Étiquette : NEET PHYSICS
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Calculating Distance Traveled: Motorboat Acceleration
Question: A motorboat starting from rest on a lake accelerates in a straight line at a constant rate of 3.0 ms-2 for 8.0 s. How far does the boat travel during this time ? Solution: Distance traveled Initial velocity of the motorboat (u) =0 (since the boat starts from rest) Acceleration (a) =3 ms-2 Time…
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A racing car has a uniform acceleration of 4 ms-2. What distance will it cover in 10 seconds after the start ?
Solution: Initial velocity of the racing car u=0 (since the car was initially at rest) Time taken (t) =10 second Acceleration of the racing car (a) =4 ms-2 Distance covered by the car =? Let us substitute the above values in the following equation of motion $$s=ut+\frac{1}{2} a t^2$$ $$s=0(10)+\frac{1}{2}4(10^2)$$ $$s=200 m$$ Therefore the distance…
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A ball is thrown upwards from the ground with an initial velocity ‘u’.The ball is at a height of 60 m at two times,the interval being 6 s.Find the initial velocity ‘u’
Solution: First Method: The ball reaches the given height of 60 m at a time t 1 seconds ( rising up).For the second time it reaches the 60 m height at a time t 2 seconds. (comes down) Applying the equation of motion with the sign convention. Initial velocity (u) = +u Acceleration due to…
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Vector Addition: 60 N and 80 N Forces at 60° Angle
Question: Two forces of 60 N and 80 N acting at an angle of 60 degree with each other pull an object.What single pull would replace the given forces? Solution: Vector addition Let the two forces be represented as A and B which are inclined at an angle of 60 degree.The resultant of these two…
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Calculation of Resultant Force Angle | 120° Solution
Question: Two equal forces have their resultant equal to either.At what angle they are inclined? Solution: Resultant force Angle $$R=\sqrt{A^2+B^2+2AB Cos\theta}$$ Let the two forces be represented by A and B and their resultant is R. Here A=F, B=F and R=F; Reason: the given two forces are equal and their resultant is equal to either.…
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