2 years ago

Explain why gravity is the only force acting on a falling ball

1 answer:

4 0

Answer:

Gravity is the only force acting on a falling ball because of free fall. Since gravity is unbalanced it accelerates an object and the velocity increases as an object falls due to gravity pushing it. The acceleration due to gravity is 9.8 m/s^2.

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A metallic wire has a diameter of 4.12mm. When the current in the wire is 8.00A, the drift velocity is 5.40×10−5m/s.What is the

podryga [215]

Answer:

$6.9\times 10^{28}m^{-3}$

Explanation:

We are given that

Diameter of wire=d=4.12 mm

Radius of wire=r $r=\frac{d}{2}=\frac{4.12}{2}=2.06mm=2.06\times 10^{-3} m$

$1mm=10^{-3} m$

Current=I=8 A

Drift velocity= $v_d=5.4\times 10^{-5} m/s$

We have to find the density of free electrons in the metal

We know that

Density of electron= $n=\frac{I}{v_deA}$

Using the formula

Density of free electrons= $\frac{8}{5.4\times 10^{-5}\times 1.6\times 10^{-19}\times 3.14\times (2.06\times 10^{-3})^2}$

By using Area of wire= $\pi r^2$

$\pi=3.14\\e=1.6\times 10^{-19} C$

Density of free electrons= $6.9\times 10^{28}m^{-3}$

3 0

2 years ago

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A star is measured to be 18.9 light years from earth. what is the correct answer in the calculation shown below? (consider both

Lapatulllka [165]

A light year is a measurement of distance that is used in the space. It is the distance that a light traveled for 1 year on Earth or 365 days on Earth at a speed of 3 x 10^8 meters per second. To convert the units from light year to the SI unit meters, we simply make use of the definition of the unit. We do as follows:

18.9 light years ( 365 days / 1 light year ) ( 24 h / 1 day ) ( 3600 s / 1h ) ( 3 x 10^8 m/s) = 1.79 x 10^17 meters

Therefore, 18.9 light years is equal to 1.79 x 10^17 meters.

4 0

2 years ago

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A nuclear power plant, a hydroelectric dam, a coal burning power plant have what in common? A) They are all sources of fuel. B)

Rudik [331]

B) They are all sources of electricity

Hope it helps!!

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3 years ago

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Which frequencies can humans can hear but not mice

Blizzard [7]

Of approximately 1 to 4 kHz6 and approximately 16 kHz for mice.

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2 years ago

Assume that charge −q is placed on the top plate, and +q is placed on the bottom plate. what is the magnitude of the electric fi

jenyasd209 [6]

<span>B?) Electric field E = q / (εo*A)

C) V = E*d = q*d / (εo*A)

D) V = q / C
so C = q / V = q * 1/V = q*εo*A / q*d = εo*A / d

I hope this helps! ^_^
</span>

5 0

2 years ago