Qualification > Sciences
Edexcel PHYSICS Doubts
dk bose:
Sir, its still not clear to me.you have to get the final answer as 1.05m.try it one more time. its becoming really hard for me to solve the sum. waiting for ur reply!!!
astarmathsandphysics:
Is the book wrong?
Like the retarded cowboy who thought Iraq could destroy the world?
dk bose:
Sir,its not joketime!!! i have doubts with which i have to deal as my exams are coming up.they are-
1)a racing car is moving at constant velocity along a track.explain how newton's first law is satisfied for this racing car.
2)Describe and explain how the resultant force on a skydiver varies from the moment they jump from a plane.
3)A person standing on a bus is thrown towards the rear of the bus as it starts to move forwards and to the front as it slows down.why?
astarmathsandphysics:
1)forces balanced so no constant speed in straight line
2)Air reistance zero to start. It increases as the parachitist falls until it equals his weight and his velocity is constant. When he opens his chute air resistance increases suddenly so there is resultant upwards force and acceleration upwards until air resistance equals weight again and speed is constant.
3)Because the passenger has inertia - his body will resist any attempt to change its state of motion.
dk bose:
some more doubts-
1)When a driving force is removed,a moving object 's drag will slow it down to a stop.This means it loses all its kinetic energy.explain how this disappearance of energy can be in keeping with the law of conservation of energy.
2)one way of storing surplus electrical energy from a power station is to use it to raise water from a lower reservoir to a higher one.This water can then be released to generate electricity again later.explain how this system might be limited by the law of conservation of energy.
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