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Vera_Pavlovna [14]
3 years ago
8

What does this mean Atoms and elements are the basic back bone of the universe .

Physics
1 answer:
il63 [147K]3 years ago
8 0
It means every thing is made out of Atoms and some things are element componds so elements are the "backbone" of the compounds.
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A 310-km-long high-voltage transmission line 2.00 cm in diameter carries a steady current of 1,010 A. If the conductor is copper
Marizza181 [45]

Answer:

t = 166 years

Explanation:

In order to calculate the amount of years that electrons take to cross the complete transmission line. You first calculate the drift speed of the electrons by using the following formula:

v_d=\frac{I}{nqA}             (1)

I: current on the wire = 1,010A

n: free charge density = 8.50*10^28 electrons/m^3

A: cross-sectional area of the transmission line = π*r^2

r: radius of the cross-sectional area = 2.00cm = 0.02m

You replace the values of the parameters in the equation (1):

v_d=\frac{1,010A}{(8.50*10^{28}electron/m^3)(1.6*10^{-19}C)(\pi (0.02m)^2)}\\\\v_d=5.9*10^{-5}\frac{m}{s}

Next, you use the following formula:

t=\frac{x}{v_d}                     (2)

x: length of the line transmission = 310km = 310,000m

You replace the values of vd and x in the equation (2):

t=\frac{310,000m}{5.9*10^{-5}m/s}=5.24*10^9s

Finally, you convert the obtained t to seconds

t=5.24*10^9s*\frac{1\ year}{3.156*10^7s}=166.03\ years

The electrons take approximately 166 years to travel trough the complete transmission line

5 0
3 years ago
calculate the pressure exerted on the floor when a elephant who weighs 6000N stands on 1 foot which has a area of 20m
Roman55 [17]

Answer:

1500n

Explanation:

5 0
3 years ago
During light activity, a 70-kg person may generate 200 kcal
Lerok [7]

Answer:

2.75387\ ^{\circ}

Explanation:

m = Mass of person = 70 kg

c = Specific heat of human body = 0.83\ J/kg^{\circ}C

\Delta T = Change in temperature

Time taken is 1 hour

Heat is given by

Q=mc\Delta T\\\Rightarrow \Delta T=\dfrac{Q}{mc}\\\Rightarrow \Delta T=\dfrac{0.8\times 200\times 1}{70\times 0.83}\\\Rightarrow \Delta T=2.75387\ ^{\circ}C

The rise in temperature is 2.75387\ ^{\circ}C

3 0
3 years ago
Jimmy held the end of a metal bar over a fire while holding on to the opposite end. After a few minutes, the end he was holding
Pavel [41]

Answer:

A. Conduction

Explanation:

Conduction is the transfer of heat within the material itself, and he's holding the metal bar over the fire.

6 0
3 years ago
What happens to the atomic number of an atom when the number of neutrons in the nucleus of that atom increases? a It decreases b
kupik [55]

Answer:

It remains the same

Explanation:

It remains the same. This is because the number of protons doesn't change and the number of protons determines the atomic number.

8 0
2 years ago
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