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3 years ago

13

What is the wavelength of an earthquake wave if it has a speed of 9 km/s and a frequency of 15 Hz?

1 answer:

Dominik [7]3 years ago

7 0

The formula is wavelength=speed÷frequency so if you do 15÷9 which equals 1.6

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Consider a basketball player spinning a ball on the tip of a finger. If a player performs 1.99 J of work to set the ball spinnin

scoundrel [369]

To solve this problem it is necessary to apply the concepts related to rotational kinetic energy, the definition of the moment of inertia for a sphere and the obtaining of the radius through the circumference. Mathematically kinetic energy can be given as:

$KE= I\omega^2$

Where,

I = Moment of inertia

$\omega =$ Angular velocity

According to the information given we have that the radius is

$\Phi= 2\pi r$

$0.749m = 2\pi r$

$r = 0.1192m$

With the radius obtained we can calculate the moment of inertia which is

$I = \frac{2}{3}mr^2$

$I = \frac{2}{3}(0.624)(0.1192)^2$

$I = 5.91*10^{-3} kg \cdot m^2$

Finally, from the energy equation and rearranging the expression to obtain the angular velocity we have to

$\omega = \sqrt{\frac{2KE}{I}}$

$\omega = \sqrt{\frac{2(1.99)}{5.91*10^{-3}}}$

$\omega = 25.95rad/s$

Therefore the angular speed will the ball rotate is 25.95rad/s

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3 years ago

Name and describe two forces that act on your body as you walk down the hallway.

defon

Gravity & Resistance ?

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4 years ago

Our Sun undergoes slight orbital motion mostly due to the gravitational force exerted by Jupiter. If our solar system only conta

Sonja [21]

Answer:

it would be longer

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3 years ago

What is the term for the circular movement of material inside Earth's mantle?

Gala2k [10]

Answer:

convection currents is the answer

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3 years ago

If you walk 3 meters north and then 4 meters west, what is the magnitude of your displacement?

ankoles [38]

S^2=3^2+4^2
S^2=9+16
S^2=25
S=√25
S=5m

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3 years ago