Answer:
Because the size of the star has expanded, the surface cools down and goes from white-hot to red-hot. Because the star is brighter, redder and physically larger than before, we dub these stars "red giants"
The density of a substance is the ratio of its mass to its volume. So whatever volume you have (call it ), the density is computed by
The most abundant gas is C. nitrogen , because nitrogen makes up 78% of earths atmosphere. the answer mostly lies mostly in three facts 1. nitrogen is volatile in most of its forms. 2. it is unreactive with materials that make up the solid earth. 3. it is very stable in the presence of solar radiation.
Answer:
t = 4.17 hours
Explanation:
given,
The distance between Sun and Neptune, d = 4.5 billion Km
= 4.5 x 10⁹ Km
= 4.5 x 10¹¹ m
The velocity of light, c = 3 x 10⁸ m/s
The velocity is always equal to displacement by the time.
<em>V = d / t m/s</em>
∴ t = d / V
= 4.5 x 10¹¹ m / 3 x 10⁸ m/s
= 15,000 s
= 4.17 h
Hence, the time taken by the light rays to reach the Neptune is, t = 4.17 h
<h2>Given;</h2><h3 /><h3>Density of metal block : 900 kg/m3</h3><h3>Weight in air of block : 60N</h3><h3>Weight of block when it is immerse in</h3><h3> paraffin wax = ? </h3><h3>Mass of block = 6kg</h3>
<h3>NOW,</h3>
<h3>Volume = 6 kg / 900 kg/m3</h3><h3> = 0.0067 m3</h3><h3>And</h3>
<h3>Mass = 800 × 0.0067 </h3>
<h3> = 5.333</h3><h3>And </h3><h3>Weight = 5.33 × 10 </h3><h3> =53.33</h3><h3 />