Tema
Q:
\( \frac{\text { Question 9: }}{\text { (3 marks). }} \) The kinetic energy of an 8 Kg ball is 64 J . Calculate the speed of it when being rolled.
Q:
A stationary player accelerates from the home plate to first base.
The player takes 6.61 s to get to first base and arrives moving at 5.45 m s
(a) Show that the average acceleration is \( 0.825 \mathrm{~m} \mathrm{~s}^{-2} \).
Q:
Q1. A ferromagnetic core is shown in Figure Q1. The depth of the core is 12 cm . The other dimensions
of the core are as shown in the figure. By assuming the magnetic leakage to be negligible and relative
permeability of the core is 1000.
(i) Calculate the total reluctance.
Q:
Define the term pressure and state its SI unit.
Q:
D. ST
A body of mass 2 kg is projected vertically upwards with velocity of \( 10 \mathrm{~m}^{-1} \). Find the maximum
height reached.
A. 0.5 m
B. 5.0 m
C. 10.0 m
D. 50.0 m
\( \left(U^{2}=4^{2}+205\right. \)
Q:
15. The driver of a minibus which is moving at \( 80 \mathrm{~km} / \mathrm{h} \) notices a road block a short distance
ahead. He applies brakes immediately so that the minibus moves with a constant
deceleration for 5 seconds before coming to rest at the road block. Find the average velocity
of the minibus during the 5 seconds
Q:
alculate the weight component perpendicylar to the incline.
Q:
A structure with a weight of 3000 N is pulled up an incline which makes an
angle of \( 30^{\circ} \) with the horizontal. The coefficient of friction of 0,6 is operational
between the weight and the incline.
6.1.1 Calculate the weight component parallel the incline.
6.1.2 Calculate the weight component perpendicular to the incline.
Q:
A structure with a weight of 3000 N is pulled up an incline which makes an
angle of \( 30^{\circ} \) with the horizontal. The coefficient of friction of 0,6 is operational
between the weight and the incline.
Q:
Name TWO disadvantages of friction.
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