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2 years ago

Which sphere has the longest gravitational potential energy?

Physics

1 answer:

sveticcg [70]2 years ago

5 0

Gravitational potential energy is the higher it us above the ground the more gravitational potential energy it holds.Sphere 2 says it has three times the mass of sphere 1. Therefore the answer is Sphere 2 since it was raised three time the mass of sphere 1. and the rest of the answer choices dont make sense.

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A spool of thin wire (with inner radius r = 0.45 m, outer radius R = 0.60 m, and moment of inertia Icm = 0.8208 kg·m2) pivots on

makkiz [27]

Answer:

$E_L=4.667J$

Explanation:

The energy lost can be model by the energy equation in potential and kinetic energy in each step of the motion

Given: $r=0.45m$ , $R=0.60m$ , $I_m=0.8208 kg*m^2$ , $v=63.1cm/s$ , $m=1.3kg$

$E_p=m*g*r$

$E_p=1.3kg*9.8m/s^2*0.45m$

$E_p=5.733 J$

Kinetic energy:

$K_{Es}=\frac{1}{2}*I*w^2$ , $K_{Ep}=\frac{1}{2}*m*v^2$

$w=v^2/r$

Energy lost :

$E_p-K_{Es}-K_{Ep}=0$

$5.733J-\frac{1}{2}*0.8208kg*(\frac{(0.631m/s)^2}{0.45m})^2-\frac{1}{2}*1.3kg*(0.631m/s)^2=0$

$E_L=4.667J$

3 0

4 years ago

What is the gravitational force between two masses of 15kg each, when their centers are 0.25m? Could you detect this force with

Lunna [17]

Well I don't know !
Let's work it out.

The gravitational force between two objects is

   F = G · M₁·M₂ / R²     .

'G' is the 'universal gravitational constant'. We could look it up.
'M₁' is the mass of one object
'M₂' is the mass of the other object
'R' is the distance between their centers.

It looks complicated, but stay with me. We can do this !
We know all the numbers, so we can calculate the force.

'G' is 6.67 x 10⁻¹¹ newton·meter² / kg² (I looked it up. You're welcome.)
'M₁' is 15 kg
'M₂' is 15 kg
'R' is 0.25 meter.

Now it's time to pluggum in.

   F = G · M₁·M₂ / R²

   = (6.67 x 10⁻¹¹ newton·meter² / kg²) · (15 kg) · (15 kg) / (0.25 m²)

   = (6.67 x 10⁻¹¹ · 15 · 15 / 0.0625) N·m²·kg·kg / kg²·m²

   =    2.4 x 10⁻⁷ Newton .

That a force equivalent to about 0.00000086 of an ounce.
This is the answer to part-a.

Concerning the answer to part-b ...
Personally, I could not detect this force, no matter what kind of equipment
I had. But I am just a poor schlepper engineer, educated in the last Century,
living out my days on Brainly and getting my kicks from YouTube videos.
I am not pushing the box to the envelope, or thinking outside the cutting
edge ... whatever.
I am sure there are people ... I can't name them, because they keep a
low profile, they stay under the radar, they don't attract a lot of media
attention, their work is not as newsworthy as the Kardashians, and plus,
they seldom call me or write to me ... but I know in my bones that there
are people who have measured the speed of light to NINE significant figures,
aimed a spacecraft accurately enough to take close-up pix of Pluto ten years
later, and detected gravity waves from massive blobs that merged 13 billion
years ago, and I tell you that YES ! THESE guys could detect and measure
a force of 0.86 micro-ounce if they felt like it !

4 0

3 years ago

Topics:

spin [16.1K]

I need you to make me an invented poem written please not in image

3 0

2 years ago

Describe how the life cycle of a low-mass star differs from the life cycle of a high-mass star. PLZZZZ ANSWER FAST

Alex Ar [27]

As the core collapses, the outer layers of the star are expelled. A planetary nebula is formed by the outer layers. The core remains as a white dwarf and eventually cools to become a black dwarf. that is what would happen to a star with a low mass like our sun also the life time of a star depends on it's mass. A larger mass star will colapse and turn into a black hole.

8 0

3 years ago

Which illustrates projectile motion?

Step2247 [10]

Answer:

Ans is (B) driving a rock from a building

7 0

3 years ago