Awashbasin has an exit pipe covered with a plug of area 12 cm²
a chain is attached to the
centre of the plug to assist in pulling the plug away from the exit hole. the washbasin contains
water to a depth of 0.080 m.
the density of the water is 1000 kg /m³

what is the force acting on the plug due to the water?
a 0.96n b 800n c 9600n d 80 000n
the answer is a, but how is it worked out?

Amachinist needs to remove a tight fitting pin of material a from a hole in a block made of material b. the machinist heats both the pin and the block to the same high temperature and removes the pin easily. what statement relates the coefficient of thermal expansion of material a to that of material b? a) the situation is not possible, heating block b will shrink the hole in the material as the material expands with increasing temperatureb) material b has the same coefficient of expansion as does material ac) material b has a negative coefficient of expansion and a has a positive coefficient of expansiond) material a has a greater coefficient of expansion than does material be) material b has a greate

Critical mass is the of material required to produce a chain reaction. a.) minimum amount b.) atomic mass c.) precise amount d.) maximum amount

How will the system respond to a temperature increase?