(a) Since V=(4/3)Pi*r^3, differentiating wrt "t" gives: dV/dt=4pi*r^2*dr/dt, substituting . r=2 cm, dV/dt=-8 cm^3/sec, we get -8=4pi*4*dr/dt ===> dr/dt=-1/(2pi) cm/sec or approx. -0.16 cm/sec (b)
Dear Paolo: Is it true that the expression/phrase "to be shot dead" has become old-fashioned and, therefore, is rarely used in everyday English? Is it really so? By the way, is it an "expression"
Dear Paolo: Do the sentences below make sense in English? >I'll make my way in. >I'll make my way out. If so, when do you use them? *** Yes, they make sense. You use them when you want
Dear Paolo: When a guests enters or leaves a new place, is it correct from the host to say, "I'll lead your way in" and "I'll leave your way out"? *** The first expression is correct. The second
Dear Paolo: Are there other ways to express the concept below? What about "to be through to the final of a competition"? To reach the final of a competition *** I don't like "to be through to