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4 years ago

PLLLLLLEEEEESSEEEEE HELP!!!!!!!

Physics

2 answers:

Igoryamba4 years ago

6 0

It is C for the question..

Vesna [10]4 years ago

3 0

It is c I took the test

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As a clump of interstellar gas contracts to become a main-sequence star, its changing position on the H-R diagram tells us _____

Stels [109]

Answer:

how its outward appearance is changing

Explanation:

H-R diagram is a fundamental tool used to classify stars. The position of stars on the H-R diagram is dependent on its luminosity and temperature.

The position of the star is represented by its outward appearance specially the color. The hottest and brightest the star, the more it lies between the red and blue color range.

The cooler stars lie on the right side of the H-R diagram while the hot stars lie on the left side of the H-R diagram.

6 0

3 years ago

Argon in the amount of 1.5 kg fills a 0.04-m3 piston cylinder device at 550 kPa. The piston is now moved by changing the weights

Arlecino [84]

Answer:

275 kPa

Explanation:

mass of the gas=m=1.5 kg

initial volume if the gas=V₁=0.04 m³

initial pressure of the gas= P₁=550 kPa

as the condition is given final volume is double the initial volume

V₂=final volume

V₂=2 V₁

As the temperature is constant

T₁=T₂=T

$\frac{P1V1}{T1}$ = $\frac{P2 V2}{T2}$

putting the values in the equation.

$\frac{P1V1}{T1}$ = $\frac{P2 *2V1}{T2}$

P₂= $\frac{P1}{2}$

P₂= $\frac{550}{2}$

P₂=275 kPa

So the final pressure of the gas is 275 kPa.

3 0

4 years ago

The temperature of a heat engine is 500 K. Some of the heat generated by the engine flows to the surroundings, which are

Naddik [55]

Answer:

The efficiency of the engine is 75% under given conditions.

<u>Explanation: </u>

<em>Efficiency is defined as the ratio of work done by the engine to the total heat supplied to a heat engine</em>. We know work done by the heat engine be difference between total heat supplied $\left(Q_{h}\right)$ by total heat utilized $\left(Q_{c}\right)$ . We can derive formula for efficiency by considering the above factors, $\text { efficiency }=\frac{\text { work done }}{\text { heat suplied }}=\frac{Q_{h}-Q_{c}}{Q_{h}}=1-\frac{Q_{c}}{Q_{h}}=1-\frac{T_{1}}{T_{2}} \therefore \text { efficiency }=1-\frac{T_{1}}{T_{2}}$

Now consider a heat engine is at a temperature of 500K and the heat produced by the engine released to the surroundings at a temperature of 125K. The efficiency is calculated by using the above formula, $\text { efficiency }=1-\frac{T_{1}}{T_{2}}=1-\frac{125}{500}=1-0.25=0.75$

∴ Efficiency of the engine is 75%

8 0

3 years ago

Which properties do all metals on the periodic table share?

koban [17]

Answer: D. They conduct thermal and electrical energy.

Explanation:

4 0

3 years ago

A shotputter throws the shot with an initial speed of 15.6 m/s at a 30.0 degree angle to the horizontal. Calculate the horizonta

vfiekz [6]

To calculate the horizontal distance traveled by the shot if it leaves the athlete's hand at a height of 2.20 above the ground we can get the root of the quad equation for time are t=-0.24 or t =1.84 taking the t = 1.84, so the equation will be:
x = 15.6cos(30) * 1.86, x = 24.79m

8 0

3 years ago