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3 years ago

Which characteristics can be used to differentiate star systems? Select three options

Physics

2 answers:

Veseljchak [2.6K]3 years ago

7 0

Answer: 1,3, and 4 on EDGE science just did the assignment

Explanation:

Lady bird [3.3K]3 years ago

5 0

Answer:

Explanation:

the answer is a,c,d because the stars are characterized by the color temperature, size, composition, and brightness

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Suppose you walk 18.0 m straight west and then 25.0 m straight north, how far are you from your starting point? answer

KatRina [158]

Solution:

Since the directions are perpendicular,

So we must use Pythagoras theorem:

d = √(18.0² + 25.0²) m = 30.8 m

Thus,

This the required distance from the starting point.

4 0

4 years ago

How many muscles do we have?

Umnica [9.8K]

Answer:

more than 600 muscles

Explanation:

there are more than 600 muscles in a human body

8 0

3 years ago

When you drop a ball it accelerates downward at a rate of g. If you instead throw it downward, then its acceleration immediately

Sauron [17]

The acceleration of the ball is always g

Explanation:

An object is said to be in free fall if there is only the force of gravity acting on it. In such situation, therefore, the net force on the ball is

$F=mg$ (1)

where

m is the mass of the ball

$g=9.8 m/s^2$ is the acceleration of gravity, pointing downward

Applying Newton's second law,

$F=ma$ (2)

where a is the acceleration, and equating (1) and (2), we find the acceleration of an object in free fall:

$mg=ma\\a=g$

So, any object in free fall has always an acceleration of $g$ (downward), regardless of its initial velocity.

Therefore, in this problem, it doesn't matter what is the direction of the initial velocity of the ball: its acceleration, in fact, will be always equal to g.

Learn more about free fall:

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#LearnwithBrainly

4 0

4 years ago

The human eye is most sensitive to green light of wavelength 505 nm . Experiments have found that when people are kept in a dark

liq [111]

1. $5.94\cdot 10^{14} Hz$

The frequency of a photon is given by:

$f=\frac{c}{\lambda}$

where

c is the speed of light

$\lambda$ is the wavelength

The wavelength of the photon in this problem is

$\lambda=505 nm=5.05\cdot 10^{-7}m$

So, the frequency of the photon is

$f=\frac{3\cdot 10^8 m/s}{5.05\cdot 10^{-7} m}=5.94\cdot 10^{14} Hz$

2. $3.94\cdot 10^{-19}J, 2.46 eV$

The energy of a photon is given by

$E=hf$

where

h is the Planck constant

f is the frequency of the photon

The frequency of the photon in this problem is

$f=5.94\cdot 10^{14} Hz$

so its energy in Joules is

$E=(6.63\cdot 10^{-34}Js)(5.94\cdot 10^{14}Hz)=3.94\cdot 10^{-19}J$

And since

$1 eV = 1.6\cdot 10^{-19}J$

The energy in eV is

$E=\frac{3.94\cdot 10^{-19} J}{1.6\cdot 10^{-19}J/eV}=2.46 eV$

7 0

3 years ago

A hiker, caught in a rainstorm might absorb 1 liter of water in her clothing. if it is windy so that this amount of water is eva

NeTakaya

Water evaporates at 100⁰C

So change in temperature = 100-20 = 80⁰C

Amount of water to be evaporated = 1 liter = 1L*1kg/liter = 1 kg

Specific heat of water is 1 calorie/gram ⁰C = 4.186 joule/gram =4186 J/kg

So heat required E = mcΔT = 1 * 4186 *80= 334880 J =334.88 kJ

So amount of heat require to evaporate water = 334.88 kJ

4 0

3 years ago