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marusya05 [52]
3 years ago
8

If a stone with an original velocity of zero is falling from a ledge and takes eight seconds that it the ground what is the fina

l velocity at the stone
Physics
1 answer:
Natalka [10]3 years ago
6 0

Answer: 78.4 m/s

The formula for speed using known acceleration:

v=at+v_0=gt+v_0

where the initial velocity v0 = 0 in this case, g is the gravitational acceleration and t is given to be 8 seconds, so:

v = 9.8  \frac{m}{s^2}\cdot 8 s=78.4 \frac{m}{s}

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When a solid is in the process of changing into a liquid and extra energy is added to the system, the temperature does not chang
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Answer:

D. The temperature does not change during a phase change because the average kinetic energy does not change. Therefore, the potential energy in the bonds between molecules must change.

Explanation:

When there is a change of state (for example, from solid into a liquid, as in this example), when energy is added to the system, the temperature of the substance does not change.

The reason for this is that the energy supplied is no longer used to increase the average kinetic energy of the particle, but instead it is used to break the bonds between the different particles/molecules. For instance, since in this case the substance is changing from solid to liquid, all the energy supplied during the phase change is used to break the bonds between the molecules of the solid: when the process is done, all the molecules will be free to slide past each other, and the substance has turned completely into a liquid.

The bonds between molecules store potential energy: therefore, this means that the energy supplied during the phase change is not used to change the kinetic energy, but to change the potential energy in the bonds between the molecules.

7 0
3 years ago
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A child pulls a sled up a snow covered hill. If the child does 504J of work on the sled while pulling the sled 23m up the hill t
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Explanation:

ans is equal to 504j* 23 m* 10 ms

7 0
2 years ago
The capacitance of A conductor is affected by the presence of A second conductor that is uncharged and isolated electrically. Wh
Komok [63]
What happens is the potential value of the conductor decreases due to the presence of second conductor
as the capacitance is given by C = q/v
the value of v deceases as v-v1
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3 years ago
Calculate the net force being applied to the objects. Include SIZE and DIRECTION.
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If the radius of the sun is 7.001×105 km, what is the average density of the sun in units of grams per cubic centimeter? The vol
xenn [34]

Answer:

Average density of Sun is 1.3927 \frac{g}{cm}.

Given:

Radius of Sun = 7.001 ×10^{5} km = 7.001 ×10^{10} cm

Mass of Sun = 2 × 10^{30} kg = 2 × 10^{33} g

To find:

Average density of Sun = ?

Formula used:

Density of Sun = \frac{Mass of Sun}{Volume of Sun}

Solution:

Density of Sun is given by,

Density of Sun = \frac{Mass of Sun}{Volume of Sun}

Volume of Sun = \frac{4}{3} \pi r^{3}

Volume of Sun = \frac{4}{3} \times 3.14 \times [7.001 \times 10^{10}]^{3}

Volume of Sun = 1.436 × 10^{33} cm^{3}

Density of Sun = \frac{ 2\times 10^{33} }{1.436 \times 10^{33} }

Density of Sun = 1.3927 \frac{g}{cm}

Thus, Average density of Sun is 1.3927 \frac{g}{cm}.

4 0
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