2 A torch uses four cells connected in series that provide a total potential difference of 6.0V. The power rating of the torch is 24W.
a What is the potential difference across one cell?
Tick one box.
• A 1.5V
B 3.0V -
C 12V
• D 24V

Alow cost, low earth orbit (leo) satellite is to be fabricated at a university, for subsequent launch by rocket. what are the constraints and objectives for selection of a material suitable for the satellite bus (i.e. the structure)? explain each in brief. (15 marks) b)suggest sources of data which could support the selection of materials for applications in space. (5 marks) c) set weights for the objectives listed in (2a) using the digital logic method. (5 marks)

When an object is heated it contracts. a. true b. false

Select all the correct answers. which three statements about electromagnetic radiation are true?