1. To walk on water, all you need is a pair of water-walking boots shaped like b
ID: 1479976 • Letter: 1
Question
1. To walk on water, all you need is a pair of water-walking boots shaped like boats. If each boot is 28 cm high and 34 cm wide, how long must they be to support a 80 kg person?
*Please answer in cm.
2a. A block of wood floats on water. A layer of oil is now poured on top of the water to a depth that more than covers the block, as shown in the figure(Figure 1) . Is the volume of wood submerged in water greater than, less than, or the same as before?
Choices: greater, less, or the same?
2b. If 95 % of the wood is submerged in water before the oil is added, find the fraction submerged when oil with a density of 880 kg/m^3 covers the block.
Explanation / Answer
1.
weight of person must be balanced by buoyant force
m*g = volume of boot * density of water * g
m= volume of boot * density of water
80 Kg = (0.28*0.34*L) * (1000)
L = 0.84 m
= 84 cm
Answer: 84 cm
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