A student calibrates an unmarked liquid-in-glass thermometer. He places the thermometer bulb in ice at 0°C and marks the position of the end of the
liquid thread.
He then places the thermometer bulb in steam at 100°C and marks the position of the
end of the liquid thread.
(a) Explain why the student places the thermometer bulb in melting ice and in steam.
(1)
(b) Fig. 1.1 shows the thermometer next to a ruler.
Line A is the mark made when the thermometer bulb is in the ice.
Line B is the mark made when the thermometer bulb is in the steam.

Awoodchuck would chuck all the wood he could chuck if a woodchuck could chuck wood.

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction