3. me(2 mkandle
The diagram below shows the essential features of a solar heating panel. A small electric pump circulates the
liquid through the pipes.
Glass plate
Metal plate
Pipes
Air space
Material fibre glass
State briefly why:
The pipes and metal plates are blackened.
(ii) There is a material fibre glass on the panel.
(1mk)
(1mk)​

The drag force, fd, imposed by the surrounding air on a vehicle moving with velocity v is given by fd = cdaρv 2/2 where cd is a constant called the drag coefficient, a is the projected frontal area of the vehicle, and ρ is the air density. an automobile is moving at v = 80 kilometers per hour with cd = 0.28, a = 2.3 m2, and ρ = 1.2 kg/m3.