PHYSICS HIGH SCHOOL

A light-year is a unit of
a. time.
c. mass.
b. distance.
d. density.

Answers

Answer 1
Answer:

Answer: The correct answer is Option b. Distance.

Explanation:

Scientists and astronomers use this unit to measure the distance in space. A light year is a unit of distance and not time because light travels very fast and it travels a lot of distance in one year.

Light year is basically defined as how far the beam of light travels in a year.

Therefore, this light year is a unit of distance. Hence, the correct option is option b.

Answer 2
Answer: Unit of distance. B.

Light year is the distance traveled by light in one year.

Related Questions

COLLEGE

If 3.0 × 10^15 electrons flow through a section of a wire of diameter 2.0 mm in 4.0 s, what is the current in the wire? (e = 1.60 × 10^-19 c)

Answers

The current through the wire is of 0.00012 amperes.

How to find the current?

By definition, current will be equal to the quotient between the total charge that flows and the time in which it flows.

Here we have 3.0*10^15 electrons, each one with charge:

e = 1.6*10^(-19) C

Then the total charge that we have is:

Q = (1.6*10^(-19) C)*(3.0*10^15) = 0.00048 C

Finally, the current is:

I = Q/T

where:

  • Q = 0.00048 C
  • T = 4.0 s

I = (0.00048 C)/(4s) = 0.00012 A

If you want to learn more about current, you can read:

brainly.com/question/14010194

Using the given relationship between electrons and coulombs;

1 e = 1.60*10^-19 C

Total charge = 3.0*10^15*1.6*10^-19 = 4.8*10^-4 C

Current = Coulombs/Time = (4.8*10^-4)/4 = 1.2*10^-4 C/s = 1.2*10^-4 Amps

Current in amperes, A = 0.00012 A = 0.12 mA
HIGH SCHOOL

Why do polar and nonpolar molecules have different properties

Answers

Explanation:

In case of Polar molecules electron shared are unequal that's why they have an uneven distribution of charges as whereas non-polar molecules do not the distribution of charge as the electrons are shared equally that the reason they both differ from each other.

Examples of polar molecules are water, ethanol,ammonia and sulfur dioxide.

Examples of non polar molecules are oxygen,ozone,carbon dioxide,nitrogen.

HIGH SCHOOL

wo tiny spheres have the same mass and carry charges of the same magnitude. The mass of each sphere is 2.0 × 10−6 kg. The gravitational force that each sphere exerts on the other is balanced by the electric force. determine the charge magnitude.

Answers

Answer:

Charge,    

Explanation:

It is given that, two tiny spheres have the same mass and carry charges of the same magnitude. Let charge on both sphere is q.

Also, the gravitational force that each sphere exerts on the other is balanced by the electric force i.e.

Where

G is the universal gravitational constant

k is the electrostatic constant

So, the charge on both the spheres is . Hence, this is the required solution.

Answer:

Explanation:

Given:

Mass of the tiny sphere, M = 2.0 × 10⁻⁶ kg

also masses are equal i.e M₁ = M₂

Now,

the gravitational force between the two masses M₁ and M₂ is given as:

where,

G is the gravitational force constant = 6.67 x 10⁻¹¹ m³/kg.s²

r = center to center distance between the masses

also,

Electric force between the charges is given as

where,

q₁ and q₂ are the charges and also it is given that q₁=q₂=q

k is the coulomb's law constant =  9.0 x 10⁹ N.m²/C²

since it is mentioned that

we have

or

or

HIGH SCHOOL

What will happen if you place too many washers on the end of a shaded-pole motor shaft? A. The motor will become noisy. B. The rotor will jam. C. The bearings will become too heavy. D. The shaft will loosen.

