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3 years ago

The first model of an atom was a simple, neutral sphere.

2 answers:

7 0

<span>Thomson proposed in 1898 a new model, according to which the atom would be a massive sphere whose mass corresponded almost to the total mass of the atom itself. In this sphere would be the negatively charged electrons. As the atom was electrically neutral, Thomson stated that the matter constituting the sphere was positively charged.</span>

andre [41]3 years ago

3 0

Because he found that electrons are negatively charged particles, seperate from the positively charged nucleus, although his model was still incorrect

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A satellite is in a circular Earth orbit of radius r. The area A enclosed by the orbit depends on r2 because A = πr2. Determine

Salsk061 [2.6K]

Answer:

a. $T=r^{3/2}$

b. $K=\frac{1}{r}$

c. $v=\frac{1}{\sqrt{r}}$

d. $v=\sqrt{r}$

Explanation:

To make analysis about the satellite circular earth the depends or r and A

$T^2=\frac{4\pi}{GM}*r^3$

$K=\frac{GM*m}{2*r}$

$T^2=r^3$

$T=r^{3/2}$

$K=\frac{GM*m}{2}*\frac{1}{r}$

$K=\frac{1}{r}$

$K=\frac{1}{2}*m*v^2$

$v^2=\frac{2*K}{m}=\frac{2*Gm*m}{2*m*r}$

$v=\frac{1}{\sqrt{r}}$

$v=\sqrt{2*GMr}$

$v=\sqrt{r}$

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3 years ago

A 100 kg roller coaster car is located at the top of a hill where the height is 20 m. What is the velocity when it reaches the b

galina1969 [7]

The velocity of the car at the bottom of the hill=19.8 m/s

mass= 100 kg

height= h=20 m

Velocity at the bottom=V

Using the law of conservation of energy

potential energy at top = kinetic energy at the bottom

m g h= 1/2 m v²

g h= 1/2 v²