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Vsevolod [243]
3 years ago
8

Why do comets have tails?

Physics
1 answer:
Mice21 [21]3 years ago
6 0

Combining solar radiation pressure and solar wind blows away gas and dust from the nucleus, to what we see as a tail, is really two tails: the ion tail and the dust tail

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To ancient peoples, why were planets special?
coldgirl [10]

Answer:

Planets were like gods.

Explanation:

To the people of many ancient civilizations, the planets were thought to be deities. Our names for the planets are the Roman names for these deities. For example, Mars was the god of war and Venus the goddess of love.

7 0
3 years ago
What is a speed of a car if it covers 130 km in 2 hours?
inysia [295]

Answer:

65 km per hour

Explanation:

130/2=65

3 0
3 years ago
Read 2 more answers
n this experiment, you will measure mass and volume of various sport balls, both regularly shaped ball and irregularly shaped. W
pentagon [3]

Explanation :

Density of an object can determine using mass and volume. We can measure mass and volume of various sports ball, both regular shaped ball and irregular shaped ball.

Density for regularly shaped ball and that of irregularly shaped ball is different.

Suppose that mass of an object is 100g and the volume is 2000\ cm^3 . So, using this data we can find density of that object as

density=\frac{mass}{volume}

\rho =\frac{100}{2000}

\rho =0.05\ g/cm^3

5 0
4 years ago
Read 2 more answers
What current flows when a 35 v potential difference is imposed across a 1.4 kω resistor?
svetlana [45]

Current  =  (voltage) / (resistance)

              =    (35 volts) / (1,400 ohms)

              =         25 milliamperes 
5 0
3 years ago
Which answer shows a balanced nuclear equation for the alpha decay of plutonium-239
Sergio [31]

Answer: An alpha particle is a helium-4 nucleus, it contains gwo protons and two neutrons. So, alpha decay, giving off an alpha particle, does the following:

1)reduces the atomic number (number of just protons) by two. Plutonium has atomic number of 94, take two protons away and you are left with 92 which corresponds to uranium.

2) reduces the mass number (protons plus neutrons) by 4. If you start with 239 and subtract two protons and two neutrons, you are left with 235.

Explanation:

7 0
3 years ago
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