a) The heated air inside a hot-air balloon weighs 5000 N. If the balloon support
ID: 2062017 • Letter: A
Question
a) The heated air inside a hot-air balloon weighs 5000 N. If the balloon supports a weight of 2000 N, what is the weight of the air displaced by the balloon?2000 N
3000 N
5000 N
7000 N
8000 N
b) A mixed drink consists of a mixture of alcohol and water. If the alcohol content of the drink exceeds a certain fraction, ice cubes will sink to the bottom of the glass rather than float. Estimate this fraction, using for the specific gravities of alcohol and ice the approximate values of 0.8 and 0.9, respectively.
Explanation / Answer
a) 2000N
Weight of the air replaced will be same as the supported weight.Because the Buoyancy force is equal to the weight replaced of the fluid.
b) let's assume x of water and y of alcohol
=> xvg + 0.8yvg = 0.9vg => x+0.8y = 0.9
and x+y =1
=> x = 0.5, y= 0.5
=> fraction =x/y = 1
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