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What is time?
1. This is the question that each true scientist dreads to be asked especially in a public setting by extremely inquisitive young learners. We have learned to calculate and measure it relative to the natural arrangement of known and visible celestial bodies. This is the ultimate queries you ask a theoretical astro physicist if you want to see them shake in their pants.
To this day time can only be explained by the measure of elapsed period using the SI unit, Seconds. It is the only SI unit that is freely permitted to shift depending on subject topic. For instance in Astro physics, to measure distance among galaxies it would be impractical to use seconds as the measure of time it takes light to travel among the two galaxies Time transcends everything known to man up to and containing the universe, time has no beginning or end. Time is constant and infinite and we just tap in and out of it in reference to occurrence of an event.
a body travelling with uniform acceleration crosses two points A &B with velocities 30m/s & 50m/s the speed of the body at mid point of A&B is approximately?
Define the Critical Angle and Fiber Optics When light is traveling in an optically dense medium, like water, and comes to the boundary of a less dense medium, like air, there a
1. We want to measure a sinusoidal signal (frequency 100 Hz) expected to be of strength 1 mV RMS in the presence of noise of peak amplitude 3 mV. (a) If our A/D converter has
what, why, use
What are solid core fibers? This optics is cylinders made of diverse polymers and encased upon a transparent tube or sheath. As a standard are manufactured in various gauges or
For any single force vector, there is only one angle for which its x- and y-components are equal in size. a. What is that angle? b. How many times bigger is a vector at this
State the uses of Zinc sulphide Zinc sulphide has a lattice constant of 0.596nm . The sulfide ions are quite big (atomic radius 184 pm) relative to the size of the zinc ions (7
It makes sense that copper should be used because it could heat up faster, making the event more efficient.
Path of a projectile The apparatus below can be used to indicate the independence of the horizontal and vertical velocities of a projectile. The projectile is a metal ball, and
By what factor would the I 2 R loss in transmission wires be reduced if the transmission voltage were boosted from 220 V to 22 kV? Suppose that the rate of energy delivered is
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