Which concept of special relativity is best understood by the thought experiment of a light clock

Answer this:

Which concept of special relativity is best understood by the thought experiment of a light clock?

Select one:

A. IMPOSSIBILITY OF SUPERLUMINAL MOTION

B. LENGTH CONTRACTION ALONG THE DIRECTION OF MOTION

C. TIME DILATION IN A MOVING FRAME OF REFERENCE

D. EQUIVALENCE OF INERTIAL FRAMES OF REFERENCE

Halfway through his trip Antoine realized he forgot some things and had to radio back to Earth with additional shipping requests. How long does it take that message to reach Earth?

Select one:

A. NEAR INSTANTLY

B. AROUND 2.3 YEARS

C. ABOUT 3.5 YEARS

D. ABOUT 7 YEARS

Antoine is a molecular exo-biologist on his way to a planet orbiting a star that is exactly 7 light years away from Earth to begin studying the suitability of the planet to support human life. He is eager to begin work as he says goodbye to his family and boards the spaceship for the long journey ahead…

After Antoine arrives at his destination he is anxious to get started but needs the additional supplies he ordered half way through his voyage before he can begin. What is the earliest he can expect the additional supplies to arrive?

Select one:

A. ABOUT 2.3 YEARS

B. MORE THAN 10 YEARS

C. 3 MILLION YEARS

D. FROM HIS POINT OF VIEW THE SUPPLIES WILL NEVER ARRIVE

Parker and Stan perform a simple experiment timing how long it takes a ball to drop while riding on a roller coaster and notice different results than when they perform the same experiments in the lab. What is the likely reason?

Select one:

A. ON THE ROLLER COASTER THEY DON’T HAVE AS GOOD EQUIPMENT AS IN THE LAB.

B. ON THE ROLLER COASTER THEY ARE UNDERGOING ACCELERATION AND NON-UNIFORM MOTION WITH RESPECT TO THE LAB.

C. THE ACCELERATION DUE TO GRAVITY ON THE ROLLER COASTER IS DIFFERENT THAN THE GRAVITY IN THE LAB.

D. ON THE ROLLER COASTER THEY HAVE TO DEAL WITH WIND RESISTANCE WHICH IS NOT A FACTOR IN THE LAB.

What of the following are challenges to deep space exploration at high velocity caused by relativistic considerations?

Select one:

A. STARS ARE SO CLOSE TOGETHER THAT THERE IS A GREAT RISK OF COLLISION.

B. FOOD, WATER AND AIR FOR AN EXTENDED VOYAGE WOULD NEED TO BE RECYCLED.

C. TIME WOULD PASS VERY DIFFERENTLY FOR THE EXPLORERS COMPARED TO PEOPLE BACK ON EARTH.

D. RADIATION HAZARDS IN THE INTERSTELLAR MEDIUM ARE RELATIVELY UNKNOWN.

Clock A and Clock B are synchronized and then Clock B is placed on a spaceship departing Earth at 80% the speed of light while Clock A stays on Earth. When the ship returns 10 years later and the clocks are compared, what is found?

Select one:

A. CLOCK A AND CLOCK B SHOW THE EXACT SAME TIME.

B. CLOCK A SHOWS MORE TIME HAS PASSED THAN CLOCK B.

C. CLOCK B SHOWS MORE TIME HAS PASSED THAN CLOCK A.

D. NEITHER CLOCK IS CORRECT.

Dan and Dave who are identical twins. Dan left on a trip to a different solar system in the year 3172 and returned in 3197. Dave remained at home on Earth. When reunited one twin is visibly older than the other. Which twin is older and what is the most logical reason?

Select one:

A. DAN IS OLDER BECAUSE MUCH OF HIS JOURNEY WAS DONE AT SPEEDS NEAR THE SPEED OF LIGHT.

B. DAN IS OLDER BECAUSE HE EXPERIENCED TIME DILATION ON HIS JOURNEY.

C. DAVE IS OLDER BECAUSE OF DAN HAVING EXPERIENCED TIME DILATION ON HIS JOURNEY.

D. DAVE IS OLDER BECAUSE IN HIS FRAME OF REFERENCE DAN DID NOT TRAVEL AS FAR.

Jim stands at the front of a space ship moving at 90% of the speed of light and fires a laser gun forward. Jim’s ship is moving past Steve who sees the ship moving at 90% of the speed of light away from him. Steve now sees Jim turn around and fire the gun backwards. From Steve’s point of view the laser light leaving the gun moves at.

Select one:

A. 190% OF THE SPEED OF LIGHT

B. 10% OF THE SPEED OF LIGHT

C. 90% OF THE SPEED OF LIGHT

D. 100% OF THE SPEED OF LIGHT

Determine why corrections are needed for the internal clocks of GPS satellites.

