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Umnica [9.8K]
3 years ago
13

Calculate the value of the error (only) with one decimal place for: (21+1-14%) x (14 +1-9%) Please enter the answer without +- s

ign
Physics
1 answer:
Brrunno [24]3 years ago
8 0

Answer:

 6.9.

Explanation:

In case of product of two physical quantities with errors , the rule is that the product will contain error equal to the sum of percentage errors of the two physical quantities. Foe example  P contains 2% error and Q contains 3% error then P X Q will contain 2 +3 = 5 % error.

(21 ± 1.14 %) x (14±1.9%)

Total percentage error in the result of product

1.14 + 1.19 = 2.33 %.

Produce value = 21 x 14 = 294

percent of error in it = 2.33%

value of error

= 2.33% of 294

= 6.8502 or 6.9.

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Answer:

W=50J

Explanation:

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\eta=\frac{W}{Q_{in}}

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3 years ago
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Darren drives to school in rush hour traffic and averages 28 mph. He returns home in mid-afternoon when there is less traffic an
Gala2k [10]

Answer:

distance between school and home is 21 miles

Explanation:

given data

in rush hour speed  s1 = 28 mph

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time t = 1 hr 15 min = 1.25 hr

to find out

distance  d

solution

we consider here distance home to school is d and t1 time to reach at school

we get here distance equation when we go home to school that is

distance = 28 × t1    .......................1

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so from equation 1 and 2

28 × t1 = 42 × ( 1.25 - t1 )

t1 = 0.75

so

from equation 1

distance = 28 × t1

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distance = 21 miles

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3 years ago
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