Problem on spacecraft
Assuming that ground stations are equally distributed on the Earth, how many ground stations are required to maintain constant contact with a spacecraft at 750 km altitude, and 72 degrees inclination?
Expert
Given:
θ (theta) = 72°, Perpendicular distance of spacecraft=750 km.
We know that, 1° = π/180 radian, Radius of earth=6400 km. So, 72°= (72*π)/180 radian, = 2*π/5Since,θ = Arc/Radius,
Therefore, Arc = θ*Radius, =2*π*750/5, = 300π
Circumference of earth = 2*π*Radius = 2*π*6400
No. of space station = Circumference of earth/2*Arc = (2*π*6400)/(2*300*π) = 21 space station (approx.)
Describe when the intermolecular forces are strongest? Briefly state it.
Planck radiation law: The law which explained blackbody radiation better than its precursor, therefore resolving the ultraviolet catastrophe. This is based on the supposition that electromagnetic radiation is quantized. Q : Describe the term ntu in thermodynamics Describe the term ntu in thermodynamics? Illustrate in short.
Describe the term ntu in thermodynamics? Illustrate in short.
State is it possible that the nucleus consists of negative mass defect?
The molecules of many dielectrics possess an electric dipole moment without having an external electric field. In such molecules centres of their positive and negative charges are displaced with respect to each other and therefore form a dipole. Such materials are kno
Negative feedback principle: It is the idea that in a system where there are self-propagating situations, those new situations tend to act against formerly existing situations. Such a principle is in actuality a restatement of the conservation law.
No-hair conjecture (1960s): The conjecture (confirmed in the 1970s and 1980s) in general relativity that a black hole has merely three salient external characteristics: angular momentum, mass, and electric charge. All the other proper
Hoop conjecture (K.S. Thorne, 1972): The conjecture (as so far unproven, although there is substantial proof to support it) that a non-spherical object, non-spherically compressed, will only form a black hole whenever all parts of the
Describe in brief the concept of nuclear reaction?
why quantum physics is studied? give me some of topics
18,76,764
1952071 Asked
3,689
Active Tutors
1461003
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!