3 years ago

How to determine how hot or cold a star is?

1 answer:

4 0

If a star is a brilliant blue color, it's really hot and emits a lot of energy. If it's red, it has a cool surface temperature instead. Therefore, the dominant wavelength of a star's light can tell us its surface temperature.

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He is the chemical symbol for which element? Select one: a. hydrogen b. hassium c. helium d. hafnium

Ludmilka [50]

The answer is C . Helium

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4 years ago

Which measure of central tendency refers to the average of all the scores in a data set?

dedylja [7]

Answer

Mean

Explanation

For any set of date there is a typical value for the probability distribution called central tendency.

There three types of central tendency mean, median and mode.

Mean is the average value of all data set in a distribution.

median is the the central value when the data is arranged in ascending or descending order.

Mode is the value that occurs most in a set of data.

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4 years ago

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What is the force of gravity between two 50.0kg masses that are separated by 0.300m?3.71x10-8N5.59x10-7N2.78x104N1.85x10-6N

Varvara68 [4.7K]

We will have the following:

$\begin{gathered} F=G\frac{m_1m_2}{r^2}\Rightarrow F=\frac{(6.67\ast10^{-11}m^3\ast kg^{-1}\ast s^{-2})(50kg)(50kg)}{(0.3m)^2} \\ \\ \Rightarrow F=1.852777778...\ast10^{-6}N\Rightarrow F\approx1.85\ast10^{-6}N \end{gathered}$

So, the force is approximately 1.85*10^-6 N.

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1 year ago

An EM wave has a speed of 3 x 10 ^ 8 m/s and a wavelength of 6 x 10 ^ -7 m. What is the frequency of the wave? 90 Hz 180 Hz 2 x

arsen [322]

F = 3x10^8m/s / 6x10^-7m = Hz

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3 years ago

¿ qué es un motor de explosión?

ArbitrLikvidat [17]

Answer:

es un motor de combustión interna con encendido por chispa.

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3 years ago