(a) An object's position in metres at a given time t is described by the formula ,3+ 21- 9t + : Find the acceleration of the object when t= 10seconds. (b) The voltage across the plates of a capacitor at any time, t seconds is given by v=Ve where V,C and R are constants. Given V 200volts, C=0.1x10 farads and R = 2x10 ohms find (1) the initial rate of change of the voltage ()the rate of change of the Voltage after 0.2s. (c) The displacement, r, of a particle in simple harmonicmotion is given by - cos(3r)- sin(3t). Show that

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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.