The force, F, acting on the wings of an aircraft moving through the air of velocity, v, and density, ρ, is given by the equation F = \(kv^xρ^yA^z\), where k is a dimensionless constant and A is the surface area of the wings of the aircraft. Use dimensional analysis to determine the values of x, y, and z.

In an experiment in which a molten substance is allowed to cool, the cooling curve above was obtained. The temperature 60°C is known as the

• A. vaporization point
• B. cooling temperature
• C. boiling point
• D. melting point

A body accelerates uniformly from rest at 2\(ms^{-2}\). Calculate its velocity when it has travelled a distance of 9m.

• A. 3.0\(ms^{-1}\)
• B. 4.5\(ms^{-1}\)
• C. 6.0\(ms^{-1}\)
• D. 18.0\(ms^{-1}\)

In the diagram below, if the magnetic field points into the paper and the force on a current - carrying conductor points upwards, what is the direction of the current?

• A) Upwards
• B) Downwards
• C) Right
• D) Left

A device used to prevent wearing away of the make and-brake contacts of an induction coil is called a\an

• A. fuse
• B. electroscope
• C. resistor
• D. capacitor

Two different materials, rubbed against each other acquired opposite charges when separated. This is an example of charging by

• A. induction
• B. friction
• C. conduction
• D. convection

Calculate the change in volume when 90g of ice is completely melted. [density of water = 1g cm^-3, density of ice = 0.9cm^-3]

• A. 0.00cm³
• B. 9.00cm³
• C. 10.00cm³
• D. 90.00cm³

A simple pendulum of length 0.4m has a period of 2s. What is the period a similar pendulum of length 0.8m at the same place?

• A. 8s
• B. 4s
• C. 2√2s
• D. √2s

The symbol illustrated below is that of a resistor?

• A. which absorb light
• B. which emits light
• C. which absorbs heat to function properly
• D. whose resistance is light dependent

An object weighs 22 kg in water and 30kg in air. what is the upthrust exerted by the liquid on the object.

[g = 10 ms²]

• A) 50 N
• B) 520 N
• C) 220 N
• D) 80 N