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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)

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.

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4 years ago

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geniusboy [140]

Answer:

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3 years ago

Which sizes influence the adhesive and rolling friction?

julsineya [31]

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