The equation that relates the voltages and the number of turns in a transformer is

where

is the voltage in the secondary coil,

is the voltage in the primary coil, and

and

are the number of turns on the secondary and primary coils.
Using the numbers, we find the ratio between the number of turns:
<em>The sensitivity of a mercury thermometer can be increased by using a smaller mercury bulb, thinner wall and smaller bore. A smaller bulb contains less mercury and hence absorbs heat in shorter time. As a result it can response faster to temperature change.</em>
Work done = Potential Energy = (mg)h
mg = weight of the ball
= 1000 N * 2.5 m = 2500 Joules.
The work done during the 5 second is 2500 Joules.