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Agata [3.3K]
3 years ago
11

Which of the following is the best thermal insulator?

Physics
1 answer:
Vera_Pavlovna [14]3 years ago
4 0

B. Aluminum is possibly correct

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18. Two spaceships are traveling in the same direction. With respect to an inertial frame of reference, spaceship A has a speed
quester [9]

Answer:

v_{A} -v_{B}=v_{AB}\\v_{AB} =0.9c-0.5c\\v_{AB}=0.4c

Explanation:

Because the spaceships are traveling in the same direction, you should subtract the speed of spaceship A from the speed of spaceship B in order to calculate v_{AB}.

6 0
4 years ago
What is the magnitude of the gravitational force acting on the sun due to the earth?The earth does not exert any gravitational f
Sholpan [36]

I haven't worked on Part-A, and I don't happen to know the magnitude of the gravitational force that the Sun exerts on the Earth.  

But whatever it is, it's exactly, precisely, identical, the same, and equal to the magnitude of the gravitational force that the Earth exerts on the Sun.

I think that's the THIRD choice here, but I'm not sure of that either.

4 0
3 years ago
The average distance of the planet mercury from the sun is 0.39 times the average distance of the earth from the sun. How long i
Stels [109]

Answer:

T_1=0.24y

Explanation:

Using Kepler's third law, we can relate the orbital periods of the planets and their average distances from the Sun, as follows:

(\frac{T_1}{T_2})^2=(\frac{D_1}{D_2})^3

Where T_1 and T_2 are the orbital periods of Mercury and Earth respectively. We have D_1=0.39D_2 and T_2=1y. Replacing this and solving for

T_1^2=T_2^2(\frac{D_1}{D_2})^3\\T_1^2=(1y)^2(\frac{0.39D_2}{D_2})^3\\T_1^2=1y^2(0.39)^3\\T_1^2=0.059319y^2\\T_1=0.24y

5 0
3 years ago
HELP!!!! 20 pointsss
PSYCHO15rus [73]

Answer:

The answer will be the first one.

Explanation:

Divide

7 0
3 years ago
Read 2 more answers
Will give 45 points to who ever solves this
Lubov Fominskaja [6]

Answer:

1.  230 kg...

W = m * g

W= 230 kg  * 9.81 m/s^2

<u>W=  2256,3 N</u>

     m= 230kg ,   W = 2256,3 N , g= 9.81 m/s^2

2.  887 N

W= m * g

887 N = m * 9.81 m/s^2

<u>m= 90,42 kg</u>

     m= 90,42 kg,  W = 887 N ,  g= 9.81 m/s^2

3.  420 kg

W= m * a

w= 420 kg *  9.81 m/s^2

<u>w=</u><u>  </u><u>4120,2 N</u>

     m=  420 kg , W = 4120,2 N , g= 9.81 m/s^2

4. Determine the gravity on Pluto where a 15 kg object weighs 55.5N.

w = m * g

55.5 N = 15 kg * g

<u>a=  3,7 m/s^2</u>

     m = 15 kg , W= 55.5 N , g=  3,7 m/s^2

7 0
2 years ago
Read 2 more answers
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