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3 years ago

15 POINTS PLEASE HELP

Physics

1 answer:

SVETLANKA909090 [29]3 years ago

7 0

Answer:

Electron

Explanation:

See attached figure (it was missing in the question).

An atom consists of three types of particle:

- Proton: it is positively charged (charge $+e = +1.6\cdot 10^{-19} C$ ) and it is located in the nucleus. Its mass is approximately $1.67\cdot 10^{-27} kg$

- Neutron: it has no electric charge, and it is also located in the nucleus. Its mass is just slighly larger than that of the proton (but it is also approximated to $1.67\cdot 10^{-27} kg$ )

- Electron: it is negatively charged (charge $-e = -1.6\cdot 10^{-19} C$ ) and it orbits around the nucleus. Its mass is much smaller than that of the proton ( $m_e = 9.11 \cdot 10^{-31} kg$ )

From the figure, we see that the only particle orbiting around the nucleus is particle A: therefore, A must be an electron.

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A paintball is shot horizontally in the positive x direction at time t after the ball is shot it is 4 cm to the right and 4 cm b

Artist 52 [7]

<u>Answer:</u>

At time 2t the paint ball is at 8 cm to the right and 16 cm to the bottom

<u>Explanation:</u>

We have equation of motion , $s= ut+\frac{1}{2} at^2$ , s is the displacement, u is the initial velocity, a is the acceleration and t is the time.

Considering the horizontal motion of paint ball

Distance traveled during time t = 4 cm

Initial velocity = u m/s

Acceleration = 0 $m/s^2$

So $4 = u*t+\frac{1}{2} *0*t^2\\ \\ u = \frac{4}{t}$

Now at time 2t,

$S= u*2t+\frac{1}{2} *0*(2t)^2\\ \\=\frac{4}{t} *2t\\ \\ =8cm$

So horizontal distance traveled in time 2t = 8 cm to the right

Now considering the vertical motion of paint ball

Distance traveled during time t = 4 cm

Initial velocity = 0 m/s

Acceleration = -g $m/s^2$

$4=0*t-\frac{1}{2} *g*t^2\\ \\ t^2=\frac{-8}{g}$

At time 2t,

$S=0*2t-\frac{1}{2} *g*(2t)^2\\ \\ =-\frac{1}{2} *g*4*\frac{-8}{g}\\ \\ =16 cm$

So vertical distance traveled in time 2t = 16 cm to the bottom

6 0

3 years ago

In the 1920s what did Edmund hubble notice about the galaxies

zlopas [31]

Hubble noticed that the galaxies were moving away from us, which meant the universe was expanding.

This is why constellations change over time. In some years, the Big Dipper won't actually look like a dipper anymore.

5 0

3 years ago

A vessel is filled with a liquid of density 1900 kg/m3 . There are two holes (one above the other) in the side of the vessel. Li

FromTheMoon [43]

Answer:

110 meters is the distance where they will intersect

Explanation:

given,

liquid density = 1900 kg/m³

distance of upper hole = 19 m

distance of lower hole = 117 m

acceleration due to gravity = 9.8 m/s²