Answers

The answer is letter b, the rotor will jam. It is because if there are too many washers, it will be overcrowded, making the rotor to jam in it, where this will lead the motor to dysfunction or not function properly. It is best not to place too many washers in the end of the shaded pole motor shaft to prevent further complications.
B. is the right answer
COLLEGE

The first car has twice the mass of a second car, but only half as much kinetic energy. When both cars increase their speed by 9.0 m/s, they then have the same kinetic energy. What were the original speeds of the two cars? Express your answers using two significant figures separated by a comma?

Answers

Answer:

Speed of the car 1 =

Speed of the car 2 =

Explanation:

Given:

Mass of the car 1 , M₁ = Twice the mass of car 2(M₂)

mathematically,

M₁ = 2M₂

Kinetic Energy of the car 1 = Half the kinetic energy of the car 2

KE₁ = 0.5 KE₂

Now, the kinetic energy for a body is given as

where,

m = mass of the body

v = velocity of the body

thus,

or

or

or

or

or

 .................(1)

also,

or

or

or

or

or

or

or

or

and, from equation (1)

Hence,

Speed of car 1 =

Speed of car 2 =

Answer:

The original speeds of the two cars were :

Explanation:

Let's start reading the question and making our equations in order to find the speeds.

The first equation is :

(I)

The kinectic energy can be calculated using the following equation :

(II)

Where ''K'' is the kinetic energy

Where ''m'' is the mass and where ''v'' is the speed.

By reading the exercise we find that :  

(III)

If we use (II) in (III) :

(IV)

If we replace (I) in (IV) ⇒

(V)

'' When both cars increase their speed by , they then have the same kinetic energy ''

The last equation is :

(VI)

If we use (I) in (VI) ⇒

If we use (V) in this last expression ⇒

We find that the original speed is

If we replace this value in the equation (V) ⇒

HIGH SCHOOL

The space between your car and your visual target is known as the __________ .

Answers

The space among the car and visual target is known as the Path of travel or also known as (POT). By considering the visual activity within the path of travel, it can develop a clear picture of the situation on the road ahead and anticipate the maneuvers that is to perform. For instance, if there is an intersection along the path of way, it is anticipated to take slow and watch for traffic.

MIDDLE SCHOOL

A windmill is example of a 
a.generator 
b.resistor 
c.insulator
d.motor

Answers

The answer is a. generator!
HIGH SCHOOL

The water mass having both high salinity and warm temperature and found at about 1,000 meters water depth in the central north Atlantic has been formed

Answers

Answer:

In the Mediterranean sea

Explanation:

The water present in the deeper part of the North Atlantic ocean is warm and comprised of high salinity, and abundance in oxygen as well as rich in terms of nutrient ones. On the other hand, the opposite occurs in the southern part of the Atlantic ocean. This warm water is typically found up to a depth of about 1000 meters below the mean sea level.

This Atlantic ocean is directly connected to the Mediterranean sea through the Gibraltar Strait.

Therefore, this mass of water that is comprised of higher salinity and higher temperature that is found at a depth of 1000 meters in the northern part of the Atlantic ocean has been formed in the Mediterranean sea.

COLLEGE

According to Coulomb’s Law which of the following statements are correct? Select all that apply. The force between two charged objects increases as the charge of either one of the objects is increased.
The force between two charged objects decreases as the charge of either one of the objects increases.
The force between two charged objects increases as the objects are pulled further apart.
The force between two charged objects increases as the objects are placed closer together.
Two objects that are negatively charged will always produce greater forces than two objects that are positively charged.

Answers

The correct options are:
1) The force between two charged objects increases as the charge of either one of the objects is increased. 
4) The force between two charged objects increases as the objects are placed closer together. 

In fact, the electrostatic force is given by Coulomb's law:

where k is the Coulomb's constant, q1 and q2 are the two charges, r is the separation between the two charges. As we can see from the equation, if one of the charges (q1 or q2) is increased, than the force increases as well (so statement 1) is correct), and if the two objects are placed closer together (r is decreased), the force F increases as well (so statement 4 is correct as well)
The force between two charged objects increases as the charge of either one of the object is increased


the force between two charged objects increases as the object are placed closer together

is the right answer



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