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Mamont248 [21]
2 years ago
10

How many sides does a dodecahedron have?

Physics
2 answers:
Serhud [2]2 years ago
8 0

Answer:

twelve facesFrom left to right the solids are tetrahedron (four sides), cube (six sides), octahedron (eight faces), dodecahedron (twelve faces), and icosahedron (twenty faces).

Explanation:

Ayo hope you enjoy

hram777 [196]2 years ago
5 0

Answer:

12 side (:

Explanation:

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At time t=0 a grinding wheel has an angular velocity of 28.0 rad/s . It has a constant angular acceleration of 35.0 rad/s2 until
notsponge [240]

Answer:

a).x_{t}=583.3rad

b).t_{total}=10.52s

c).a=12.62 \frac{rad}{s^2}

Explanation:

The angular acceleration is constant so we can use the formulas of uniform motion with the model of angular acceleration

a).

x_{r}=x_{i}+v_{i}+\frac{1}{2}a_{a}*t^2

x_{r}=0+28.0\frac{rad}{s}*2.20s+\frac{1}{2}*35.0\frac{rad}{s^2}*2.20s

x_{r}=146.3rad

so the total angle between t=0 and the time it stopped is

x_{t}=146.3rad+437rad=583.3rad

b).

w_{f}=w_{o}+a*t

w_{f}=28.0rad/s+35rad/s^2*2.2s=105rad/s=w_{o}

x_{t}-x_{r}=\frac{1}{2}*(w_{o}-w_{f})*t

583.3-146.3=\frac{1}{2}*(105-0)*t

t=\frac{437rad}{105\frac{rad}{s}}=8.32s

t_{total}=8.32+2.2=10.52s

c).

w_{f}=w_{o}+a*t

0=105 rad/s+a*8.32s

a=\frac{105 rad/s}{8.32s}

a=12.62 \frac{rad}{s^2}

7 0
3 years ago
You are a doctor and Jack is your patient. Jack wants to know about his overall health. What is the best thing you can do to hel
Novay_Z [31]

Answer:

determine his body composition

Explanation:

5 0
3 years ago
How does a pin hole camera work? And how do we see through them?
DIA [1.3K]
A pinhole camera<span> is a simple </span>camera<span> without a lens but with a tiny aperture, a</span>pinhole<span> – effectively a light-proof box with a small hole in one side. Light from a scene passes through the aperture and projects an inverted image on the opposite side of the box, which is known as the </span>camera<span> obscura effect.</span>
6 0
3 years ago
Read 2 more answers
Two engineering students, John with a weight of 96 kg and Mary with a weight of 48 kg, are 30 m apart. Suppose each has a 0.04%
djyliett [7]

Answer:

6.8370869499\times 10^{20}\ N

Explanation:

N_A = Avogadro's number = 6.022\times 10^{23}

e = Charge of electron = 1.6\times 10^{-19}\ C

k = Coulomb constant = 8.99\times 10^{9}\ Nm^2/C^2

Z = Atomic number of water = 18

M = Molar mass of water = 0.018 kg/mol

m = Mass of person

The charge is given by

q=imbalance\times n\times e

Total number of protons and electrons in each sphere

n=\dfrac{mN_AZe}{M}

q=imbalance\times \dfrac{mN_AZe}{M}

q_1=0.0004\times \dfrac{96\times 6.022\times 10^{23}\times 18\times 1.6\times 10^{-19}}{0.018}\\\Rightarrow q_1=3699916.8\ C

q_2=0.0004\times \dfrac{48\times 6.022\times 10^{23}\times 18\times 1.6\times 10^{-19}}{0.018}\\\Rightarrow q_1=1849958.4\ C

Electrical force is given by

F=\dfrac{kq_1q_2}{r^2}\\\Rightarrow F=\dfrac{8.99\times 10^{9}\times 3699916.8\times 1849958.4}{30^2}\\\Rightarrow F=6.8370869499\times 10^{20}\ N

The electrostatic force of attraction between them is 6.8370869499\times 10^{20}\ N

4 0
3 years ago
Gold in its pure form is too soft to be used for most jewelry. Therefore, the gold is mixed with other metals to produce an allo
Novay_Z [31]

Answer:

Explanation:18kt alloy contains

i) 75% of gold

rhogold=19.3g/cm^3

=75/100×19.3

=14.475g/cm^3

ii) 16% of silver

rhosilver=10.5g/cm^3

=16/100×10.5

=1.68g/cm^3

iii) 9% of copper

rhocopper =8.90g/cm^3

=9/100×8.9

=0.801g/cm^3

Overall density of 18kt gold

=(0.801+1.68+14.475)g/cm^3

=16.956g/cm^3

=17g/cm^3 to 3s.f

6 0
3 years ago
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