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ziro4ka [17]
4 years ago
8

How long does it take light from the nearest star other than the Sun to reach Earth? A) Less than 1 second B) About 1 hour C) Ab

out 1 month D) About 4 years
Chemistry
1 answer:
andrew-mc [135]4 years ago
5 0

Your answer should be D. About 4 years. Hope this helps! =^-^=

<em>(The light reflected from the surface of the Moon takes only a second to reach Earth. The Sun is more than 8 light-minutes away. And so, if the light from the nearest star (Alpha Centauri) takes more than 4 years to reach us, we're seeing that star 4 years in the past.) Quora.com</em>

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Which statement about concentration cells is correct?
Annette [7]

Answer:

The answer is D. The concentrations are different and the reactions are different, so the cell potential is 0.00 volts.

Explanation:

A concentration cell is an electrolytic cell that is comprised of two half-cells with the same electrodes, but differing in concentrations. A concentration cell acts to dilute the more concentrated solution and concentrate the more dilute solution, creating a voltage as the cell reaches an equilibrium.

7 0
3 years ago
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The specific heat capacity of a certain type of cooking oil is 1.75 J/(g⋅∘C). What is the amount of heat exchanged when the temp
anygoal [31]

Answer:

Q = -811440 J

Explanation:

Given data:

Mass of oil = 2.76 Kg (2.76× 1000 = 2760 g)

Initial temperature = 191 °C

Final temperature = 23°C

Specific heat capacity of oil = 1.75 J/g.°C

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 23°C - 191 °C

ΔT = -168°C

Q = 2760 g ×1.75 J/g.°C  ×-168°C

Q = -811440 J

Negative sign show heat is released.

6 0
3 years ago
What’s the answer plz help quick ?????
UNO [17]

Your independent variable would be salt because it doesn't change the only thing that changes is the water.

7 0
3 years ago
1. What is the kinetic energy of 44 kg cheetah running at 31m/s speed?
Vanyuwa [196]

Explanation:

Given

mass (m) = 44 kg

velocity (v) = 31 m/s

Now

Kinetic energy

= 1/2 mv²

= 1/2 * 44 * 31²

= 0.5 * 44 * 961

= 21142 joule

Hope it will help you :)

3 0
3 years ago
If someone is whispering, but you can't hear them, how do you fix that problem?
Maurinko [17]
I'D SAY D IS THE ANSWER
5 0
3 years ago
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