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Problems in Mathematical Analysis.pdf - pwp.net.ipl.pt

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ITS<br />

formula<br />

Def<strong>in</strong>ite Integrals \Cfi. 5<br />

= . ff'.<br />

where t is the time that elapses and g is the acceleration of gravity.<br />

At what distance from the <strong>in</strong>itial position will the body<br />

be <strong>in</strong> t seconds from the time it is thrown?<br />

1752. The velocity of a body thrown vertically upwards with<br />

<strong>in</strong>itial velocity v (air resistance allowed for) is given by the<br />

formula<br />

where t is the time, g is the acceleration of gravity, and c is<br />

a constant. F<strong>in</strong>d the altitude reached by the body.<br />

1753. A po<strong>in</strong>t on the x-axis performs harmonic oscillations<br />

about the coord<strong>in</strong>ate orig<strong>in</strong>; its velocity is given by the formula<br />

where t is the time and t; , co are constants.<br />

F<strong>in</strong>d the law of oscillation of a po<strong>in</strong>t if when / = it had<br />

an abscissa * = 0. What is the mean value of the absolute magnitude<br />

of the velocity of the po<strong>in</strong>t dur<strong>in</strong>g one cycle?<br />

1754. The velocity of motion of a po<strong>in</strong>t is v = te~"' Qlt<br />

m/sec.<br />

F<strong>in</strong>d the path covered by the po<strong>in</strong>t from the commencement of<br />

motion to full stop.<br />

1755. A rocket rises vertically upwards. Consider<strong>in</strong>g that when<br />

the rocket thrust is constant, the acceleration due to decreas<strong>in</strong>g<br />

weight of the rocket <strong>in</strong>creases by the law /==^~^ (a ftf >0),<br />

f<strong>in</strong>d the velocity at any <strong>in</strong>stant of time /, if the <strong>in</strong>itial velocity<br />

is zero. F<strong>in</strong>d the altitude reached at lima / = / r<br />

1756*. Calculate the work that has to be done to pump the<br />

water out of a vertical cyl<strong>in</strong>drical barrel with base radius R and<br />

altitude H.<br />

1757. Calculate the work that has to be done <strong>in</strong> order to pump<br />

the water out of a conical vessel with vertex downwards, the<br />

radius of the base of which is R and the altitude H.<br />

1758. Calculate the work to be done <strong>in</strong> order to pump water<br />

out of a semispherical boiler of radius R = 10 m.<br />

1759. Calculate the work needed to pump oil out of a tank<br />

through an upper open<strong>in</strong>g (the tank has the shape of a cyl<strong>in</strong>der<br />

with horizontal axis) if the specific weight of the oil is y, the<br />

length of the tank H and the radius of the base R.<br />

1760**. What work has to be done to raise a body of massm<br />

from the earth's surface (radius R) to an altitude ft? What is<br />

the work if the body is removed to <strong>in</strong>f<strong>in</strong>ity?

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