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
Svetlanka [38]
3 years ago
13

A light-year is _________. a. about 10 trillion kilometers the time it takes light to travel around the Sun b. about 300,000 kil

ometers per second the time it takes light to reach the nearest star
Physics
1 answer:
Vikentia [17]3 years ago
6 0

Answer:

about 10 trillion kilometers

Explanation:

c = Speed of light = 3\times 10^8\ m/s

t = Seconds in one year = 365.25\times 24\times 60\times 60

1 Light year

1\ ly=ct\\\Rightarrow 1\ ly=3\times 10^8\times 365.25\times 24\times 60\times 60=9.46728\times 10^{15}\ m\\ =9.46728\times 10^{15}\times 10^{-3}\\ =9.46728\times 10^{12}\ km\approx 10\ trillion\ km

The answer is a. about 10 trillion kilometers

You might be interested in
What is the another name for the lower fixed point?
natulia [17]
I believe another name for lower point is Ice point
3 0
3 years ago
Read 2 more answers
A car is traveling at 120 km/h (75 mph). When applied the braking system can stop the car with a deceleration rate of 9.0 m/s2.
Bumek [7]

Answer:

the number of additional car lengths approximately it takes the sleepy driver to stop compared to the alert driver is 15

Explanation:

Given that;

speed of car V  = 120 km/h = 33.3333 m/s

Reaction time of an alert driver = 0.8 sec

Reaction time of an alert driver = 3 sec

extra time taken by sleepy driver over an alert driver = 3 - 0.8 = 2.2 sec

now, extra distance that car will travel in case of sleepy driver  will be'

S_d = V × 2.2 sec

S_d = 33.3333 m/s × 2.2 sec

S_d = 73.3333 m

hence, number of car of additional car length  n will be;

n = S_n / car length

n = 73.3333 m / 5m

n = 14.666 ≈ 15

Therefore, the number of additional car lengths approximately it takes the sleepy driver to stop compared to the alert driver is 15

8 0
3 years ago
Electron grops could be considered which of the following
Maurinko [17]

Answer:

Electron groups could be considered as  Lone pair electrons and bonded pairs of electrons.

Answer: Option D & B

Explanation:

The two or more electrons can be bonded by single bond, double bond, covalent bond of electrons can simply be lone pair of electrons. Unshared pair of electrons are generally termed as lone pair of electrons in an atom which are generally present in the outermost shell of atoms. Hence electron groups can be determined by bonded pairs and lone pairs of electrons.

I got this from another brainly user

5 0
1 year ago
5
Tanya [424]

Answer:

Reset

Explanation:

Digital methods are the methods that are uses methodological outlook to study societal change and cultural condition of online data. Reset is use to disguise data In digital methods. It is use to set again and conceal data by giving the data a different form. It restores the device to the original manufacture's settings.

8 0
3 years ago
The velocity of a 1.3 kg block sliding down a frictionless inclined plane is found to be 1.26 m/s. 1.10 s later, it has a veloci
nasty-shy [4]

Answer:

\theta = 25.3^\circ

Explanation:

The acceleration of the block can be found by the kinematics equations:

v = v_0 + at\\5.88 = 1.26 + a(1.1)\\a = 4.2~m/s^2

Since the plane is frictionless, the only force acting on the block along the motion of the block is its weight.

F = mg\sin(\theta) = ma\\g\sin(\theta) = a\\(9.8)\sin(\theta) = 4.2\\\theta = 25.3^\circ

7 0
3 years ago
Other questions:
  • Please help me on 3,4 and 6. <br> Thanks
    7·1 answer
  • What is the speed of a ball thrown from 1.2m above the ground if it travels 13.7m horizontally before hitting the ground
    10·1 answer
  • The position of a 55 g oscillating mass is given by x(t)=(2.0cm)cos(10t), where t is in seconds. determine the velocity at t=0.4
    13·2 answers
  • Deposits of gold can be found in the deep ocean. Please select the best answer from the choices provided T F
    13·2 answers
  • When Jackson throws a baseball in a straight path what two forces causes the ball to eventually stop moving
    5·1 answer
  • Since all stars begin their lives with the same basic composition what characteristics most determines how they will differ
    15·1 answer
  • What is the net force required to accelerate a 884 kg car at 2 m/sec2?
    6·1 answer
  • Please round to three sig fig
    8·1 answer
  • A dog running at a speed of 12 m/s has 1,080 J of kinetic energy. What is the mass of the dog
    15·1 answer
  • Can someone pls help I’m stuck!
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!