fun

Which is the value of a vector quantity?

• 200 V

• 300 J

• 20 m/s east

• 500 m/s

A force acts on an area to produce a pressure. Which changes produce the same pressure?

• double the area and double the force

• double the area and halve the force

• double the area and make the force four times bigger

• halve the area and double the force

One end of a copper rod is heated. What is one method by which thermal energy is transferred in the copper rod?

• Free electrons transfer energy from the cooler to the hotter end

• Free electrons transfer energy from the hotter to the cooler end

• Molecules of copper mover from the cooler end to the hotter end

• Molecules of copper move from the hotter end to the cooler end

To mark a temperature scale on a thermometer, standard temperatures known as fixed points are needed. Which of these is a fixed point on the Celsius scale?

• room temperature

• the temperature inside a freezer

• the temperature of pure melting ice

• the temperature of pure warm water