Select one:

A. GPS SATELLITES MOVE AT SPEEDS THAT CAUSE ITS CLOCKS TO SLOW RELATIVE TO EARTH.

B. GPS SATELLITES BREAK DOWN OVER MANY YEARS

C. GPS RECEIVERS NEED SIGNALS FROM 4 SATELLITES TO DETERMINE A 3D LOCATION.

D. GPS SATELLITES HAVE COMPLEX ORBITS

What did Einstein’s 1905 paper titled “On the Electrodynamics of Moving Bodies” introduce?

Select one:

A. ELECTROMAGNETISM

B. NUCLEAR PHYSICS

C. GENERAL RELATIVITY

D. SPECIAL RELATIVITY

Antoine is a molecular exo-biologist on his way to a planet orbiting a star that is exactly 7 light years away from Earth to begin studying the suitability of the planet to support human life. He is eager to begin work as he says goodbye to his family and boards the spaceship for the long journey ahead.
When Antoine arrives at his destination he wants to send a message back to Earth to let everyone know he’s okay. If Antoine’s message is sent via tight-beam laser communication, how long will it take Antoine’s family to receive the message after he sends it?

Select one:

A. LESS THAN 7 YEARS

B. 7 YEARS

C. 9 YEARS

D. 14 YEARS

Gloria is in a spaceship moving with constant velocity 50% of the speed of light and detects Andy’s spaceship in the distance. What has to be true of Andy’s spaceship if Andy is in an equivalent reference frame to Gloria?

Select one:

A. ANDY’S SHIP MUST BE UNDERGOING UNIFORM ACCELERATION.

B. ANDY’S SHIP MUST HAVE A SPEED EQUAL TO OR GREATER THAN 50% OF THE SPEED OF LIGHT.

C. ANDY’S SHIP MUST BE MOVING WITH A CONSTANT VELOCITY.

D. ANDY’S SHIP MUST BE MOVING IN THE SAME DIRECTION.

Davis and Troy both see a ball thrown into the air from different vantage points. Davis sees the ball ascend straight up into the sky while Troy sees the ball move diagonally up and to the left. Which of the following is true?

Select one:

A. DAVIS IS IN THE SAME FRAME OF REFERENCE AS THE BALL.

B. TROY IS IN THE SAME FRAME OF REFERENCE AS THE BALL.

C. DAVIS AND TROY ARE IN THE SAME FRAME OF REFERENCE.

D. IT IS IMPOSSIBLE TO DETERMINE FROM THE INFORMATION PROVIDED.

Gloria is in a spaceship moving with constant velocity 50% of the speed of light and detects Andy’s spaceship in the distance. If Andy and Gloria are indeed in equivalent reference frames, which of the following must be true?

Select one:

A. THEIR CLOCKS IN BOTH REFERENCE FRAMES MOVE AT THE SAME RATE.

B. THE LENGTH OF A LADDER ALONG THE DIRECTION OF MOTION IS THE SAME.

C. PHYSICAL LAWS IN BOTH REFERENCE FRAMES ARE THE SAME.

D. A BULLET FIRED FROM THE FRONT OF EACH SHIP HAS THE SAME SPEED.

In our everyday lives how often do we encounter effects of time dilation?

Select one:

A. NEARLY CONSTANTLY WHEN LOOKING AT SPEED AND MOTIONS OF OBJECTS AROUND US

B. ALMOST NEVER AS NEARLY ALL OBJECTS AROUND US MOVE MUCH SLOWER THAN LIGHT

C. ROUGHLY HALF OF THE OBJECTS WE SEE UNDERGO SOME SIGNIFICANT TIME DILATION.

D. WE NEVER ENCOUNTER TIME DILATION EFFECTS; IT IS ALL JUST THEORETICAL PHYSICS.

Clock A and Clock B are synchronized and then Clock B is placed on a spaceship departing Earth at 80% the speed of light while Clock A stays on Earth. Of the two clocks which clock shows the correct time?

Select one:

A. BOTH CLOCK A AND CLOCK B ARE CORRECT.

B. CLOCK A IS CORRECT AND CLOCK B IS WRONG.

C. CLOCK B IS CORRECT AND CLOCK A IS WRONG.

D. NEITHER CLOCK IS CORRECT.

Jim stands at the front of a space ship moving at 90% of the speed of light and fires a laser gun forward. Jim’s ship is moving past Steve who sees the ship moving at 90% of the speed of light away from him. From Jim’s point of view the laser light leaving the gun moves at:

Select one:

