What gauge pressure is required in the city water mains for a stream from a fire hose connected to the mains to reach a vertical height of 15.0 m

The gauge pressure is equal to 147 kPa.

Explanation:

The pressure exerted by fluid is given by :

Where

is density of water

h is height

So, put all the values,

or

P = 147 kPa

So, the gauge pressure is equal to 147 kPa.

0.93xc=0.93x3x10^8m/s

2.54cm is 1 inch

360seconds i 1 hr

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.