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3 years ago

14

When the core of a star like the sun uses up its supply of hydrogen for fusion, the core begins to ________?

2 answers:

pav-90 [236]3 years ago

4 0

When the core of a star like the sun uses up its supply of hydrogen for fusion, the core begins to contract in size. The gravitational forces becomes strong and cause the star to reduce in size. as the star contracts, the temperature of the star also rises since the heat is distributed inside smaller Volume now.

Marrrta [24]3 years ago

3 0

Its core contracts, but its outer layers expand and the star becomes bigger and brighter.

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The edge effect in habitats are caused by:

uysha [10]

Answer:

A. habitat fragmentation

Explanation:

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3 years ago

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An unfortunate astronaut loses his grip during a spacewalk and finds himself floating away from the space station, carrying only

alexira [117]

Answer:

The answer is " $2.352 \ \frac{m}{s}$ "

Explanation:

$\to mass(m_1)=102 \ kg\\\\\to mass(m_2)=10 \ kg \\\\\to v=2.10\ \frac{m}{s}\\\\$

momentum before:

$\to p=(m_1+m_2)v$

$=(102+10)2.10\\\\=(102\times 2.10 +10 \times 2.10)\\\\=214.2+21\\\\=235.2$

momentum After:

$\to p=(m_1+m_2)v$

$=(102\times 0 +10 \times v)\\\\ =(0 +10v)\\\\=10v\\$

Calculating the conservation of momentum:

$\to \text{momentum before = momentum After}$

$\to 235.2=10v\\\\\to v= \frac{235.2}{10}\\\\ \to v=2.352 \ \frac{m}{s}$

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2 years ago

Ice floats in water because it is______ than matter

Neko [114]

Answer:

Less dense than water

Explanation:

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3 years ago

An 8-m-diameter hot air ballooon that has a total mass of 400 kg isstanding still in air on a windless day. The balloon suddenly

Bezzdna [24]

Answer:

The value of acceleration of the balloon a = 2.9 $\frac{m}{s^{2} }$

Explanation:

Diameter = 8 m

Mass = 400 kg

Speed V = 50 $\frac{km}{hr}$ = 13.89 $\frac{m}{s}$

Coefficient of drag $C_D$ = 0.2 for air

Area = $\pi (4^{2} )$ = 50.24 $m^{2}$

We know that force on the balloon is given by

$F = \frac{1}{2} \rho A V^{2} C_D$

Put all the values in above equation we get

$F = \frac{1}{2} (1.2) (50.24) (13.89)^{2}$ × 0.2

F = 1163.15 N

Now acceleration of the balloon is given by

$a = \frac{F}{m}$

$a = \frac{1163.15}{400}$

a = 2.9 $\frac{m}{s^{2} }$

This is the value of acceleration of the balloon.

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3 years ago

What is the difference in electrical potential energy between two places in an electric field?

Phoenix [80]

Answer: Option (c) is the correct answer.

Explanation:

The difference in electrical potential energy between two places in an electric field is known as potential difference.

Mathematically, potential difference between two given points can be written as follows.

$\Delta V = V_{2} - V_{1}$

where, $\Delta V$ = potential difference

$V_{1}$ = potential at point 1

$V_{1}$ = potential at point 2

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3 years ago

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