4 years ago

How long is a light year?

Physics

2 answers:

VashaNatasha [74]4 years ago

6 0

A light year is = to 9.461 × 1015 metres

Airida [17]4 years ago

4 0

-- Imperial & US units‎: ‎5.8786×10¹² mi
-- Metric (SI) units‎: ‎9.4607×10¹⁵ m
-- Astronomical units‎: ‎6.3241×10⁴ AU

You might be interested in

An engine draws energy from a hot reservoir with a temperature of 1250 K and exhausts energy into a cold reservoir with a temper

bixtya [17]

Answer:

a. $P=18.61\ W$

b. $\eta_c=0.6976=69.76\%$

c. $\eta=0.4718=47.18\%$

Explanation:

Given:

temperature of the hotter reservoir, $T_H=1250\ K$

temperature of the colder reservoir, $T_C=378\ K$

heat absorbed by the engine, $Q_H=1.42\times 10^{5}\ J$

heat rejected to the cold reservoir, $Q_L=7.5\times 10^4\ J$

time duration of the energy transfer, $t=1\ hr=3600\ s$

<u>Now the work done by the engine:</u>

Using energy conservation,

$W=Q_H-Q_L$

$W=14.2\times 10^4-7.5\times 10^4$

$W=6.7\times 10^4\ J$

<u>Hence the power output:</u>

$P=\frac{W}{t}$

$P=\frac{6.7\times 10^4}{3600}$

$P=18.61\ W$

$\eta_c=1-\frac{T_L}{T_H}$

$\eta_c=1-\frac{378}{1250}$

$\eta_c=0.6976=69.76\%$

now actual efficiency:

$\eta=\frac{W}{Q_H}$

$\eta=\frac{6.7\times 10^4}{1.42\times 10^{5}}$

$\eta=0.4718=47.18\%$

6 0

4 years ago

WILL MARK BRAINLIEST IF THE ANSWER IS CORRECT Vinegar and baking soda react to form sodium acetate (NaC2H3O2), water (H2O), and

TEA [102]

D. 3, hope this helps

4 0

3 years ago

The wind at 5000 feet agl is southwesterly while the surface wind is southernly. this difference in direction is primarily due t

harkovskaia [24]

The friction between the wind and the surface

7 0

3 years ago

Need some help with homework but where doing it in class rn

Brilliant_brown [7]

Answer:

now it lets me. B

Explanation:

hope that helps

6 0

3 years ago

When recyclable materials are sent to a recycling plant, they are often not sorted in any particular way. Plastic materials migh

4vir4ik [10]

Answer:

by applying a magnetic force to recycled materials

8 0

3 years ago

Read 2 more answers