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kykrilka [37]
3 years ago
15

Which of the following statements about galaxies is true? A. Galaxies typically contain millions of stars. B. Galaxies actually

contain very few stars. C. Galaxies typically contain thousands of stars. D. Galaxies typically contain billions of stars.
Physics
2 answers:
Sloan [31]3 years ago
6 0

the answer is D i took the quiz so it is definitely D  

const2013 [10]3 years ago
6 0

Answer:

D. Galaxies typically contain billions of stars.

Explanation:

A galacy on average contains from 150-250 billion up to 100 trillion of starts, for example the milky way has aproximately 200 billion stars, there are for example andromeda galaxy has approximately 1 trillion stars but the largest observable and found galaxy in the universe is IC1101 has a mass of 100 trillion stars and this is only what we have been able to observe.

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When electrical energy is being used by an electric light, what really happens to the energy?
vitfil [10]

Energy is not created and not  destroyed it will only change form


So heres your answer ; It is given off as other forms of energy/light and heat !!


=answer 2nd one

7 0
3 years ago
Read 2 more answers
Indiana jones (83.5 kg) is running 3.75 m/s when he jumps in a stationary 312 kg mine cart. what is their joint velocity afterwa
Lubov Fominskaja [6]

Answer:

.7917 m/s

Explanation:

This is a conservation of momentum question. You have an object initially at rest (cart) so that object is initially at 0 momentum. Indiana Jones is 83.5 kg and running 3.75 m/s so he starts with a momentum of 313.125 kg * m/s because momentum is equal to mass * velocity. Once the person jumps in the cart, the cart and the person can be considered one object and by conservation of momentum, the momentum of the Indiana-cart system is equal to 313.125 kg * m/s. By that, we can set that momentum equal to the combined mass * joint velocity. So 313.125 = (83.5kg + 312kg) * joint velocity. Then just solve for the velocity. The answer should be smaller than the intial velocity of the person of 3.75 m/s because the mine cart is HUGE at 312kg.

3 0
3 years ago
100 °C is a greater temperature than which of the following?
ohaa [14]
When somebody hands you a Celsius°, it's easy to find the equivalent Fahrenheit°.

Fahrenheit° = (1.8 · Celsius°) + 32° .

So 100°C works out to 212°F.  

It's also easy to find the equivalent Kelvin.  Just add 273.15 to the Celsius.

So now you can see that  100°C  is equal to  A  and  D,
and it's less than  B .

The only one it's greater than is  C .
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