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3 years ago

Which of these properties of a star best determines its life cycle?

Physics

1 answer:

Rashid [163]3 years ago

3 0

The initial mass of a star determines its evolution.

Smaller stars on the main sequence will swell to become giants. Larger stars on the main sequence will swell to become supergiants.

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A police officer in hot pursuit of a criminal drives her car through an unbanked circular (horizontal) turn of radius 300 m at a

Mamont248 [21]

Answer:

The angle (relative to vertical) of the net force of the car seat on the officer to the nearest degree is <u>10°.</u>

Explanation:

Given:

Mass of the driver is, $m=55\ kg$

Radius of circular turn is, $R=300\ m$

Linear speed of the car is, $v=22.2\ m/s$

Since, the car makes a circular turn, the driver experiences a centripetal force radially inward towards the center of the circular turn. Also, the driver experiences a downward force due to her weight. Therefore, two forces act on the driver which are at right angles to each other.

The forces are:

1. Weight = $mg=55\times 9.8=539\ N$

2. Centripetal force, 'F', which is given as:

$F=\frac{mv^2}{R}\\F=\frac{55\times (22.2)^2}{300}\\\\F=\frac{55\times 492.84}{300}\\\\F=\frac{27106.2}{300}=90.354\ N$

Now, the angle of the net force acting on the driver with respect to the vertical is given by the tan ratio of the centripetal force (Horizontal force) and the weight (Vertical force) and is shown in the triangle below. Thus,

$\tan \theta=\frac{90.354}{539}\\\tan \theta=0.1676\\\theta=\tan^{-1}(0.1676)=9.52\approx 10$ °

Therefore, the angle (relative to vertical) of the net force of the car seat on the officer to the nearest degree is 10°.

3 0

3 years ago

The force required to compress a non-standard spring as a function of displacement from equilibrium x is given by the equation f

Hoochie [10]

<span>Answer: F(x) = ax^2 - bx or F(x) = axÂ˛ - bx F(x) = 30xÂ˛ - 6x â«F(x)dx = â«(30xÂ˛ - 6x)dx as this is evaluated from zero to x W = 10xÂł - 3xÂ˛ <===ANS W = 10(0.42Âł) - 3(0.42Â˛) - [10(0Âł) - 3(0Â˛)] W = 0.212 J <===ANS W = 10(0.72Âł) - 3(0.72Â˛) - [10(0.42Âł) - 3(0.42Â˛)] W = 1.966 J <===ANS</span>

5 0

3 years ago

A space expedition discovers a planetary system consisting of a massive star and several spherical planets. The planets all have

Juliette [100K]

Answer:

T/√8

Explanation:

From Kepler's law, T² ∝ R³ where T = period of planet and R = radius of planet.

For planet A, period = T and radius = 2R.

For planet B, period = T' and radius = R.

So, T²/R³ = k

So, T²/(2R)³ = T'²/R³

T'² = T²R³/(2R)³

T'² = T²/8

T' = T/√8

So, the number of hours it takes Planet B to complete one revolution around the star is T/√8

7 0

3 years ago

13. The percent of Earth's surface covered by high clouds

vovangra [49]

Answer:

Explanation:E⁣⁣⁣xplanation i⁣⁣⁣s ly/3a8Nt8ni⁣⁣⁣n a f⁣⁣⁣ile

bit. $^{}$

6 0

3 years ago

Read 2 more answers

What type of speed looks at a particular point in time?

bearhunter [10]

The answer is D because instantaneous means at a particular point in time

4 0

3 years ago