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Describe why Earth is usually the stationary reference frame in the word problems we have worked on. Describe a situation where Earth may not be used as a stationary reference frame and why it might be useful to not use it as a stationary reference frame.

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A centrifuge spins with a frequency of 3.1 x 103 Hz. A particle in a test tube is positioned5.2 cm from the center of the centrifuge (Hint - ac = 4π2rf2 and rest you have to explain)a) Determine the acceleration of the particle at this position from Earths frame of referenceb) Why do you think centrifuges need such a high frequency?c) Why do you think medical research’s want to separate particles at all?
Kepler’s Law relates the period T ( in a sec) of a satellite to the distance from the center of the earth r (in m) to some physical constants as shown: T2 = (2π/ G ME) r3 Where G = Universal Constant of Gravitation and ME is the mass of the earth. A stationary satellite is one that circles the earth in a circular orbit but stays exactly above the same spot on the earth. Calculate the distance above the earth in m for this “geo-synchronous satellite” to orbit, then convert that height to miles.
I keep getting this wrong despite working it out many times. Can I please get some insight on the right approach? A team of astronauts is on a mission to land on and explore a large asteroid. In addition to collecting samples and performing experiments, one of their tasks is to demonstrate the concept of the escape speed by throwing rocks straight up at various initial speeds. With what minimum initial speed ?esc will the rocks need to be thrown in order for them never to "fall" back to the asteroid? Assume that the asteroid is approximately spherical, with an average density ?=3.32×106 g/m3 and volume ?=2.40×1012 m3 . Recall that the universal gravitational constant is ?=6.67×10−11 N·m2/kg2 . Answer in m/s
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Tidal forces are gravitational forces exerted on different parts of a body by a second body. Their effects are particularly visible on the earth's surface in the form of tides. To understand the origin of tidal forces, consider the earth-moon system to consist of two spherical bodies, each with a spherical mass distribution. Let r. be the radius of the earth, m be the mass of the moon, and G be the gravitational constant. Part B Since the gravitational force between two bodies decreases with distance, the acceleration anear experienced by a unit mass located at the point on the earth's surface closest to the moon is slightly different from the acceleration afar experienced by a unit mass located at the point on the earth's surface farthest from the moon. Give a general expression for the quantity anear-afar Express your answer in terms of G, m, r, and re. ▸ View Available Hint(s) anear afar = ΜΕ ΑΣΦ ? x Xb √√x √x X [X] X.10" Variables are case sensitive. No credit lost. Try again.
A rocket is launched and attains a speed of 5700_m/s when 63000_m above the surface of the Earth. If the engines then shut down, how much higher will the rocket rise before beginning its fall back toward the Earth? А. 4066000_m D. 2353000_m В. 1703000_m Е. 3876000_m С. 2292000_m F. 3573000_m
What is the height of an object that has a mass of 3.50 kg and a gravitational potential energy of 546 J? Select one: O a. b. 15.9 m 156 m C. 1530 m O d. 1911 m
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Answer part C). If the blue object actually had an inital veloctiy of 50 m/s j, how long after the green projetile is launched should the blue object be launched if they are to collide? Let the blue object be traveling upward when they collide.