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wolverine [178]
3 years ago
6

1. Astronomical observatories have been available since ancient times, and many cultures set aside special sites for astronomica

l observations. The thing modern observatories have that was missing from these older observatories until about 1610 was: a. a dark site, where lights did not get in the way b. graduate students or other assistants for sharing the astronomer’s work c. a method of keeping good records d. a way of measuring from what general direction in the sky a beam of light was coming e. telescopes
Physics
1 answer:
nydimaria [60]3 years ago
4 0

Answer:

e telescopes

Explanation:

may i be marked brainliest?

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A rocket is fired vertically upward. At the
Galina-37 [17]

Answer:

767.6 m/s

Explanation:

We consider momentum in both x and y components

Since momentum, p=mv where m denote mass while v is velocity then

In the y direction

3m*288=279m+my

y=585 m/s

In the x direction and taking right as positive then

3m*288=367m+mx

x=497 m/s

The resultant gives the velocity of the third fragment

Third=\sqrt{585^{2}+497^{2}}=767.6157893\approx 767.6 m/s

6 0
3 years ago
The weight on the moon is....<br>that of earth.​
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Answer:

16.5% that of on earth

Explanation:

from google:

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6 0
4 years ago
What state of matter has the highest energy? options: <br> A. solid <br> B. gas <br> C. liquid
tensa zangetsu [6.8K]

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gas

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6 0
4 years ago
Read 2 more answers
The Milky Way has a diameter (proper length) of about 1.2×105 light-years. According to an astronaut, how many years would it ta
Dmitriy789 [7]

Answer:

t = 134834.31 years

Explanation:

First we find the speed of the ship:

v = 0.890 c

where,

v = speed of the ship = ?

c = speed of light = 3 x 10⁸ m/s

Therefore, using the values, we get:

v = (0.89)(3 x 10⁸ m/s)

v = 2.67 x 10⁸ m/s

Now, we find the distance in meters:

Distance = s = (1.2 x 10⁵ light years)(9.461 x 10¹⁵/1 light year)

s = 11.35 x 10²⁰ m

Now, for the time we use the following equation:

s = vt

t = s/v

t = (11.35 x 10²⁰ m)/(2.67 x 10⁸ m/s)

t = (4.25 x 10¹² s)(1 h/3600 s)(1 day/24 h)(1 year/365 days)

<u>t = 134834.31 years</u>

6 0
4 years ago
A train travels at 270 km in 3 hours . what is the speed of the train?
Ann [662]

270 \div 3 = 90km / h
3 0
3 years ago
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