What is a light year??????????

Answers

Answer 1

Answer: A light-year is a distance.

It's the distance that light travels through vacuum in one year.

The distance is 9.4607 x 10¹² kilometers in metric units, and 5.8786 x 10¹² miles
in 'customary' units, and is normally written without a bunch of question marks.

Answer 2

Answer: A light year is an unit of distance.

$light year$ ≈ $10^1^3km$

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A small plastic sphere with a charge of -6.0 nC is near another small plastic sphere with a charge of -14 nC . If the spheres repel one another with a force of magnitude 8.3×10−4 N , what is the distance between the spheres?
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A stone is thrown straight up from the roof of an 80 ft building. the height, in feet, of the stone at any time t, in seconds, measured from the ground is given by ℎ(????) = −16???? 2 + 64???? + 80. what is the maximum height the stone reaches?
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A bicyclist is in a 50-km race. He says he had an average velocity of 35. What is missing in the cyclist’s velocity? A. units only B. units and distance C. direction only D. units and direction

Answers

A. Units
the rest can be understand that he did not clarify

2. A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius r. A passenger feels the seat of the car pushing upward on her with a force equal to five times her weight as she goes through the dip. Of r = 21.5 m, how fast is the roller coaster traveling at the bottom of the dip?

Answers

Answer: $v=√(4gr)$

Explanation:

Given

Passenger feels the seat of the car Pushing upward with a force equal to five times her weight

Therefore

$N-mg=(mv^2)/(r)$

it is given $N=5mg$

where N=normal reaction

$5mg-mg=(mv^2)/(r)$

thus $v=√(4gr)$

State the relationship between degrees Celsius and kelvins

Answers

Kelvin is a unit of absolute temperature and is often used in measurements and it can also be associated with degrees Celsius. 0 Kelvin is equivalent to -273.15 degrees Celsius.

In order to solve for either unit of temperature, the equation is:

T(Kelvin)= T(degrees Celsius) + 273.15
T(degrees Celsius) = T(Kelvin) - 273.15

1. On which date does the Antarctic Circle have 24 hours of daylight? A. June 21B. March 21
C. September 21
D. December 21

2. When energy is transferred to air, what happens to the particles of air? A. They move slower.
B. They move faster.
C. They cool down.
D. none of the above

Answers

The date in which the Antarctic Circle has 24 hours of daylight on December 21st every year. When energy is transferred to air the particles of air become more excited and move around faster.

1. On which date does the Antarctic Circle have 24 hours of daylight?

the answer is D

2. when energy is transferred to air, what happens to the particles of Air?

the answer is B

HOPE THIS HELPED

HELP!! Worth a lot of points :)
(Physics question)

Answers

It's B if that helps at all :) (I'm like, 98% sure that it's totally B!

my answer would be B.
Source:
i had this question before.
Hope that this helps you! =)

The speed of sound waves through two different media, steel and air, was recorded. According to the graph, sound waves travel. A) through steel, but not through air
B) faster through steel than through air
C) faster through air than through steel
D) through steel and air at similar speeds

Answers

Answer: The correct answer is Option B.

Explanation:

Sound waves are a type of longitudinal waves. These waves are the waves in which particles of the medium travel in the direction of the wave. These waves require a medium to travel.

Sound waves travel faster in solids than in the gaseous medium because the particles in solid state lie close to each other and the vibrations of the sound waves travel faster when the particles lie closer to each other.

Hence, the correct answer is Option B.

Faster through steel than through air, B.

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Charged objects have a _________ charge. A. net B. moving C. positive D. negative

What is Alzheimer's disease?a. a group of defects that occur as a result of the mother ingesting alcohol during pregnancy b. disorder that rapidly kills brain cells and causes dementia c. fear of being away from the primary caregiver d. when a child believes that nothing exists outside him/herself, and s/he is incapable of understanding someone else's position

A hot air balloon is moving vertically upwards at a velocity of 3m/s. A sandbag is dropped when the balloon reaches 150m. How long does the sandbag take to reach the ground and what is the maximum height it reaches?