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3 years ago

What forces hold the planets and the moon together?

Physics

2 answers:

alexgriva [62]3 years ago

6 0

Answer:

Gravity

Explanation:

Because there this is lot of mass there is a force pulling mass to it, that is gravity.

larisa86 [58]3 years ago

4 0

Gravity!

The Sun's gravity pulls the planets in orbit around it, and some planets pull moons in orbit around them. Even spacecraft are in motion through the solar system, either in orbit around the Earth or Moon, or traveling to further worlds, because of gravitational forces.

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The height of a typical playground slide is about 1.8 m and it rises at an angle of 30 ∘ above the horizontal.

Salsk061 [2.6K]

Answer:

$5.94\ \text{m/s}$

$1.7$

$0.577$

Explanation:

g = Acceleration due to gravity = $9.81\ \text{m/s}^2$

$\theta$ = Angle of slope = $30^{\circ}$

v = Velocity of child at the bottom of the slide

$\mu_k$ = Coefficient of kinetic friction

$\mu_s$ = Coefficient of static friction

h = Height of slope = 1.8 m

The energy balance of the system is given by

$mgh=\dfrac{1}{2}mv^2\\\Rightarrow v=\sqrt{2gh}\\\Rightarrow v=\sqrt{2\times 9.81\times 1.8}\\\Rightarrow v=5.94\ \text{m/s}$

The speed of the child at the bottom of the slide is $5.94\ \text{m/s}$

Length of the slide is given by

$l=h\sin\theta\\\Rightarrow l=1.8\sin30^{\circ}\\\Rightarrow l=0.9\ \text{m}$

$v=\dfrac{1}{2}\times5.94\\\Rightarrow v=2.97\ \text{m/s}$

The force energy balance of the system is given by

$mgh=\dfrac{1}{2}mv^2+\mu_kmg\cos\theta l\\\Rightarrow \mu_k=\dfrac{gh-\dfrac{1}{2}v^2}{gl\cos\theta}\\\Rightarrow \mu_k=\dfrac{9.81\times 1.8-\dfrac{1}{2}\times 2.97^2}{9.81\times 0.9\cos30^{\circ}}\\\Rightarrow \mu_k=1.73$

The coefficient of kinetic friction is $1.7$ .

For static friction

$\mu_s\geq\tan30^{\circ}\\\Rightarrow \mu_s\geq0.577$

So, the minimum possible value for the coefficient of static friction is $0.577$ .

8 0

3 years ago

How far from the lens will the image of Jamie's face form?

vladimir1956 [14]

Approx. 983274984065823796374 meters away

6 0

4 years ago

One way in which elements differ from each other is the structure of the electron cloud in each element’s atoms. In an electron

Brums [2.3K]

The electron cloud is split up in 3 areas.

1) Inner Electron Cloud
2) Outer Electron Cloud
3) Valence Electrons

Your inner cloud is the electrons CLOSEST to the nucleus.
Your outer cloud is the electrons in the MIDDLE of the Inner and Valence.
Your valence electrons are the OUTER LAYER of electrons. These electrons are important to bonding, and also are what decide where on the periodic table of elements. For example:

197
Au
79

This element is GOLD. It has 1 valence, therefor it is where it is in the period. Ionization could change this number however.

5 0

4 years ago

Read 2 more answers

What is the difference between a hurricane watch and a hurricane warning

madreJ [45]

Answer:

Hurricane watch means hurricane conditions are expected in a specified area. As defined by National Oceanic and Atmospheric Administration (NOAA), it means that hurricane conditions (sustained winds of 74 mph or greater) are possible within your area. WHILE,

Hurricane warnings means hurricane conditions are expected in an area.

So while hurricane watch may not occur, hurricane warnings will most likely occur. Watch is usually issued hours before the warning is.

5 0

4 years ago

Read 2 more answers

The pulley has an efficiency of 78%. How much useful work does the pulley do if you perform 775 J of work on the pulley

LekaFEV [45]

Answer:

605 J

Explanation:

Efficiency = work out / work in

0.78 = W / 775 J

W = 605 J

4 0

4 years ago