1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Genrish500 [490]
3 years ago
5

A. The distance to a star is approximately 8.58 ✕ 10^18 m. If this star were to burn out today, in how many years would we see i

t disappear?
b. How long does it take sunlight to reach Earth?
c. How long does it take for a microwave radar signal to travel from Earth to the Moon and back?
Physics
1 answer:
Tamiku [17]3 years ago
7 0

Answer:

906.27931 years

8.34 minutes

2.56266 seconds

Explanation:

v = Velocity of light = 3\times 10^8\ m/s

s = Distance

Time is given by

t=\dfrac{s}{v}\\\Rightarrow t=\dfrac{8.58\times 10^{18}}{3\times 10^8\times 365.25\times 24\times 3600}\\\Rightarrow t=906.27931\ years

We would see the star disappear after 906.27931 years after it actually disappeared.

Distance between Earth and Sun = 150.18 billion m

t=\dfrac{150.18\times 10^9}{3\times 10^8\times 60}\\\Rightarrow t=8.34\ minutes

It takes 8.34 minutes for sunlight to reach Earth.

Distance between Earth and Moon = 384.4 million m

t=\dfrac{2\times 384.4\times 10^6}{3\times 10^8}\\\Rightarrow t=2.56266\ s

It takes 2.56266 seconds for a microwave radar signal to travel from Earth to the Moon and back.

You might be interested in
What are possible units for impulse? Check all that apply. kg • m kg • N • s N • m
Vlada [557]

We know that impulse is simply the product of Force and time:

Impulse = Force * time

 

Since Force has a unit of Newton or kg m/s^2 and time is in seconds, therefore impulse can have units as:

N s

or

<span>kg m/s</span>

4 0
3 years ago
A wooden cube with the mass of 1kg is placed on a frictionless plane that makes an angle of 30° with the floor.
Anni [7]

Answer:

I dont know

Explanation:

8 0
2 years ago
A 500-n crate needs to be lifted 1 meter vertically in order to get it into the back of a pickup truck. what gives the crate a g
worty [1.4K]
The weight an weight of the truck 
6 0
3 years ago
Read 2 more answers
Which quantity is a scalar quantity?
Vsevolod [243]
The answer is Area ,area
5 0
2 years ago
A solid sphere of mass 8.6 kg, made of metal whose density is 3,400 kg/, hangs by a cord. When the sphere is immersed in a liqui
creativ13 [48]

Answer:

A.1900 kg/m^3

Explanation:

We are given that

m=8.6 kg

Density,\rho_s=3400 kg/m^3

Tension,T=38 N

We have to find the density of liquid.

T=mg-\rho_l Vg

g=9.8 m/s^2

Volume,V=\frac{m}{\rho_s}

38=8.6\times 9.8-\rho_l\times \frac{8.6}{3400}\times 9.8

\rho_l\times \frac{8.6}{3400}\times 9.8=8.6\times 9.8-38

\rho_l=\frac{(8.6\times 9.8-38)\times 3400}{8.6\times 9.8}

\rho_l=1867kg/m^3\approx 1900 kg/m^3

Option A is true.

4 0
3 years ago
Other questions:
  • The primary service used by stations to exchange mac frames when the frame must traverse the ds to get from a station in one bss
    10·1 answer
  • How can operators avoid damaging Submersed Aquatic Vegetation (SAV) beds that are usually found in shallow areas of water?
    15·1 answer
  • The universe is filled with photons left over from the Big Bang that today have an average energy of about 4.9 ✕10-4 (correspond
    12·1 answer
  • To travel from australia to south africa which direction would you go
    14·1 answer
  • When a pair of balanced forces acts on an object, the net force that results is
    10·2 answers
  • A brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a force of 800 N on him. The
    10·1 answer
  • Newton's third law is sometimes summarized as "for every action, there's an equal opposite reaction" but when you jump from eart
    15·1 answer
  • An atom with the expected number of neutrons, protons, and electrons is called a(n)
    5·1 answer
  • When does a bouncing ball have the least amount of kinetic energy?
    5·2 answers
  • The newton is defined as the:
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!