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4 years ago

10

10. Define and give 2 examples of kinetic energy. Be sure to include the two factors that make an object’s kinetic energy increa

se.

1 answer:

Mademuasel [1]4 years ago

7 0

You can describe kinetic energy and the potential energy of motion to get your answer.

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Provided following are four different ranges of stellar masses. Rank the stellar mass ranges based on how many stars in each ran

elena-s [515]

Highest to lowest number:

-less than 1 solar mass

-between 1 and 10 solar masses

-between 10 and 30 solar masses

-between 30 and 60 solar masses

<h3>What is Stellar masses ?</h3>

Stellar mass is a phrase that is used by astronomers to describe the mass of a star.

It is usually enumerated in terms of the Sun's mass as a proportion of a solar mass ( M ☉). Hence, the bright star Sirius has around 2.02 M ☉.

Stellar masses are not fixed, although they change for single stars only on long periods.

Learn more about Stellar masses here:

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2 years ago

For what absolute value of the phase angle does a source deliver 71 % of the maximum possible power to an RLC circuit

kherson [118]

Answer: the absolute value of the phase angle is 28°

Explanation:

taking a look at expression for the instantaneous electric power in an AC circuit;

P = VI -------let this be equation 1

p is power, v is voltage and I is current;

for maximum power

P_max = V_rms × I_rms --------let this be equ 2

where P_max is the maximum power, V_rms is the rms value of voltage and I_rms is the rms value of current.

Also for average electric power in an AC circuit

P_avg = V_rms × I_rms × cos²∅ -------let this be equ 3

where P_avg is the average power and cos∅ is the power factor

now from equation 2; P_max = V_rms × I_rms

so p_max replaces V_rms × I_rms in equation 3

we now have

P_avg = P_max × cos²∅

so we substitute

expression for the given value of the average power is

P_avg = P_max × 75%

p_avg = P_max.78/100

for the expression of the average electricity in an AC circuit

P_max.78/100 = P_max × cos²∅

78/100 = cos²∅

to get the absolute value of phase angle

∅ = cos⁻¹ ( √(78/100))

∅ = cos⁻¹ ( 0.8832)

∅ = 27.969 ≈ 28°

Therefore the absolute value of the phase angle is 28°

8 0

3 years ago

The region around a magnet where the magnetic force is exerted is known as

Olenka [21]

<span>The region around a magnet where the magnetic force is exerted is known as the </span>magnetic field.

5 0

3 years ago

What causes a hurricane to lose energy when it moves onto land?

s2008m [1.1K]

I know that in order for a hurricane to gain energy, it needs water and warm air and since hurricanes form in the water due to thunder storms near Africa, it loses energy because there is not much water on land than it is in the ocean or sea. :)

5 0

4 years ago

A wire of resistivity rhorho must be replaced in a circuit by a wire of the same material but 4 times as long. If, however, the

kap26 [50]

The resistivity of a wire is given by:

$R=\rho\frac{l}{\pi r^2}$

Where $\rho$ is the electrical resistivity of the wire, $l$ is the length of the wire and r is the radius os the wire, Recall that $r=\frac{d}{2}$ . So:

$R=\rho\frac{l}{\pi(\frac{d}{2})^2}\\R=4\rho\frac{l}{\pi d^2}$

We have $l'=4l, \rho'=\rho, R'=R$ . Thus:

$R'=4\rho'\frac{l'}{\pi d'^2}\\R=4\rho\frac{4l}{\pi d'^2}\\4\rho\frac{l}{\pi d^2}=4\rho\frac{4l}{\pi d'^2}\\\frac{1}{d^2}=\frac{4}{d'^2}\\d'^2=4d^2\\d'=2d$

The diameter of the new wire must be twice of the original wire.

5 0

3 years ago