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3 years ago

6

When is the world going to end? Give me your opinions and the reasons why you think that.

1 answer:

Novay_Z [31]3 years ago

5 0

Answer:

probably when the next pandemic happens

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Using Kepler's 3rd law and Newton's law of universal gravitation, find the period of revolution P of the planet as it moves arou

weeeeeb [17]

Answer:

$P = \pi \sqrt{\frac{(R_1+R_2)^3}{2 \ GMS}}$

Explanation:

From the attached diagram below:

AC = a (1 + e) = R₂ -------- equation (1)

CD = a ( 1 - e) = R₁ --------- equation (2)

⇒ 1 - e = $\frac{R_1}{a}$

$e= 1 - \frac{R_1}{a}$

Replacing the value for e into equation (1)

$a(1+1- \frac{R_1}{a})= R_2$

$= 2a - R_1 = R_2$

$a= \frac{R_1+R_2}{2}$

From Kepler's third law;

$P = 2 \pi \sqrt{\frac{a^3}{GMS}}$

$P = 2 \pi \sqrt{\frac{(R_1+R_2)^3}{8GMS}}$

$P = \pi \sqrt{\frac{(R_1+R_2)^3}{2 \ GMS}}$

5 0

3 years ago

A student who weighs 500 newtons climbed the stairs from the first floor to the third floor,15 meters above, in 20 seconds. How

igor_vitrenko [27]

Well, the 20 seconds gives us enough information to actually calculate the power she has on her feet :)
Well, the work is 500*15=7500J, that is 7.5 kJ or about 18 calories (1 cal is 418J?) The power is that 7.5 kJ divided by 20 seconds: 375W. That's... OK, I suppose...

5 0

3 years ago

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A tourist averaged 82km/hr for a 6.5h trip in her volkswagen. how far did she go?

Whitepunk [10]

82 ÷ 6.5 = 12.615384615384... repeating
round = 12.6
12.6 · 6.5 = 81.9
round = 82
She went an average of 12.6 km an hour
Hope this helps! ;)

4 0

3 years ago

An aluminum wire with a diameter of 0.115 mm has a uniform electric field of 0.235 V/m imposed along its entire length. The temp

tekilochka [14]

Answer with Explanation:

We are given that

Diameter of coil=d=0.115mm

Radius, r= $\frac{d}{2}=\frac{0.115}{2}=0.0575mm=0.0575\times 10^{-3} m$

Using $1mm=10^{-3} m$

Electric field=E=0.235V/m

T=55 degree C

$T_0=20^{\circ} C$

$\rho_0=2.82\times 10^{-8}\Omega m$

$\alpha=3.9\times 10^{-3}/C$

(a).We know that

$\rho=\rho_0(1+\alpha(T-T_0))$

Substitute the values

$\rho=2.82\times 10^{-8}(1+3.9\times 10^{-3}(55-20))$

$\rho=3.2\times 10^{-8}\Omega m$

(b).Current density, $J=\frac{E}{\rho}$

Using the formula

$J=\frac{0.235}{3.2\times 10^{-8}}=7.3\times 10^6A/m^2$

c.Total current,I=JA

Where $A=\pi r^2$

$\pi=3.14$

Using the formula

$I=7.3\times 10^6\times 3.14\times (0.0575\times 10^{-3})^2$

I=0.076A

d.Length of wire=l=2m

$V=El$

Substitute the values

$V=0.235\times 2=0.47 V$

5 0

3 years ago

Mrs. Brown's class is studying magnets and electricity. At the end of the unit Claire states that magnets and electricity are bo

Gwar [14]

Answer:

Magnets can create electricity and electricity can create a magnetic force.

Both electric charges and magnets do not have to touch an object in order to exert a force on it.

Electromagnets use electricity to create a magnetic force.

Explanation:

7 0

3 years ago

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