A thermal tape used in certain Apparatus consists of silica rod which tightly fits inside an aluminium tube whose internal diameter is 8 millimetre at zero degree Celsius. When the temperature is raised, the fit is no longer exact, calculate what change in temperature is necessary to produce a channel whose cross section equal to that of a tube 1 millimetre internal diameter.​

laticia draws the diagram below to show earth’s magnetic field.

answer

the arrows to the right of earth should point up.

the components of a vector are the parts of the vectors that are to each other.

b perpendicular

80cm/s.

24cm/s.

53.3cm/s.

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.