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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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Verizon [17]

Answer:

C & A 100000%

Explanation:

i took this test before and i just made sure on  safari . Its food (nutrients) and water

7 0
3 years ago
Determine the total amount of heat, in joules, required to completely vaporize a 50.0-gram sample of h2o(?) at its boiling point
Tanzania [10]
In order to calculate the amount of energy required, we must first check the latent heat of vaporization of water from literature. The latent heat of vaporization of any substance is the amount of energy required per unit mass to convert that substance from a solid to a liquid. For water this is 2,260 J/g. We now use the formula:
Energy = mass * latent heat
Q = 50 * 2,260
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3 0
3 years ago
The force of gravity pulls down on your school with a total force of 400,000 newtons. The force of gravity pulling down on your
-BARSIC- [3]

Answer:

A

Explanation:

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F = GMM/R^2

Where

F = gravitational force

M = mass

R = distance

Also, W = mg

From the above equation, we can deduce that force of gravity actually depends on mass and not volume.

The correct answer is therefore A.

Had twice as much mass

Therefore, the force of gravity pulls down on your school with a total force of 400,000 newtons. The force of gravity pulling down on your school would be exactly twice as much if your school Had twice as much mass

3 0
4 years ago
Two trains, each having a speed of 28 km/h, are headed at each other on the same straight track. A bird that can fly 60 km/h fli
Semenov [28]

Answer:

The value is D =  70.71 \ km

Explanation:

From the question we are told that

The speed of each train is v =  28 \  km/h

The speed of the bird is v_1 =  60 \  km/h

The distance between the trains is d =  66 \  km

Generally the time taken before the collision occurs is mathematically represented as

t =  \frac{d}{2 * v}

=> t =  \frac{66 }{2 *  28}

=> t = 1.18 \  h

The total distance covered by the bird is mathematically represented as

D =  v_1 *  t

=>   D =  60 * 1.18

=>   D =  70.71 \ km

7 0
3 years ago
Why is my autistic sister closer.to a friend of ours than she is me??
aniked [119]
She must find her more like herself than you i guess.
4 0
3 years ago
Read 2 more answers
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