Awell hole having a diameter of 5 cm is to be cut into the earth to a depth of 75 m. determine the total work (in joules) required to raise the earth material to the surface if the average mass of 1 m is 1830 kg. (data: g = 9.81 m/s) (hint: how much work is required to raise a volume of ad/4 x dx from a depth of x feet to the surface?

total work is 99.138 kJ

Explanation:

given data

diameter = 5 cm

depth = 75 m

density = 1830 kg/m³

to find out

the total work

solution

we know mass of volume is

volume =

volume =

so

work required to rise the mass to the height of x m

dw = gx dx

so total work is integrate it with 0 to 75

w =

w = × 0.05² × 1830× 9.81×

w = 99138.53 J

so total work is 99.138 kJ

explanation: magnetic pole, region at each end of a magnet where the external magnetic field is strongest. the south-seeking pole, or any pole similar to it, is called a south magnetic pole. unlike poles of different magnets attract each other; like poles repel each other.