There is constriction made in a clinical thermometer, why?

The constriction in the thermometer is to prevent the mercury from dropping back to the bulb when the reading is being taken. ... It prevents the thermometric substance (Mercury or Alcohol) from running back into the bulb.

Explanation:

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

not too sure thinking all accelerations are pointed down