Answer:
32 meters
Explanation:
Given:
x₀ = 0 m
y₀ = 1 m
y = 1 m
v₀ₓ = 18 cos 52° m/s
v₀ᵧ = 18 sin 52° m/s
aₓ = 0 m/s²
aᵧ = -9.8 m/s²
Find: x
First, find the time it takes for the ball to be caught.
y = y₀ + v₀ᵧ t + ½ aᵧt²
1 = 1 + 18 sin 52° t + ½ (-9.8) t²
0 = 14.2 t − 4.9 t²
0 = t (14.2 − 4.9 t)
t = 0 or 2.89
It takes 2.89 seconds to be caught. The horizontal distance traveled in that time is:
x = x₀ + v₀ₓ t + ½ aₓt²
x = 0 + (18 cos 52°) (2.89) + ½ (0) (2.89)²
x = 32.1
Rounded to two significant figures, the ball travels 32 meters.
Which sentence from paragraph 4 most precisely explain the factors that determine the force of gravity?
- <em>"</em><em> </em><em>In</em><em> </em><em>other</em><em> </em><em>words</em><em>,</em><em> </em><em>these</em><em> </em><em>equations</em><em> </em><em>states</em><em> </em><em>the</em><em> </em><em>gravitational</em><em> </em><em>force</em><em> </em><em>between</em><em> </em><em>two</em><em> </em><em>bodies</em><em> </em><em>is</em><em> </em><em>proportional</em><em> </em><em>to</em><em> </em><em>the</em><em> </em><em>product</em><em> </em><em>of</em><em> </em><em>their</em><em> </em><em>masses</em><em> </em><em>and</em><em> </em><em>inversely</em><em> </em><em>proportional</em><em> </em><em>to</em><em> </em><em>the</em><em> </em><em>square</em><em> </em><em>of</em><em> </em><em>the</em><em> </em><em>distance</em><em> </em><em>between</em><em> </em><em>them</em><em>.</em><em>"</em>
It's formula is g=GM/r²
Answer:
Explanation:
In this case we will use the Bohr Atomic model.
We have that: 
We can calculate the centripetal force using the coulomb formula that states:
Where K=
and r is the distance.
Now we can say:
The mass of the electron is = 
Kg
The charge magnitud of an electron and proton are= 
Substituting what we have:
![[tex]a=\frac{9*10^{9}*(1.6*10^{-19} )*(2(1.6*10^{-19} ))}{9.1*10^{-31}*(2.99*10^{-11})^2 }](https://tex.z-dn.net/?f=%5Btex%5Da%3D%5Cfrac%7B9%2A10%5E%7B9%7D%2A%281.6%2A10%5E%7B-19%7D%20%29%2A%282%281.6%2A10%5E%7B-19%7D%20%29%29%7D%7B9.1%2A10%5E%7B-31%7D%2A%282.99%2A10%5E%7B-11%7D%29%5E2%20%7D)
[/tex]
so:
-- Kinetic energy is the energy of mass in motion. The amount is determined by the mass of whatever is moving, and its speed.
-- Potential energy is the energy that's stored up in some form, not being used yet but ready to be used when you want it.
For example, one form of it is <u><em>chemical</em></u><em> </em>potential energy, like in a battery, or a match. You get the energy out of a battery when you connect it to a motor or a light. You get the energy out of as match when you make the tip hot and it flares up.
This question is asking about <u><em>gravitational</em></u> potential energy. An object has stored energy just by being up high, like a bowling ball on a shelf. You get the energy out of it just by dropping it ... possibly enough to crack the floor !
The amount of this kind of potential energy is determined by the mass of the object, and how high up it is.
-- Getting the answers from other people doesn't help you a bit, until you understand them and can answer the question on your own.
