In a circuit with a thermistor and bulb, what happens to the brightness of the bulb as the temperature increases?
As the temperature increases, the resistance of the thermistor decreases. So the resistance of the whole circuit decreases. Using V=IR, the PD remains constant but resistance has decreased, so current must increase. Using V=IR in just the bulb, the resistance is unchanged, the current has increased so the PD increases. The bulb gets brighter
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All answers ▸A projectile is fired at an angle of 30 degrees from the horizontal, it reaches a maximum height of 12m above the ground before coming to rest 600m from its initial starting point at the same level. What is the initial speed of the projectile?
This Question is a multi-parter but all around the same scenario. Similar to an end of paper A-level physics question.
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The radius of the Earth is 6,400km and has a mass of 6x10^24kg. Calculate the minimum velocity needed by a projectile, fired from the surface of the Earth in order to escape the Earths gravity.