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konstantin123 [22]
3 years ago
8

How many SF does number 0.00403 have?

Physics
1 answer:
snow_tiger [21]3 years ago
6 0
The answer is two (4 -3)
Zero is not a SF
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A power plant produces 1000 MW to supply a city 40 km away. Current flows from the power plant on a single wire of resistance 0.
nikitadnepr [17]

Answer:

Current = 8696 A

Fraction of power lost = \dfrac{80}{529} = 0.151

Explanation:

Electric power is given by

P=IV

where I is the current and V is the voltage.

I=\dfrac{P}{V}

Using values from the question,

I=\dfrac{1000\times10^6 \text{ W}}{115\times10^3\text{ V}} = 8696 \text{ A}

The power loss is given by

P_\text{loss} = I^2R

where R is the resistance of the wire. From the question, the wire has a resistance of 0.050\Omega per km. Since resistance is proportional to length, the resistance of the wire is

R = 0.050\times40 = 2\Omega

Hence,

P_\text{loss} = \left(\dfrac{200000}{23}\right)^2\times2

The fraction lost = \dfrac{P_\text{loss}}{P}=\left(\dfrac{200000}{23}\right)^2\times2\div (1000\times10^6)=\dfrac{80}{529}=0.151

3 0
3 years ago
Wheat ground into flour is an example of a ___ change?
EleoNora [17]

Oml... Its physical... Unless if your turning that wheat into bread by using fire it would be chemical.






Yeeeeeeeetus


6 0
3 years ago
How many birds have tested positive for West Nile virus?
snow_lady [41]
I believe the last time the dead bird count was updated (12/16/16), there is a count of 1,350 dead birds. There is 1,350 dead birds from 33 countries have tested positive for WNV in 2016.
5 0
3 years ago
a basketball is tossed upwards with a speed of 5.0 m/s What is the maximum height reached by the basketball from its release poi
den301095 [7]

Answer:

1.275 m

Explanation:

Let the maximum height reached be h.

Here initial velocity, u = 5 m/s

Final velocity, V = 0

Use third equation of motion

V^2 = u^2 + 2 g h

0 = 25 - 2 × 9.8 × h

h = 25/19.6 = 1.275 m

3 0
3 years ago
Read 2 more answers
When an electron loses or gains a charge, it becomes?​
suter [353]

Answer:

It becomes an Ion with either positive or negative charge

6 0
3 years ago
Read 2 more answers
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