balloon

007 - 008 Volume and surface area of earth and balloon

Example 007
A spherical balloon is inflated so that so that its diameter is 12 m. Find the surface area of the balloon’s covering and the volume of the gas.
 

39 - Rate of increase of angle of elevation of the line of sight

Problem 39
A balloon, leaving the ground 60 ft from an observer, rises 10 ft/sec. How fast is the angle of elevation of the line of sight increasing, after 8 seconds?
 

 
 
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