1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Pavlova-9 [17]
3 years ago
12

Astronomical observatories have been available since ancient times, and many cultures set aside special sites for astronomical o

bservations. The thing modern observatories have that was missing from these older observatories until about 1610 was __________________. Group of answer choices
Physics
1 answer:
Vlada [557]3 years ago
8 0

Answer:

The answer is "telescopes".

Explanation:

Throughout ancient times, astronomical observatories have indeed been available, and so many historical locations were reserved for astronomical observations. All contemporary astronomers lacked within those older telescopes were lenses until 1610. A telescope is indeed an instrument used to view far-off objects. Telescopes often are being used to look at planets and stars.

You might be interested in
How does your education contribute to comunity development
Angelina_Jolie [31]
Because everybody in community needs to be smart & have some type of knowledge
4 0
3 years ago
The density of the Earth is greater than the density of an equal volume of water by _____.
defon

Answer:

I think the second option is correct

please mark me as brainliest

5 0
3 years ago
Which of these are types of meteorites? Select all that apply.
love history [14]

The types of meteorites are iron, stone and iron-stony meteorites. The stony-iron meteorites account for less than 2% of all known meteorites. They comprised of roughly equal amounts of nickel-iron and stone and are divided into two groups: pallasites and mesosiderites. The answers are only B and C

8 0
3 years ago
I will make u brainliest if ur right.
Sonja [21]

Properties to identify a mineral:

Color

Luster

Streak

Hardness

Cleavage

(There appears to be 8 things you need to fill in but I only know this much)

What will scratch Quartz:

Topaz

Corundum

Diamond

sorry I only knew a few of the answers, hope I still helped

6 0
3 years ago
A block of mass m is at rest at the origin at t=0. It is pushed with constant force F0 from x=0 to x=Lacross a horizontal surfac
Tomtit [17]

Answer:

A) v = √[(F₀/m - μ₀) 2x + x2 / L] , b) v = √[2 (F₀ / m - μ₀) +1] L

Explanation:

For this exercise we will use Newton's second law

X axis

           Fo - fr = ma

Y Axis  

          N - W = 0

          N = mg

The equation for the force of friction is

         fr = μ N

        .fr = μ mg

Let's replace

     Fo - μ mg = m a

     a = Fo / m - μ g

They ask us the speed of the block, so we must use

     a = dv / dt = dv/dx  dx dt = dv/dx   v

     v dv = a dx

We replace

     v dv = (F₀ / m - μ₀ (1- x/L)) dx

We integrate

     ∫v dv = F₀ / m ∫ dx - μ₀ ∫ dx + 1 / L ∫ x dx

    ½ v² = (F₀ / m - μ₀) x + 1 / L x² / 2

We evaluate from the lower limit, for x = 0 the speed is zero v = 0, to the upper limit x, v

     ½ v² = (F₀ / m - μ₀) x + 1 / 2L x²

     v = √[(F₀ / m - μ₀) 2x + x2 / L]

Part B

The velocity for x = L

   v = √(F₀ / m - μ₀) 2L + L2 / L

   v = √[2 (F₀ / m - μ₀) +1] L

8 0
3 years ago
Other questions:
  • How would you show an example for the law of inertia?
    11·1 answer
  • A coffee pot in the form of a circular cylinder of radius 3 in. is being filled with water flowing at a constant rate. if the wa
    11·1 answer
  • What provocative statement is Oscar Wilde making?
    5·1 answer
  • A heat pump is used to maintain a house at 22°C by extracting heat from the outside air on a day when the outside air temperatur
    12·1 answer
  • ¿Con que parte de la mano se debe golpear a la pelota en voley?
    10·1 answer
  • A sheet of mica is inserted between the plates of an isolated charged parallel-plate capaci tor. Mica is a transparent mineral t
    11·1 answer
  • A 2 N and an 8 N force pull on an object to the right and a 4 N force pulls on the same object to the left. If the object has a
    13·1 answer
  • What is a measure of how much matter an object is made of?
    12·1 answer
  • Which is an example of a social network?
    6·2 answers
  • Consider a regular solution, for which energy
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!