PHYSICS HIGH SCHOOL

Special relativity questions?1.) A rocket is moving at 1/4 the speed of light relative to Earth. At the center of this rocket, a light suddenly flashes. To an observer at rest on Earth
a. the light will reach the front of the rocket after it reaches the back of the rocket.
b. the light will reach the front of the rocket at the same instant that it reaches the back of the rocket.
c. the light will reach the front of the rocket before it reaches the back of the rocket. 2.) A rocket is moving at 1/4 the speed of light relative to Earth. At the center of this rocket, a light suddenly flashes. To an observer at rest in the rocket
a. the light will reach the front of the rocket before it reaches the back of the rocket.
b. the light will reach the front of the rocket at the same instant that it reaches the back of the rocket.
c. the light will reach the front of the rocket after it reaches the back of the rocket. 3.) An astronaut in an inertial reference frame measures a time interval Δt between her heartbeats. What will observers in all other inertial reference frames measure for the time interval between her heartbeats?
a. Δt
b. less than Δt
c. more thanΔt
d. The answer depends on whether they are moving toward her or away from her. 4.) You are a passenger on a spaceship. As the speed of the spaceship increases, you would observe that
a. the length of your spaceship is getting shorter.
b. the length of your spaceship is not changing.
c. the length of your spaceship is getting longer. 5.) A star is moving towards the earth with a speed at 90% the speed of light. It emits light, which moves away from the star at the speed of light. Relative to us on earth, what is the speed of the light moving toward us from the star?
a. 0.90c
b. 1.9c
c. 1.20c
d. 1.1c e,) c

Answers

Answer 1
Answer: The right answer for the question that is being asked and shown above is that:
(1) b. the light will reach the front of the rocket at the same instant that it reaches the back of the rocket.
(2) a. the light will reach the front of the rocket before it reaches the back of the rocket.
(3) b. less than Δt
(4) c. the length of your spaceship is getting longer.
(5) c. 1.20c

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A hybrid car can travel 40 miles per gallon. Approximately how many gallons of fuel will the car need to travel 20 km?A. 0.3
B. 0.8
C. 2.5
D. 3.2

Answers

Answer:

correct option is A

20 km we need 0.3 gallon fuel

Explanation:

given data

gallon = 40 miles

distance = 20 km

to find out

how many gallons of fuel

solution

we know that 20 km = 12.4274 miles

and

we know here car is travel 40 miles per gallon

it mean here that

40 miles = 1 gallon

1 miles = 1/ 40 gallon

and

12.4274 miles = 1/40 × 12.4274 gallon

solve it to get gallon of 20 km or

12.4274 miles = 0.31 gallon

so in  20 km we need 0.3 gallon fuel

correct option is A

Answer:

The number of gallons are 0.3.

A is correct option.

Explanation:

Given that,

A hybrid car can travel 40 miles per gallon

We need to calculate the mile/gallon to km/gallon

Gallon is the unit of liquid and miles and kilometer are the unit of distance.

40\ miles/gallon = 64.3738\ km/gallon

We need to calculate the number of gallons of fuel

Number of gallon N=(20)/(64.3738)

N=0.3

Hence, The number of gallons are 0.3.

In a series circuit, as more batteries are added what effect does it have on the bulbs in a circuit . Will the bulbs get brighter or stay the same?

Answers

If the batteries are in series too, then the more batteries,
the more voltage across the light bulbs, and the brighter
they will all burn. 

(Until you add the battery that causes the weakest bulb
to burn out.  Then they ALL go out.)

Match these terms with the correct examples.1. liquid solution
2. gaseous solution
3. compound
4. colloid
5. element
a. oceans
b. clouds
c. oxygen
d. air
e. water

Answers

Answer:

           1) Liquid solution: Oceans

            2) Gaseous Solution: Air

            3) Compound:  Water

            4) Colloid: Cloud

            5) Element: Oxygen

Explanation:

                        Solutions are those mixtures which have uniform composition. The size of solute is around 1 Angstrom hence, the particles of solutes can not be seen and the interactions make the overall solution transparent.

                        Compounds are those substances which are formed chemically by the reaction of two different elements like,

                                       O₂  +  2 H₂    →    2 H₂O

                        Colloids are also mixtures but these are intermediate between true solutions and suspensions. Also, the solute size is greater than that of solute size in solutions and is about 10 Angstrom. Examples include Clouds, Fog, Moist, Aerosol sprays e.t.c.

                        Elements are those substances which either are made up of single atoms like noble gases or are molecules made up of same elements like O₂, H₂, Cl₂, N₂ e.t.c.

Use other awnser this one was wrong

a car with a mass of 2000 kilograms is moving around a circular curve at a uniform velocity of 25 meters per second. The curve has a radius of 80 meters. What is the centripetal force on the car

Answers

In the given problem, we say various information's that are going to help us reach the ultimate answer to the question. Let us first write the information's that have been presented in front of us.
Mass of the car = 2000 kg
Velocity of the car = 25 m/s^2
Radius of the circle = 80 m
Now we already know the equation for calculating the centripetal force and that is
Centripetal Force = [mass * (velocity)^2]/Radius
                            = [2000 * (25)^2]/80
                            = (2000 * 625)/80
                            = 1250000/80
                            = 15625
So the centripetal force on the car is 15625 Newtons
  

your answer is 15,625 N

i just took the test

Which of these diagrams best represents the steps in the formation of planets? A) The sun is born > The clouds rotate at high speed > The clouds flatten into an elliptical disc > The planets are born
B) The clouds flatten into a disc > The sun is born > The clouds condense > the planets are born
C) The clouds of dust and gases rotate at high speed > The clouds condense > The sun is born > The planets are born
D) The clouds of gases condense > The clouds rotate at high speed > The clouds flatten into an elliptical disc > The planets are born

Answers

Answer:

D) The clouds of gases condense > The clouds rotate at high speed > The clouds flatten into an elliptical disc > The planets are born

Explanation:

Planets are formed from Planetary nebula. The cloud of dust and gases condenses under its own weight. The condensed matter starts rotating at high speeds and gathers more mass. The core forms the star and rest of it eventually flattens into an elliptical disc from which planet is born. Thus, the correct sequence is: D) The clouds of gases condense > The clouds rotate at high speed > The clouds flatten into an elliptical disc > The planets are born.
The right answer for the question that is being asked and shown above is that: "C) The clouds of dust and gases rotate at high speed > The clouds condense > The sun is born > The planets are born " This is the diagram that best represents the steps in the formation of planets

A projectile was launched horizontally with a velocity of 468 m/s, 1.86 m above the ground. Calculate how long it would take for the projectile to hit the ground, to the nearest tenth of a second. Record your answer in the boxes below. Be sure to use the correct place value.

Answers

Answer:

  0.6 seconds

Explanation:

The time to fall from height h is ...

  t = √(2h/g)

  t = √(2(1.86 m)/(9.8 m/s^2)) ≈ √0.3796 s ≈ 0.616 s

It would take about 0.6 seconds for the projectile to hit the ground.

Answer:

0.6seconds

isuranswer:)

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