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3 years ago

1.

Physics

1 answer:

Lerok [7]3 years ago

7 0

1. Light waves are one type of electromagnetic wave.

2. Sound is an example of a mechanical wave.

3. A mechanical wave requires a medium.

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A 75.5 kg diver drops from a diving board 10.0 m above the waters surface. Find the divers speed just before he strikes the wate

jenyasd209 [6]

Answer:

Explanation:

<u>Mechanical Energy </u>

The kinetic energy of a body (K) is the capacity of doing work due to its speed. It can be expressed as

$\displaystyle K=\frac{mv^2}{2}$

The potential energy (U) is the capacity of doing work due to its height respect to a certain reference level.

$U=mgh$

The mechanical energy is the sum of both

$\displaystyle E_m=\frac{mv^2}{2}+mgh$

The principle of conservation of mechanical energy states it must remain the same if no external force is acting on it. The diver drops from the diving board, which means its initial speed is zero (and so its initial kinetic energy). Thus, the mechanical energy at the jumping time is

$\displaystyle E_m=mgh=(75)(10)(9.8)=7350\ J$

When the diver is about to get into the water, his height reaches zero and the speed is at maximum. All the potential energy became kinetic energy, so

$\displaystyle \frac{mv^2}{2}=7350\ J$

Rearranging

$\displaystyle v^2=\frac{2(7350)}{75}=196$

$v=\sqrt{196}=14\ m/s$

The final speed of the diver is

$\boxed{v=14\ m/s}$

8 0

3 years ago

When two oceanic plates collide, it creates _____.

jonny [76]

At the subduction zone a very deep trench is formed in the ocean floor. Oceanic and oceanic plate convergence result in the formation of volcano chains. The crust that is pulled under or subducted melts to form magma. This magma rises to the top of the overriding oceanic plates and erupts on the ocean floor.
So the answer would be Volcano

5 0

3 years ago

Read 2 more answers

What is the final temperature if it requires 5000 J of heat to warm 2.38892 x10-2 kg of water that starts at 5oC? Remember Cp fo

Tanya [424]

Explanation:

Hi ythere sorry do not know

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3 years ago

Help please, what does gravitational force do according to these answer choices?

laiz [17]

Answer:

the answer is C

Explanation:

gravity forces down not up or sideways.

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3 years ago

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kumpel [21]

the branch of optics that studies interference, diffraction, polarization, and other phenomena for which the ray approximation of geometric optics is not valid.

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2 years ago