According to the rules for significant figures, simple decimal subtraction is done. But since 15.54 is only accurate to the hundredths place, then the resulting difference should also be rounded off to the nearest hundredths. This is shown below:
508.9538 - 15.54 = 493.4138
Rounding off to the nearest hundredths:
= 493.41
<u>Answer</u>
3 Ohms
<u>Explanation</u>
when the resistors are in series, the resistance in the circuit increases. For example, if two resistors, R1 and R2 are in series, the combined resistance is R1+R2.
When connected in parallel, the total resistance is the reciprocal of (1/R1 + 1/R2)
In this case the resistors are in parallel.
Total resistance = (1/12 + 1/4)⁻¹
= (1/3)⁻¹
= 3 Ohms
Explanation:
The given data is as follows.
Dry mass of soil (
) = 
= 500 g
= jar + soil + water = 1697 g
= weight of jam + water = 1390 g
= bottle + dry soil
= weight of empty bottle
Formula to calculate specific gravity is as follows.
Specific gravity = 
= 
= 
= 
= 2.59
Thus, we can conclude that value of bulk specific gravity (SSD) of the sand is 2.59.
Answer:
is the distance from the obstacle of reflection.
wavelength 
Explanation:
Given that:
- frequency of sound,
- time taken for the echo to be heard,
- speed of sound,
We know,
<em>During an echo the sound travels the same distance back and forth.</em>
is the distance from the obstacle of reflection.
<u>Now the wavelength of sound waves:</u>
Answer:
potential energy =mgh
potential energy = 3×10×30
potential energy=900J
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