Which has greater kinetic energy, a car traveling at 40 mph or a half-as-massive car traveling at 80 mph?

The first astronomer to show that spiral nebulae (today called spiral galaxies) have large Doppler shifts was

solong [7]

William Parsons was the first astronomer to show that spiral nebulae have large Doppler shifts.

<h3>What are Spiral nebulae?</h3>

In space, a nebula is a huge cloud of gas and dust. Some nebulae, including multiple nebulae, are made of gas and dust that have been released from the explosion of a dead star called a supernova. There are other nebulae that are star-forming regions.
Edwin Hubble began observing Cepheid variables in many spiral nebulae, including the alleged Andromeda Nebula, in 1923, demonstrating that they are, in fact, full-fledged galaxies outside our own. Since then, the phrase spiral nebula has lost favor.
One group of astronomers believed that spiral nebulae were parts of our Milky Way galaxy, whereas the other group believed that these objects were actual galaxies that were outside of the Milky Way galaxy.

To learn more about Nebulae visit:

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8 0

2 years ago

The atmospheric temperature decreases when snow starts melting because the snow releases thermal energy from the atmosphere to m

Sergeeva-Olga [200]

Answer:

This assertion is false

Explanation:

It can be a said that when snow melts to liquid, then at that phase certain amount of energy was needed to change it from its solid state to liquid. The energy needed is given as:

Q=mL

Where m is the mass of snow.

L is latent heat of fusion.

So when there is the melting of snow from solid to liquid, thermal energy gotten from the surrounding gets absorbed so as to convert it into liquid phase.

5 0

3 years ago

Read 2 more answers

According to the Universal Law of Gravitation, every object attracts every other object in the universe. Why can’t you feel the

inessss [21]

Mars is officially frank gallagers son

6 0

3 years ago

A simple pendulum is used to determine the acceleration due to gravity at the surface of a planet. The pendulum has a length of

Dafna1 [17]

Answer:

- pendulum use to determine acceleration

Explanation:

by calculating need to understand first the problem

the length is measure to be 2s

the lenght is also 2

2 obtainer on invistigation the most nearly is 8.

5 0

3 years ago

A heat engine receives heat of 400kW from a heat source of 1100 K, and rejects the waste heat into a heat sink at 320K. It gener

GuDViN [60]

Answer:

Explanation:

efficiency of carnot engine operating between 1100 K and 320 K

= 1100 - 320 / 1100

= .709

efficiency of heat engine = 120 / 400 = .30

2 nd law thermal efficiency of heat engine = .30 x 100 / .709

= 42.31 % .

4 0

3 years ago