21 March perihelion 3 January line of solstice 147 million km 21 June 21 December aphelion 3 July 152 million km 23 September xouinbə
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- Two satellites, A and B, are in different circular orbits about the earth. The orbital speed of satellite A is 1.24 times that of satellite B. Find the ratio of the period of satellite A to that of satellite B.A person drives a car around a circular cloverleaf with a radius of 64 m at a uniform speed of 10 m/s. (a) What is the acceleration of the car? (b) Compare this answer with the acceleration due to gravity as a percentage.By what factor will the acceleration due to gravity change if the mass of a planet is double and the size of the planet is also doubled?
- An object is dropped from rest a distance d near the surface of Earth and takes time t. If the same object is dropped from rest from a different height and takes time 4t, it must have fallen a distance 2 d 1/2 d O 1/4 d 16 d 4 dSuppose an object moves with velocity v(t) = -/4t + 9i + 5j + (4 – 2t)k meters per second, and it has initial position r(0) = 2i – 7j +k. a) Find the position function r(t). b) At the initial time, is the object moving upwards or downwards? Why? c) Find the speed function of the object at time t. d) Find the tangential component of acceleration when t = 0. %3D O Do not answer here.