(11)
if the motorbike is driven at the sum upuu
marks)
2.
the diagram shows two children playing with a toy called a swing ball. the ball is joined to
a pole by a strong string. the children hit the ball so that it goes round in a circular path.
air
resistance
tension
weight
circular path
of swing ball
(a)
name the force labelled in the diagram that causes the ball to move in a circle? (1)
(b) choose the correct response:
(1)
the force needed to make the ball move in a circular path is larger if
a) the speed of the ball is increased.
b) the speed of the ball is decreased.
c) the string is made longer.

Stage in which a star’s outer layers have started to cool and grow outward?

An object displaces 652 ml of water. the volume of the object is: 0.652 cm³ 6.52 cm³ 65.2 cm³ 652 cm³

One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(ii) carbonate, in concentrated sulfuric acid. the sulfuric acid reacts with the copper(ii) carbonate to produce a blue solution of copper(ii) sulfate. scrap iron is then added to this solution, and pure copper metal precipitates out because of the following chemical reaction: (s) (aq) (s) (aq) suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. he adds powdered iron to a copper(ii) sulfate sample from the plant until no more copper will precipitate. he then washes, dries, and weighs the precipitate, and finds that it has a mass of .