3 years ago

Help! How do you find the Eccentricity??

1 answer:

8 0

Explanation:

The formula to determine the eccentricity of an ellipse is the distance between foci divided by the length of the major axis

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8. If the speed of a wave is 1500 m/s and its frequency is 200 Hz, what is the wavelength?

sammy [17]

formula for wavelength = speed/frequency

So 1500/200 = 7.5 meters

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3 years ago

A girl on a spinning amusements park is 12m from the center of the ride and has a centripetal acceleration of 17 m/s^2. What is

Tanya [424]

Answer: 14.28 m/s

Explanation:

Assuming the girl is spinning with uniform circular motion, her centripetal acceleration $a_{c}$ is given by the following equation:

$a_{c}=\frac{V^{2}}{r}$ (1)

Where:

$a_{c}=17 m/s^{2}$ is the centripetal acceleration

$V$ is the tangential speed

$r=12 m$ is the radius of the circle

Isolating $V$ from (1):

$V=\sqrt{a_{c}r}$ (2)

$V=\sqrt{(17 m/s^{2})(12 m)}$

Finally:

$V=14.28 m/s$ This is the girl's tangential speed

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Need physics help ASAP please taking test

sattari [20]

Answer:

the answer is d :)

Explanation:

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Which answer shows a balanced nuclear equation for the alpha decay of plutonium-239

Sergio [31]

Answer: An alpha particle is a helium-4 nucleus, it contains gwo protons and two neutrons. So, alpha decay, giving off an alpha particle, does the following:

1)reduces the atomic number (number of just protons) by two. Plutonium has atomic number of 94, take two protons away and you are left with 92 which corresponds to uranium.

2) reduces the mass number (protons plus neutrons) by 4. If you start with 239 and subtract two protons and two neutrons, you are left with 235.

Explanation:

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Explanation:

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