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Andrews [41]
4 years ago
10

Which of the following elements would be predicted to be the best conductor of electricity? - sodium (Na) - germanium (Ge) - sul

fur (S) - neon (Ne)
Physics
1 answer:
Anton [14]4 years ago
4 0

Answer:

sodium

Explanation:

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A rock occupies a volume of 2cm3 and has a mass of 54 grams. find the density of this rock.
MaRussiya [10]
Density is Mass divided by Volume, or; 
D=\frac{M}{V}\\D=\frac{54g}{2cm^{3}}=27\frac{g}{cm^{3}}
Your answer is 27 g/cm³.
5 0
3 years ago
For lunch you and your friends decide to stop at the nearest deli and have a sandwich made fresh for you with 0.300 kg of Italia
Marina CMI [18]

Answer:

Part a)

A = 0.0581 m

Part b)

T = 0.37 s

Explanation:

Slice is dropped on the plate from height 0.250 m

so the speed of the slice while it hit the plate is given as

v = \sqrt{2gh}

here we know that

v = \sqrt{2(9.81)(0.250)}

v = 2.21 m/s

now from momentum conservation

mv = (m + M)v_f

m = 0.300 kg

M = 0.400 kg

from the above equation we have

0.300 (2.21) = (0.300 + 0.400) v_f

v_f = 0.95 m/s

Now the initial mean position while it will not hit the plate is given as

0.400 (9.81) = 200 x_1

x_1 = 0.01962 m

now when slice is placed on the plate then the new mean position will be given as

(0.300 + 0.400)9.81 = 200 x_2

x_2 = 0.0343 m

now we know that speed of SHM is given as

v = \omega\sqrt{A^2 - x^2}

here we have

\omega = \sqrt{\frac{k}{m + M}}

\omega = \sqrt{\frac{200}{0.300 + 0.400}}

\omega = 16.9 rad/s

a = x_2 - x_1 = 0.0343 - 0.01962 = 0.0147 m

now from above formula

0.95 = 16.9\sqrt{A^2 - 0.0147^2}

A = 0.0581 m

Part b)

Time period of scale is given as

T = \frac{2\pi}{\omega}

T = \frac{2\pi}{16.9}

T = 0.37 s

8 0
3 years ago
A 1.5 m wire carries a 9A current when a potential difference of 84 v is applied. what is the resistance of the wire
WARRIOR [948]
Ohm's law states that I=V/R (Current=volts divided by resistance). Since we're looking for resistance, we'll rewrite it as R=V/I. Then just plug in the numbers; R=84/9, R= 9 1/3 or 28/3. The resistance of the wire is 9.33... or 9 1/3 ohm's, depending on how you wanna write it.
8 0
4 years ago
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Answer:

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