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3 years ago

Select the choice that best completes the following sentence: A _ is made up of one or more _.

Physics

1 answer:

Karolina [17]3 years ago

7 0

A Rock is made up of one or more minerals

Explanation:

Rocks are natural substances often made up of one or combination of various other minerals held together in a closed crystalline matrix. These minerals provide the rock with its characteristic feature.

E.g.- Earth is also made up of several types of rocks such as Granite, Gabbro, etc. Basalt is another commonly found rock in the Earth’s oceanic crust. It is formed due to the solidification of the molten magma coming from the partially molten Aesthenosphere. It is formed mainly of two other minerals viz. Plagioclase and Pyroxene

Thus, Basalt- Plagioclase + Pyroxene

(rock type)- (mineral) + (mineral)

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A girl moves quickly to the center of a spinning merry-go-round, traveling along the radius of the merry-go-round. Which of the

DochEvi [55]

Answer:

The angular speed of the system increases.

The moment of inertia of the system decreases.

Explanation:

As we know that the girl is going towards the center of the circle so here the moment of inertia of the girl is given as

$I = mr^2$

here we know that

r = position of the girl from the center of the disc

now we know that the girl is moving towards the center so its distance will continuously decreasing

So the moment of inertia of the girl will decrease

Now we know that that with respect to the center of the disc there is no torque on the disc + girl system

So here we can use angular momentum conservation

So we have

$I\omega = constant$

since moment of inertia is decreasing for the system

so angular speed will increase

3 0

4 years ago

Explain what exponential growth is?

Orlov [11]

Exponential growth is a pattern of data that shows greater increases with passing time, creating the curve of an exponential function.

6 0

3 years ago

NASA launches a satellite into orbit at a height above the surface of the Earth equal to the Earth's mean radius. The mass of th

Rzqust [24]

Answer:

a) 3h 59’ b) 5,590 m/s c) 1,910 N

Explanation:

The only force acting on the satellite (neglecting the influence of any other body) is just the attractive force from Earth, which is given by the Universal Law of Gravitation:

Fg = G* ms*me / (res² (1)

where: G = 6.67* 10⁻¹¹ N.m² / kg² ms = 780 kg, me= 5.97* 10²⁴ kg, and

res = 2* 6.38* 10⁶ m (distance between the center of the Earth and the satellite).

Fg = 1,910 N (answer c)

At the same time, this force, is the centripetal force that keeps the satellite in orbit, and that can be written as follows:

Fg = ms * v² / res (2)

By definition of velocity, we can say that the constant speed at which the satellite orbits, can be expressed as the quotient between the distance travelled around the Earth once, and the time needed to do that, which is called the period of the orbit:

v = 2*π*res / T (3)

We can solve for v first, taking the right sides of (1) and (2), as follows:

G* ms*me / (res)²= ms * v² / res

v = √(G*me/r) = 5,590 m/s (answer b)

Once obtained the value of v, we can replace in (3), and solve for T:

T = 2* π*res / v = 3 h 59 min (answer a)

7 0

3 years ago

A solid sphere with mass, M, and radius, R, rolls along a level surface without slipping with a linear speed, v. What is the rat

Marizza181 [45]

Answer:

$\dfrac{KE_R}{KE_L}=\dfrac{2}{5}$