Question 4821:

A body of weight \(W \mathrm{~N}\) rest on a smooth plane inclined at an angle \(0^{\circ}\) to the horizontal. What is the resolved part of the weight in newtons along the plane?

A. \(W \sin \theta\)
B. \(W \cos \theta\)
C. \(W \sec \theta\)
D. \(W \tan \theta\)

Question 4822:

A small metal ball is thrown vertically upwards from the top of a tower with an initial velocity of \(20 \mathrm{~ms}^{-1}\). If the ball took a total of \(5 s\) to reach ground level, determine the height of the tower.

A. \(60 \mathrm{~m}\)
B. \(80 \mathrm{~m}\)
C. \(100 \mathrm{~m}\)
D. \(120 \mathrm{~m}\)

Question 4823:

An object moves with uniform speed round a circle. Its acceleration has ____________

A. Constant magnitude and constant direction
B. Constant magnitude and varying direction
C. Varying magnitude and constant direction
D. Varying magnitude and varying direction

Question 4824:

A wheel and axle have radil \(80 \mathrm{~cm}\) and \(10 \mathrm{~cm}\) respectively. If the efficlency of the machine is \(0.85\), and applled force of 120 Nto the wheel will raise a load of ____________

A. \(8.0 \mathrm{~N}\)
B. \(6.8 \mathrm{~N}\)
C. \(8160.0 \mathrm{~N}\)
D. \(9600.0 \mathrm{~N}\)

Question 4825:

In which of the following is surface tension important?

A. The floating of a ship in water
B. The floating of a dry needle in water
C. The floating of a balloon in air
D. The diffusion of sugar solution across a membrane