3 years ago

Which element is a metal? A.lithium B.Nitrogen C.sulfur D.chlorine

Physics

1 answer:

tester [92]3 years ago

8 0

Answer:

the answer is b

Explanation:

hope it helps ...

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In a laboratory, you determine that the density of a certain solid is 5.23×10−6kg/mm3. Convert this density into kilograms per c

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Answer:

1 mm^3 = 1.0 x 10^-9 m³

Hence;

5.23 x 10^-6 kg/mm^-3 = (5.23 x 10^-6 kg)/ 1x10^-9 m³

= 5230 kg/m³

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3 years ago

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Pulley, Lever and a Bicycle are all compound machines

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3 years ago

How much work in joules must be done to stop a 920-kg car traveling at 90 km/h?

tankabanditka [31]

Answer:

Work done, W = −287500 Joules

Explanation:

It is given that,

Mass of the car, m = 920 kg

The car is travelling at a speed of, u = 90 km/h = 25 m/s

We need to find the amount of work must be done to stop this car. The final velocity of the car, v = 0

Work done is also defined as the change in kinetic energy of an object i.e.

$W=\Delta K$

$W=\dfrac{1}{2}m(v^2-u^2)$

$W=\dfrac{1}{2}\times 920\ kg(0-(25\ m/s)^2)$

W = −287500 Joules

Negative sign shows the work done is done is opposite direction.

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3 years ago

The eccentricity of an asteroid's orbit is 0.0442, and the semimajor axis is 1.12 x 1011 m. The Sun's center is at one focus of

nadezda [96]

Answer:

a. $d=99x10^{8}m$

b. $r=14.22 R_s$

Explanation:

The eccentricity of an asteroid's is 0.0442 so

to find the focus distance between both focus is

$d=2*e*a$

$e=1.12x10^{11}m\\a=0.0442$

So replacing numeric

$d=2*1.12x10^{11}m*0.0442=9900800000$

$d=99x10^{8}m$

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$r=\frac{d_1}{d_s}$

$r=R_s*\frac{99x10^8m}{6.96x10^8m}$

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Mass number of an atom with 11 protons

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The atomic mass of sodium (Na) is 22.98977

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