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2 years ago

Which statement best describes the difference between acceleration and velocity?

Physics

1 answer:

kramer2 years ago

6 0

Answer:

Explanation:

acceleration is a change in velocity which means a time rate change in velocity but velocity is the time rate change in displacement

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(m = 4.0 kg) the cockroach rides on the rim (at radius R) of a disk (M = 6.0 kg) that turns about its center like a merry-go-rou

kvasek [131]

Answer:

ω' = 2.5 rad/s

Explanation:

mass of cockroach, m = 4 kg

mass of disk, M = 6 kg

Radius of disc= R

initial angular velocity, ω = 2 rad/s

Let the final angular velocity is ω'

As no external torque is applied, so the angular momentum is constant.

Angular momentum = Moment of inertia x angular velocity

I ω = I' ω'

$\frac{1}{2}\left ( M+m \right )R^{2}\times {2} = \left (\frac{1}{2}MR^{2}+m(0.5R)^{2}) \right )\omega '$

$10R^{2} = 4R^{2}\omega '$

ω' = 2.5 rad/s

5 0

2 years ago

Sulfur hexafluoride is represented by which formula? A) sf2 b) sf7 c) s2f5 d) sf6

Margarita [4]

Since hex means 6 from Greek, the answer is D) SF6

4 0

2 years ago

Read 2 more answers

You are the science officer on a visit to a distant solar system. Prior to landing on a planet you measure its diameter to be 1.

tatiyna

(a) $2.7\cdot 10^{25} kg$

The acceleration due to gravity on the surface of the planet is given by

$g=\frac{GM}{R^2}$ (1)

where

G is the gravitational constant

M is the mass of the planet

R is the radius of the planet

Here we know:

$g=22.4 m/s^2$

$d=1.8\cdot 10^7 m$ is the diameter, so the radius is

$R=\frac{d}{2}=\frac{1.8\cdot 10^7 m}{2}=9\cdot 10^6 m$

So we can re-arrange eq.(1) to find M, the mass of the planet:

$M=\frac{gR^2}{G}=\frac{(22.4 m/s^2)(9\cdot 10^6 m)^2}{6.67\cdot 10^{-11}}=2.7\cdot 10^{25} kg$

(b) $4.8\cdot 10^{31}kg$

The planet is orbiting the star, so the centripetal force is equal to the gravitational attraction between the planet and the star:

$m\frac{v^2}{r}=\frac{GMm}{r^2}$ (1)

where

m is the mass of the planet

M is the mass of the star

v is the orbital speed of the planet

r is the radius of the orbit

The orbital speed is equal to the ratio between the circumference of the orbit and the period, T:

$v=\frac{2\pi r}{T}$

where

$T=402 days = 3.47\cdot 10^7 s$

Substituting into (1) and re-arranging the equation

$m\frac{4\pi r^2}{rT^2}=\frac{GMm}{r^2}\\\frac{4\pi r}{T^2}=\frac{GM}{r^2}\\M=\frac{4\pi r^3}{GMT^2}$

And substituting the numbers, we find the mass of the star:

$M=\frac{4\pi^2 (4.6\cdot 10^{11} m)^3}{(6.67\cdot 10^{-11})(3.47\cdot 10^7 s)^2}=4.8\cdot 10^{31}kg$

4 0

2 years ago

How has access to the source code of proprietary software?

Amiraneli [1.4K]

Proprietary software is the software that is owned by an individual or the company that developed it.
<span><span>Source code is the basic component of a computer program and it </span>is the only component where a programmer can read and modify a computer program.</span>
<span>The source code for proprietary <span>software is closed. Only the programmers who have made the software have access to the source code. </span></span>

6 0

2 years ago

Read 2 more answers

HELP 50 POINTS TO ANY WHO GETS THIS RIGHT

Anuta_ua [19.1K]

<h2>Positive Affects:</h2>

Technology aids in the research of curing diseases or other environmental problems. Without technology, we would not have been able to eradicate diseases like polio.
Technology allows us to communicate to people quicker, in spite of the distance and conditions.

<h2>Negative</h2>

Over-dependence of technology makes humans lazy. We won't be paying much attention because everything is available on Google.
There are health affects due to the radiation. Our vision gets weakened and the laziness can lead to physical problems like obesity and fatigue.

5 0

2 years ago