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2 years ago

Which statements describe properties of stars? Check all that apply.

2 answers:

7 0

One, three and five are correct.

Although if the second statement is saying that stars use gravitational force to support nuclear fusion which in turn produces energy then that would be correct, but I don’t think so :)

swat322 years ago

4 0

Answer:

Stars produce energy through nuclear fusion.
Stars are massive objects composed of gas.
Stars are composed primarily of hydrogen and helium.

Explanation:

Stars are massive objects that have a large gravitational field, which drives the star to contract on itself, which is why fusion occurs: in the center of the star the nuclei of atoms are already so close due to gravity and high temperatures that bind. This is what is called nuclear fusion and is the energy source of a star.

On the other hand yes, the main elements of a star are hydrogen and helium (two hydrogen nuclei fuse to make helium), this makes the star mainly a huge ball of gas so there is no solid surface where you can stand on.

And about water on a star, that is not possible. Temperatures on stars are very vey high that watter could not exist in a liquid form on them.

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A 50-cm-long spring is suspended from the ceiling. A 290 g mass is connected to the end and held at rest with the spring unstret

nasty-shy [4]

Answer:

a) Spring Constant $K=18.946\ \rm N/m$

b) Amplitude of the oscillation $A=0.3\ \rm m$

c)Frequency o the oscillation $\nu =1.287\ \rm rev/s$

Explanation:

Given:

Magnitude of the mass, m=0.29 kg

Spring is stretched by x=30 cm

When Finally the mass comes to rest after 30 cm of stretching in spring then work done by all the forces is equal to the change in kinetic Energy of the of the mass

$\dfrac{Kx^2}{2}=mgh\\\dfrac{K\times0.3^2}{2}=0.29\times 9.8\times0.30\\K=18.946\ \rm N/m$

b) The Amplitude of the oscillation is 0.3 m

c) Let Frequency of the oscillation of the mass be $\nu$ which is given by

$\nu=\sqrt{\dfrac{K}{m}}\\\nu=\dfrac{1}{2\pi}\sqrt{\dfrac{18.946}{0.29}}\\\nu=1.287\ \rm rev/s$

8 0

2 years ago

The logarithm of x, written log(x), tells you the power to which you would raise 10 to get x. So, if y=log(x), then x=10^y. It i

Lelechka [254]

Answer:

Explanation:

The function which is inverse to exponentiation is called logarithm.

It is of the form

$log\ x=y\\\Rightarrow log_{10}\ x=y\\\Rightarrow 10^y=x$

The 10 here is the base of the logarithm. The logarithm with base 10 is called common logarithm

$log_{10}1000000=y\\\Rightarrow 10^y=1000000\\\Rightarrow 10^6=1000000\\\Rightarrow y=6$

So, log(1,000,000) = 6

8 0

3 years ago

A remote-controlled car runs on a 9V battery. If a 1.5A current is running through the circuit, what resistance is the car prov

Aleonysh [2.5K]

Ohm's law:

V = I * R, so R = V/I = 9/1.5 = 6 Ohm

4 0

3 years ago

Equation for fluid density

MrMuchimi

<span> (ρ = m / V) hope this helps...:)</span>

7 0

3 years ago

The light reactions could be viewed as analogous to a hydro-electric dam. In that case, the wall of the dam that holds back the

Viktor [21]

The light reactions could be viewed as analogous to a hydroelectric dam. In that case, the wall of the dam that holds back the water would be analogous to the thylakoid membrane.

Thylakoid membrane is present in cyanobacteria and chloroplasts of plants. It plays a crucial role in photosynthesis and photosystem II reactions.

In general, these are the regions where light-dependent reactions take place. The thylakoid membrane is a lipid-bound membrane that maintains potential difference and also controls the flow of liquids across the membrane during light reactions.

In the provided case, we can see that the wall of the dam holds back the water, similarly, in light-dependent reactions, thylakoid membranes control the liquid flow and also regulate the potential gradient across the membrane and also allow the selective proteins to pass through.

If you need to learn more about light reactions click here:

brainly.com/question/26623807

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3 0

1 year ago