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Usimov [2.4K]
3 years ago
10

The star nearest to our sun is Proxima Centauri, at a distance of 4.3 light-years from the sun. How far away, in km, is Proxima

Centauri from the sun?
Physics
2 answers:
Cloud [144]3 years ago
5 0

Answer: 4.068(10)^{13} km

Explanation:

A light year is a unit of length and is defined as <em>"the distance a photon would travel in vacuum during a Julian year at the speed of light at an infinite distance from any gravitational field or magnetic field. </em>"

In other words: It is the distance that the light travels in a year.

This unit is equivalent to 9.461(10)^{12}km, which mathematically is expressed as:

1Ly=9.461(10)^{12}km

Doing the conversion:

4.3Ly.\frac{9.461(10)^{12}km}{1Ly}=4.068(10)^{13}km

DaniilM [7]3 years ago
5 0

The Answer: The star closest to our sun is 4.2 light years away from the sun.

Explanation:

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A dragster runs the quarter mile in 8.96 s. What is the car's velocity (in ft/s) at the finish line?
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The first thing you should know to answer this question is the following conversion:
 1mi = 5280feet
 We have then that the speed is:
 v = ((1/4) * (5280)) / (8.96)
 v = 147.32 feet / s
 Answer:
 the car's velocity (in ft / s) at the finish line is 147.32 feet / s
7 0
3 years ago
At what speed do a bicycle and its rider, with a combined mass of 100 kg, have the same momentum as a 1400 kg car traveling at 2
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3 0
3 years ago
You have two points in a soil. Point A is at 75 cm; point B is at 25 cm above the reference. The capillary potential energy at p
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The potential energy at point A is 17.1675 J

Explanation:

The capillary potential is the work expended to bring up a unit mass of liquid to a point in a capillary region from a level liquid surface. It is the capillary potential that facilitates the movement of moisture within soil capillaries

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8 0
3 years ago
An electric current is flowing through a long cylindrical conductor with radius a. The current density J is uniform in the cylin
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Answer:

Check the explanation

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4 0
3 years ago
A scientist kept 1,000 grams of a radioactive material in a container. After 66 days, he observed that 125 grams of the radioact
bixtya [17]
The sample appears to have gone through 3 half-lives
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2nd half life: 500 to 250 g
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8 0
3 years ago
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