Could anyone help me with this?

HURRY

Mrac [35]

Answer:

It’s b

Explanation:

Everyone else is wrong and I tried this and got it right

6 0

3 years ago

Read 2 more answers

Two stars in a faraway part of the Milky Way are orbiting each other as a binary star system. By

natita [175]

Answer: $M_{total}=$ 1.85

Explanation: Estimate the total mass of a binary system is done by a reformulation of <em>Kepler's Third Law</em>, which states that the square of the period of a planet's orbit is proportional to the cube of its semimajor axis, i.e.:

$a^{3}=(M_{1}+M_{2})P^{2}$

where

a is semimajor axis in astronomical units (AU);

P is period measured in years;

$M_{1}+M_{2}$ is total mass of the two-stars system;

For the two stars faraway in the Milky Way:

1 year is equivalent of 365 days, so period in years:

$P=\frac{594}{365}$

P = 1.63 years

Calculating total mass:

$a^{3}=(M_{total})P^{2}$

$M_{total}=\frac{a^{3}}{P^{2}}$

$M_{total}=\frac{1.7^{3}}{1.63^{2}}$

$M_{total}=$ 1.85

<u>The total mass of the two-object system is 1.85 mass units.</u>

3 0

3 years ago

how do humans judge temperature without the use of instruments such as thermometers? choose the most common process.

Schach [20]

Some humans judge temperature without the use of instruments include:

touching the object
feeling the radiant energy

<h3>What is temperature?</h3>

Temperature is the measure of the degree of hotness or coldness of a substance.

Temperature of substances are usually measured using thermometers.

The choice of thermometer depends on the temperature range to be measured.

However, some crude ways of measuring temperature include:

touching the object
feeling the radiant energy

In conclusion, temperature measures the hotness or coldness of objects.

Lear more about temperature at: brainly.com/question/25677592

#SPJ1

5 0

2 years ago

Tarzan swings on a 36.0 m long vine initially inclined at an angle of 31.0◦ with the vertical. The acceleration of gravity if 9.

aleksandrvk [35]

Answer:

v = 10 m/s

Explanation:

Given,

Length of the vine, l = 36 m

Angle of inclination = 31.0◦ with the vertical

acceleration due to gravity = 9.81 m/s²

Using Conservation of energy

KE = PE

$\dfrac{1}{2} mv^2 = m g h$

$v = \sqrt{2gh}$

$v = \sqrt{2 g l(1-\cos \theta)$

$v = \sqrt{2\times 9.81\times 36 \times (1-\cos 31^0)$

v = 10 m/s

Hence, the speed of the swing is equal to 10 m/s

7 0

3 years ago

A force of 400-N pushes on a 25-kg box horizontally. The box accelerates at 9 m/s? Find the coefficient of kinetic friction betw

umka2103 [35]

Answer:

Explanation:

Using the Newtons law of motion;

$\sum Fx = ma_x\\Fm - Ff = ma_x$

Fm is the moving force = 400N

Ff is the frictional force = μR

μ is the coefficient of kinetic friction

R is the reaction = mg

m is the mass

a is the acceleration

The equation becomes;

$Fm - \mu R = ma_x\\Fm - \mu mg = ma_x\\400- \mu (25)(9.8) = 25(9)\\400 - 254.8 \mu = 225\\- 254.8 \mu = 225 - 400\\- 254.8 \mu = -175\\ \mu = \frac{-175}{- 254.8} \\\mu = 0.69$

Hence the coefficient of kinetic friction between the box and floor is 0.69

7 0

3 years ago