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Sergeeva-Olga [200]

2 years ago

8

How do human population growth trends differ between developed nations and developing nations?

1 answer:

ololo11 [35]2 years ago

4 0

Answer:

Replacement-Level Fertility

Another important population characteristic that differ btw develop nation and developing nations is relates to births is replacement-level fertility. Replacement-level fertility is the fertility rate that will result in the replacement of the parents in the population. Again, in an ideal world, the human replacement-level fertility rate would be exactly two. This would mean that each couple would produce two offspring that would replace them in the population. If this occurred, then the human population would stay at a stable rate

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At which position (1,2,3, or 4) does the roller coaster car have the most potential energy? Why?

julsineya [31]

At 1 because the cart is still at the top

3 0

3 years ago

A spherical balloon has a radius of 6.55 m and is filled with helium. The density of helium is 0.179 kg/m3, and the density of a

Ksju [112]

Answer:

$M_1 = 317.7 kg$

Explanation:

Mass of the helium gas filled inside the volume of balloon is given as

$m = \rho V$

$m = 0.179(\frac{4}{3}\pi R^3)$

$m = 0.179(\frac{4}{3}\pi 6.55^3)$

$m = 210.7 kg$

now total mass of balloon + helium inside balloon is given as

$M = 210.7 + 990$

$M = 1200.7 kg$

now we know that total weight of balloon + cargo = buoyancy force on the balloon

so we will have

$(M + M_1)g = \rho_{air} V g$

$(1200.7 + M_1) = (\frac{4}{3}\pi 6.55^3) (1.29)$

$1200.7 + M_1 = 1518.4$

$M_1 = 317.7 kg$

3 0

3 years ago

An isolated conducting sphere has a 10 cm radius. One wire carries a current of 1.000 002 0 A into it. Another wire carries a cu

romanna [79]

Answer:

t = 5.56 ms

Explanation:

Given:-

- The current carried in, Iin = 1.000002 C

- The current carried out, Iout = 1.00000 C

- The radius of sphere, r = 10 cm

Find:-

How long would it take for the sphere to increase in potential by 1000 V?

Solution:-

- The net charge held by the isolated conducting sphere after (t) seconds would be:

qnet = (Iin - Iout)*t

qnet = t*(1.000002 - 1.00000) = 0.000002*t

- The Volt potential on the surface of the conducting sphere according to Coulomb's Law derived result is given by:

V = k*qnet / r

Where, k = 8.99*10^9 ..... Coulomb's constant

qnet = V*r / k

t = 1000*0.1 / (8.99*10^9 * 0.000002)

t = 5.56 ms

7 0

3 years ago

Steam is more dangerous than the boiling water because it has more a.Temperature

balandron [24]

Answer:

c) heat

Explanation:

steam has more heat energy than boiling water due to its latent heat of vaporisation.

4 0

2 years ago

A force is applied to a block to move it up a 30° incline. The incline is frictionless, the block is initially at rest, F= 65.0

muminat

Answer:

0.96 m, upward

Explanation:

$\theta=30^{\circ}$

$F=65 N$

$M=5 kg$

Initial velocity, u=0

$t=0.550 s$

$Fcos\theta-Mgsin\theta=Ma$

Where $g=9.8 m/s^2$

Substitute the values

$65cos30-5\times 9.8sin30=5a$

$31.8=5a$

$a=\frac{31.8}{5}=6.36 m/s^2$

$S=ut+\frac{1}{2}at^2$

$S=0+\frac{1}{2}(6.36)(0.55)^2=0.96 m$

Hence,the block moves upward because displacement is positive.

7 0

3 years ago