Unless otherwise posted, what is the speed limit for cars in a residential area? _

a) 20 mph
b) 25 mph
c) 30 mph

Suppose you use a machine that gives you a mechanical advantage of 2 to achieve an output force of 30newtons what must the input force be

What is meant by the statement" the melting poin of glycerine is 13 degree celsius

The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water