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3 years ago

Describe how elements are formed in stars.

Physics

1 answer:

elena-14-01-66 [18.8K]3 years ago

6 0

Answer:

Stars create new elements in their cores by squeezing elements together in a process called nuclear fusion.

Explanation:

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Why does a change in the food web affect the balance of an ecosystem?

Deffense [45]

Answer: C) In an ecosystem, prey and predator populations affect each other.

Think of cause and effect: The wolves keep the deer population in check because they hunt them. If the wolf population increases, the deer population goes down. If you reduce the number of wolves than the deer population goes up.

Hope this helps :)

7 0

3 years ago

Given that a pipe having a diameter of 1.5 feet and a height of 10 feet, what is the psi at 5 feet ?

grin007 [14]

Answer:

The pressure is 2.167 psi.

Explanation:

Given that,

Diameter = 1.5 feet

Height = 10 feet

We need to calculate the psi at 5 feet

Using formula of pressure at a depth in a fluid

Suppose the fluid is water.

Then, the pressure is

$P=\rho g h$

Where, P = pressure

$\rho$ = density

h = height

Put the value into the formula

$P=1000\times9.8\times1.524$

$P=14935.2\ N/m^2$

Pressure in psi is

$P=2.166167621\ psi$

$P=2.167\ psi$

Hence, The pressure is 2.167 psi.

4 0

3 years ago

Two projectile launchers are beside one another on level ground. Both launchers are directed at the same angle with respect to g

kakasveta [241]

Answer:

(a) Projectile B will travel 4 times as far as projectile A prior to landing

Explanation:

Initial velocity = v

Angle at which the projectile is shot at = θ

g = Acceleration due to gravity

Range of a projectile is given by

$R=\frac {v^{2}\sin 2\theta}{g}$

When Initial velocity = v

$R_A=\frac{v^{2}\sin 2\theta}{g}$

When Initial velocity = 2v

$R_B=\frac{(2v)^{2}\sin 2\theta}{g}\\\Rightarrow R_B=\frac{4v^2\sin 2\theta}{g}$

Dividing the equtions, we get

$\frac{R_A}{R_B}=\frac{\frac{v^{2}\sin 2\theta}{g}}{\frac{4v^2\sin 2\theta}{g}}$

Here, the angle at which the projectiles are fired at are equal.

$\frac{R_A}{R_B}=\frac{1}{4}\\\Rightarrow R_B=4R_A$

Hence, projectile B will travel 4 times as far as projectile A prior to landing

7 0

3 years ago

an athlete runs 5.4 laps around a circular track that is 400.0 m long. If this takes 540 s, what is the average velocity of the

Slav-nsk [51]

Answer:

Average velocity is 0.296 m/s.

Average speed is 4.0 m/s.

Explanation:

Given:

Distance of the circular track is, $D=400.0\ m$

Number of laps ran is, $n=5.4$

Time taken for the run is, $t=540\ s$

Now, total distance covered in 5.4 laps = $D_T=D\times n=400\times 5.4=2160\ m$

Also, since the path is a circle, the final position of the athlete after 5.4 laps will be 0.4 of 400 m ahead of the starting point.

Distance covered in 0.4 laps is, $\textrm{Displacemet}=0.4\times 400=160\ m$

Therefore, the displacement of the athlete will be 160 m as the athlete is 160 m ahead of the starting point and displacement depends on the initial and final points only.

Now, average velocity is given as:

$v_{avg}=\frac{\textrm{Displacemet}}{t}=\frac{160}{540}=0.296\ m/s$

Average speed is the ratio of total distance covered to total time taken.

So, average speed = $\frac{D_T}{t}=\frac{2160}{540}=4\ m/s$

6 0

4 years ago

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goblinko [34]

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5 0

3 years ago