What prevents gravity from pulling you through the ground to the center of the Earth? Choose the best answer
1.The density of matter is too great.
2.The positive nuclei of your body’s atoms repel the positive nuclei of the atoms of the ground.
3.The density of the ground is greater than the density of your body.
4.Atoms are bound together by chemical bonds.
5.Electrons on the ground’s surface and the surface of your feet repel one another.
5
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The average value of 
t for a complete cycle is
A. 1. B. 0. C. 0.707. D. 0.500. E. 0.250.
Compared to "Special" Relativity, "General" Relativity is more concerned with
A) gravitation. B) mass-energy. C) Unified fields. D) Lorentz transformations. E) electromagnetic fields.
An airplane undergoes the following displacements: First, it flies 66 km in a direction 30° east of north. Next, it flies 49 km due south. Finally, it flies 100 km 30° north of west
Using vector components, determine how far the airplane ends up from its starting point. A) 79 km B) 81 km C) 82 km D) 78 km E) 76 km
Ganymede is larger than Mercury, but it is not classified as a planet because it orbits Jupiter as opposed to the sun
Indicate whether the statement is true or false