QUESTION 6 (15)
6.1 A bicycle wheel starts from rest and accelerates to an angular frequency of
3.50 rev/s. Determine the wheel’s average period T and centripetal velocity Vc
of the edge of the a wheel when the radius is 0.75 m.
(5)
6.2 An object of mass m is attached to a spring of length /. If the spring is extended
by a distance e and released. Show that the period, T, of the oscillation is given
by T = 2x §
(4)
6.3 A spacecraft of mass 256 kg land on the moon. Calculate the moon’s
gravitational acceleration, g, on the spacecraft. [Take mass of moon = 7.5 x
1072 kg, radius of the moon = 1.6 x 10 ®m, G = 6.67 x 10-1! Nm 2 kg®]. Start
with two forces that can be used for this scenario.
(6)
QUESTION 7 (10)
7.1 Explain the terms adhesion and cohesion.
(3)
7.2 Describe two pieces of evidence for surface tension based on cohesive and
adhesive forces.
(4)
1.3 During the time when a man had flu, he ran a fever of 2.0°C above normal.
His body temperature was 39.0°C instead of the normal 37.0°C. Assuming
that the man has a mass of 80 kg and that the human body is mostly water,
how much heat is required to raise his temperature? [Take specific heat
capacity of liquid as, c = 4186 J / kg.°C]
(3)
END OF QUESTION PAPER