life on Earth, chemistry homework help

December 8, 2020/in Science Assignment Help /by admin

Please answer only if you know about science. Please answer the questions below:

I also attached some examples.

1. According to current scientific understanding, life on Earth

(a) was exceedingly improbable.

(b) arose quite soon after conditions allowed it.

(c) may have been inevitable, but took billions of years to arrive.

2. If we sent one of our current spacecraft to a nearby star (besides the Sun), the trip

would take about

(a) a decade

(b) a century

(c) 100,000 years

II. Short Answers (1 pt each)

3. What do we mean by a habitable world? Does a habitable world necessarily have

life?

4. How did the Copernican revolution affect scholarly thought regarding the

question of life beyond Earth?

“1

III. Quantitative problems (1 pt each; To receive full credit, SHOW ALL WORK!)

5. Communication with Mars. We use radio waves, which travel at the speed of

light, to communicate with spacecraft. How long does it take a message to travel

from Earth to a spacecraft on Mars when:

(a) Mars is at its closest distance to Earth

(b) Mars is at its furthest distance from Earth.

(Data: The distance from Earth to Mars ranges between about 56 million and 400

million kilometers.)

6. Interstellar Travel. Our fastest current spacecraft travel away from Earth at a

speed of roughly 50,000 km/hr. At this speed, how long would it take to travel the

4.4 light year distance to Alpha Centauri, the nearest star system to our own?

(Hint: Recall that a light year is approximately 9.5×1012 km.)

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