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3 years ago

13

the rapid movement of gas molecules can be explained because gasses have size particles and exert attraction for other gas parti

cles

1 answer:

serg [7]3 years ago

6 0

The rapid movement of gas molecules can be explained because gasses have small size particles and exert little attraction for other gas particles.

Explanation

The particles present in the gas are loosely packed and can move freely inside when compared to the particles present in both liquid and solid state.

Therefore, gas particles have high inter-molecular space.

Also, as these gas particles are loosely packed, the force of attraction between each molecule is less.

To sum up, the particles present have high inter-molecular space and low inter-molecular force of attraction.

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What does the person in front of the ambulance experience?

kow [346]

A higher frequency. I just got this answer on usa test prep.

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3 years ago

A ball is kicked from the top of a building with a velocity of 50 m/s and lands 165 m away from the base of the buildi

solniwko [45]

Answer:

32.3 m/s

Explanation:

The ball follows a projectile motion, where:

- The horizontal motion is a uniform motion at costant speed

- The vertical motion is a free fall motion (constant acceleration)

We start by analyzing the horizontal motion. The ball travels horizontally at constant speed of

$v_x = 50 m/s$

and it covers a distance of

d = 165 m

So, the total time of flight of the ball is

$t=\frac{d}{v_x}=\frac{165}{50}=3.3 s$

In order to find the vertical velocity of the ball, we have now to analyze its vertical motion.

The vertical motion is a free-fall motion, so the ball is falling at constant acceleration; therefore we can use the following suvat equation:

$v_y = u_y +at$

where

$v_y$ is the vertical velocity at time t

$u_y=0$ is the initial vertical velocity

$a=g=9.8 m/s^2$ is the acceleration of gravity (taking downward as positive direction)

Substituting t = 3.3 s (the time of flight), we find the final vertical velocity of the ball:

$v=0 + (9.8)(3.3)=32.3 m/s$

5 0

3 years ago

g Two radiation modes (one at the center frequency lIo and the other at lIO+?lI) are excited with 1000 photons each. Determine t

Schach [20]

Answer:

a) P=0.25x10^-7

b) R=B*N2*E

c) N=1.33x10^9 photons

Explanation:

a) the spontaneous emission rate is equal to:

1/tsp=1/3 ms

the stimulated emission rate is equal to:

pst=(N*C*o(v))/V

where

o(v)=((λ^2*A)/(8*π*u^2))g(v)

g(v)=2/(π*deltav)

o(v)=(λ^2)/(4*π*tp*deltav)

Replacing values:

o(v)=0.7^2/(4*π*3*50)=8.3x10^-19 cm^2

the probability is equal to:

P=(1000*3x10^10*8.3x10^-19)/(100)=0.25x10^-7

b) the rate of decay is equal to:

R=B*N2*E, where B is the Einstein´s coefficient and E is the energy system

c) the number of photons is equal to:

N=(1/tsp)*(V/C*o)

Replacing:

N=100/(3*3x10^10*8.3x10^-19)

N=1.33x10^9 photons

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3 years ago

Under which circumstances would protesters’ right to assembly most likely be protected?

ICE Princess25 [194]

Answer:

Explanation:

Mob violence is never protected. Organizers are always careful about not letting things get out of hand. Not D

That remark sort of applies to C as well. Property destruction is never protected.

B is something assemblies are allowed to do. So B.

A falls into the same category as C and D. You may not like the fact that he/she is doing something illegal, but you can't take away their privacy.

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2 years ago

A race car starts from rest on a circular track of radius 378 m. The car's speed increases at the constant rate of 0.580 m/s2. A

insens350 [35]

Answer:

a) $V=14.904m/s$

b) $d = 191.49 m$

c) $t= 25.696 s$

Explanation:

From the question we are told that:

Radius $r =378m$

Acceleration $a=0.580$

a)

Generally the equation for speed of the car is mathematically given by

$a=\frac{v^2}{r}$

$V=\sqrt{a*r}$

$V=\sqrt{0.58*383}$

$V=14.904m/s$

b)

Generally the equation for distance traveled of the car is mathematically given by

$V^2=u^2+2ad$

$d=\frac{V^2}{2a}$

$d=\frac{14.904^2}{2*0.58}$

$d = 191.49 m$

c)

Generally the equation for time of the car is mathematically given by

$V=u+at$

$t=\frac{V}{a}$

$t=\frac{14.904}{0.58}$

$t= 25.696 s$

3 0

3 years ago