Express the following in its simplest form : 3xy (x3 / y4 )2 Answer:

An object of mass 5.0 kg falls vertically through still air. The air resistance acting on the object has a constant value of 50 N. Which of the following statements…

Element Z forms a stable ion Z3– which has the electron configuration 2,8,8. To which Group and Period of the Periodic Table does Z belong? Answer: 2) D The ion…

A person with cardiovascular disease is at risk of a heart attack. A blood clot may form in one of the arteries that supplies blood to the heart muscle. If…

A bar magnet is rotating at a constant rate of 120 revolutions per minute inside a circular coil of wire, causing an induced voltage across the coil. Which of the…

Diammonium hydrogen phosphate, (NH4)2HPO4, can be used as a fertiliser. The following equation shows how it can be synthesised:2NH3(g) + H3PO4(aq) → (NH4)2HPO4(s)What is the mass of diammonium hydrogen phosphate…

The diagram shows part of a DNA double helix being copied Which of the following statements, considered independently, is/are correct?1 The probability of any base in strand 2 being guanine…

The diameter XY of a circle has length d cm.O is a point on the circumference of this circle such that a new circle with centre O passesthrough points X…

A submarine uses sound of frequency 6000 Hz to locate obstructions ahead of it in the sea. A pulse of this sound reflects off an object that is 750 m…

The compounds BrCl and BrI melt at – 66 °C and 42 °C, respectively. What is the best explanation for this difference in melting points? Answer: