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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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The diagram represents a reduction of a triangle by using a scale factor of 0.8.
Alekssandra [29.7K]

Answer:

4.8 inches

Step-by-step explanation:

<em>See comment for complete question</em>

Represent the larger triangle with 1 and the smaller with 2.

So, we have:

H_1 =6\ in -- height of 1

Required

Determine H2 --- Height of 2

To do this we apply dilation formula.

Original * Scale\ Factor = New

In this case:

H_1 * Scale\ Factor = H_2

Substitute 6 for H1 and 0.8 for Scale Factor

6* 0.8 = H_2

4.8= H_2

Hence, the height of the smaller triangle is 4.8 inches

3 0
3 years ago
Two number differ by 3 The sum of their reciporcal is 7/10 find tge numbers
motikmotik
The numbers are 5 and 2.

Reciprocals: 5- 5/10
                     2- 2/10
(2/10)+(5/10)= 7/10
5-2= 3
 
Answer: 5 and 2
6 0
3 years ago
Read 2 more answers
Of the 22 students in the class, 16 of them are boys.
Eddi Din [679]
22 students...16 boys

probability student will be a boy is 16/22 which reduces to 8/11 or 72.7%
6 0
3 years ago
LETTERS How many permutations are possible of the letters in the word numbers?
Temka [501]
the answer is 5 hope it helps
8 0
3 years ago
Read 2 more answers
Can someone remind me how to do this again?
Morgarella [4.7K]

Answer:

This the formula for the Pythagorean Theorem.

Step-by-step explanation:

This is the formula for the Pythagorean Theorem but its written in a different way but it will give you the same answer.

So first you will be given two sides which will be represented as leg a and leg b.

So you would plug in the two numbers in the equation c = square root of 18^2 + 12^2

Now you would find 18^2 which equals 324

Then you would find 12^2 which equals 144

Add them together and get 468

To get what c equals or the hypotenuse you have to find the square root of 468.

The square root of 468 is 21.633 but you round it to the nearest tenth and get 21.6

5 0
3 years ago
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