describe how a satellite is placed into orbit and remains in orbit around the earth
What will be an ideal response?
A satellite is put into orbit by accelerating it to a sufficiently high tangential speed with the use of rockets. If the speed is too high, the spacecraft will not be confined by the Earth's gravity and will escape, never to return. If the speed is too low, it will return to Earth. If the satellite stopped moving, it would fall directly to Earth.
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The best filter to remove the K? x-rays from a Mo x-ray tube that have a wavelength of 0.06322 nm but that transmits the K? x-rays of wavelength 0.0711 nm is
(a) Nb with a K edge of 0.06529 nm (b) Mo with a K edge of 0.06198 nm (c) Y with a K edge of 0.07276 nm (d) Ru with a K edge of 0.05605 nm
A mass hangs from a spring that is fixed to the ceiling. The mass is now pulled down and released so the mass oscillates up and down. Which of the following statements is true?
A. The gravitational force on the mass oscillates at the same frequency as the mass B. The kinetic energy of the oscillating mass is a constant C. Adding mass to the spring will make it oscillate faster D. The restoring force of the spring is equal to the weight of the mass E. None of these choices are true
A rocket of mass M carries a mass m of fuel and starts from rest
Which method of burning the fuel would result in the greatest final speed of the rocket after all the fuel is burned if the velocity of the exhaust gas relative to the rocket is fixed at uex? A) Burn the exhaust gas at an exponentially increasing rate until it is exhausted. B) Burn the fuel as slow as possible so the force on the rocket acts for the greatest time resulting in the greatest possible impulse to the rocket. C) Burn the fuel slowly until the rocket reaches a speed equal to uex and then burn the remainder as quickly as possible so that the exhaust gas has the minimum kinetic energy. D) Burn the exhaust gas at an exponentially decreasing rate to make it last forever. E) Burn all the fuel in as short a time as possible.
In radioactive decay, when the parent material decays to one-quarter of its original amount, the time is
A) one half-life. B) two half-lives. C) three half-lives. D) four half-lives.