A roller coaster car moves in a vertical circle of radius R. At the top of the circle the car has speed v1, and at the bottom of the circle it has speed v2, where v2 > Vị. Suppose that v2 is in the +x-direction, and +y-axis is directed upward. Part A When the car is at the top of its circular path, what is the direction of its radial acceleration, azad, top? The direction angle Btop of the radial acceleration arad, top is measured from the +r-direction toward the +y-direction. Express your answer in degrees. Πνα ΑΣφ Brop =

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.