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Difficult Problems in physics From post utme (Unilorin 2007)
Physics
Chima Sunday (Tutor)
04-04-2016 17:20:00 +0000About 85% that attempted these questions got it wrong, try and see if you can be able to get it right. Question 1 A car accelerates from 3m/s to 100m/s in 35s. Calculate the acceleration of the car.
Option A 2.0ms^2
Option B 3ms^2
Option C 4ms^2
Option D 5ms^2
solution
recall that acc = final velocity(v) - initial velocity(u) divided by change in time
i.e acc = (v - u)/t = (100 - 3)/35 = 2.8 = 3m/s^2
so correct option is B
Question 2 A body of mass 2kg moves round a circle of radius 2m with a constant speed of 10m/s. Calculate the force toward the centre..
Option A 40N
Option B 50N
Option C 80N
Option D 100N
solution
the force that acts toward the center is centripetal force
so F(c) = mv2/r
m = 2kg, r = 2m and v = 10m/s
so F = 2*10^2/2 = 10^2 = 100N
so correct option is D
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Chima Sunday (Tutor)
Thumb up to all of you that attempted to solve this questions, that was a bold step keep it up @Cyprian Igbokwe, Miriabel Paul, Damian Nonsy. mean while the updated version of these question with solution have been updated.
0 06-04-2016 15:57:00 +0000
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