1) A fask has the following features;
a plastic stopper
glass walls with silver coating on both sides
vacuume between walls
plasic spacer
Which features of the flask reduce energy transfer by:
a) radiation
b) conduction
c) convection
2) Many vacuume flasks have steel walls instead of glass.
a) How would this affect how fast some hot coffee cools?
b) Why do you think steel is used instead of glass?
3) Would the flask keep a cold drink cold on a hot day? Explain your answer.
4) A solar panel for heating water has the following features;
a frame
glass cover
rigid foam
copper pipes
copper plate, painted black on top
aluminium plate
fibreglass insulation
Explain the design of the solar panel that are intended to:
a) Let infrared radiation go through
b) Absorb infrared radiation
c) Reflect infrared radiation.
5) Explain why a desert fox's large ears help to keep it cool.
6) Describe two adaptations the artic fox has for living in a cold climate.
7) Explain why air moving over a object can increase its rate of cooling.
8) Explain how and why partsd of the solar panel are designed to reduce heat transfer by convection, conduction and radiation.
3 answers