III. Activity 1- Write the simple machine that is associated with each item. 1. cork screw
2. shoelaces
3. window blinds
4. jar lid
5. bottle cap
6. drill bit
7. Roller skates
8. crane
9. wishing well bucket
10. pizza cutter​

the answer would be..

b. sucking

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate

answer: zinc is the substance which has a volume of 1.38 .

density is defined as the mass of an object per unit volume.

it can be calculated by dividing mass of a substance by its volume i.e.

si unit of density is kg per cubic meter and cgs unit of the same is gram per cubic centimeter.

now from the given data volume can be calculated by the formula .

hence, the volume of aluminium will be = which comes out to be 1.703 .

similarly, volume of zinc, chromium, and nickel will be 1.378 , 0.869 , and 0.356 respectively.