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The washing up liquid turns blue because pH of liquid is greater than 7.
<h3>What is pH?</h3>
pH is a measures how much water is acidic/basic in nature. The range o pH is 0 - 14. The pH value of 7 represents neutral. pH less than 7 is acidic nature. pH greater than 7 shows a base.
Sharna mixed cabbage water with colourless washing up liquid, the mixture turned blue.
Cabbage contains anthocyanin which changes color when it is mixed with an acid or a base. The pigment turns bluish-green in a pH greater than 7.
Thus, The washing up liquid turns blue because pH of liquid is greater than 7.
Learn more about pH.
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Answer:
h = 12.8 cm
Explanation:
from the equation we are given the following:
distance = 6.4 cm
- when the object is being lowered the weight is equal to the spring force
weight = spring force
mg = ky ... equation 1
- potential energy to stretch a spring = work done by the spring
mgh = 0.5 x k x h^{2} ....equation 2
- substituting equation 1 into equation 2
kyh = 0.5 x k x h^{2}
y = 0.5 x h
2y = h
- where y = 6.4 , the maximum elonf=gation becomes
h = 2 x 6.4 = 12.8 cm
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