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son4ous [18]
3 years ago
9

Time intervals measured with a stopwatch typically have an uncertainty of about 0.2 s, due to human reaction time at the start a

nd stop moments. What is the percent uncertainty of a handmaid measurement of (a) 5s, (b) 50s, (c) 5 min
Mathematics
1 answer:
SashulF [63]3 years ago
6 0

Answer:

a) 8%

b) 0,8%

c) 0,1333%

Step-by-step explanation:

To calculate percentage uncertainty, you need to take the lowest possible value you can get (4,8s using a) as an example) and calculate the percentage of that.

(4,8/5)*100= 4%

This however is not the end, because there is the possibility of getting 5,2s as an answer. Hence the answer of 4% needs to be doubled.

Therefore, the answer for a) is (4%*2)= 8%

The same principle can be applied to figure out the answers for b) and c). In c), remember to convert 5 minutes to 300 seconds to avoid confusion between units of time.

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15 points work out ratio for x
BlackZzzverrR [31]

Answer:

x = 25

Step-by-step explanation:

x : (x+10) = 5:7

Fractional form

x / x+10 = 5/7

Cross multiply:

x * 7 = (x+10) * 5

7x = 5x + 50

7x - 5x = 5x + 50 - 5x

2x = 50

x = 25

Check:

25 : 25 + 10

25 : 35

25/35 = 5/7

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