A. 109% OF THE SPEED OF LIGHT

B. 10% OF THE SPEED OF LIGHT

C. 90% OF THE SPEED OF LIGHT

D. 100% OF THE SPEED OF LIGHT

Jim stands at the front of a space ship moving at 90% of the speed of light and fires a laser gun forward. Jim’s ship is moving past Steve who sees the ship moving at 90% of the speed of light away from him. From Steve’s point of view the laser light leaving the gun moves at:

Select one:

A. 190% OF THE SPEED OF LIGHT

B. 10% OF THE SPEED OF LIGHT

C. 90% OF THE SPEED OF LIGHT

D. 100% OF THE SPEED OF LIGHT

Dan and Dave who are identical twins. Dan left on a trip to a different solar system in the year 3172 and returned in 3197. Dave remained at home on Earth. Dan and Dave compare notes on how far Dan travelled. Dan’s notes are from his reference frame and Dave’s notes are based on keeping track of his brother’s journey from Earth. If Dan believes he travelled around 3 light years how far does Dave think his twin has travelled?

Select one:

A. DAVE THINKS DAN TRAVELLED FEWER THAN 3 LIGHT YEARS.

B. DAVE THINKS DAN TRAVELLED AROUND 3 LIGHT YEARS.

C. DAVE THINKS DAN TRAVELLED MUCH FURTHER THAN 3 LIGHT YEARS.

Antoine is a molecular exo-biologist on his way to a planet orbiting a star that is exactly 7 light years away from Earth to begin studying the suitability of the planet to support human life. He is eager to begin work as he says goodbye to his family and boards the spaceship for the long journey ahead.
Antoine is expecting additional supplies after he arrives at his destination. If his supplies were shipped out 3 months after he left Earth how long will he have to wait before his supplies arrive? Assume the ship his supplies are on has the same cruising speed as Antoine’s own vessel.

Select one:

A. ANTOINE HAS TO WAIT 3 MONTHS FOR HIS SUPPLIES.

B. ANTOINE WILL HAVE TO WAIT 6 MONTHS FOR HIS SUPPLIES.

C. ANTOINE WILL HAVE TO WAIT MORE THAN A YEAR FOR HIS SUPPLIES.

D. ANTOINE DOESN’T HAVE TO WAIT; HIS SUPPLIES ARRIVED BEFORE HE DID.

What portion of a routine airplane flight can be considered a nonaccelerating frame of reference?

Select one:

A. TAKE-OFF FROM AN AIRPORT

B. LANDING AT AN AIRPORT

C. TURBULENCE DURING MIDFLIGHT

D. CRUISING AT A FIXED ALTITUDE

Antoine is a molecular exo-biologist on his way to a planet orbiting a star that is exactly 7 light years away from Earth to begin studying the suitability of the planet to support human life. He is eager to begin work as he says goodbye to his family and boards the spaceship for the long journey ahead…
If Antoine’s ship has a cruising speed of 80% the speed of light which of the following is true about Antoine’s trip to the star?

Select one:

A. ANTOINE WILL HAVE AGED MORE THAN 7 YEARS BY THE TIME HE ARRIVES.

B. ANTOINE WILL HAVE AGED EXACTLY 7 YEARS BY THE TIME HE ARRIVES.

C. ANTOINE WILL HAVE AGED LESS THAN 7 YEARS BY THE TIME HE ARRIVES.

D. ANTOINE’S TRIP REQUIRES NO SPECIAL RELATIVITY CONSIDERATIONS.

Dan and Dave who are identical twins. Dan left on a trip to a different solar system in the year 3172 and returned in 3197. Dave remained at home on Earth. If Dan and Dave no longer appear to be the same age then which twin is the correct age?

Select one:

A. BOTH DAN AND DAVE ARE BOTH CORRECT FROM THEIR OWN POINT OF VIEW EVEN IF THEY NO LONGER AGREE.

B. DAVE’S IS THE CORRECT AGE, DAN IS WRONG BECAUSE HE WAS MOVING AT RELATIVISTIC SPEEDS.

C. DAN’S IS THE CORRECT AGE, DAVE IS WRONG BECAUSE HE WAS MOVING AT RELATIVISTIC SPEEDS.

D. NEITHER DAN NOR DAVE IS CORRECT, THEIR REAL AGE IS SOMEWHERE BETWEEN THE TWO.

Why would making a phone call to future explorers or colonists on the planet Mars be difficult?

Select one:

A. MARS IS MOVING VERY RAPIDLY WITH RESPECT TO THE EARTH’S FRAME OF REST.

B. MARS IS IN A DIFFERENT ORBIT AROUND THE SUN THAN THE EARTH.

C. MARS’ ROTATION WOULD NECESSITATE SIGNAL CORRECTIONS FOR ITS FRAME OF REFERENCE.

D. MARS IS FAR AWAY. THERE WOULD BE LAG IN THE TIME LIGHT TAKES TO GET THERE.

Antoine is a molecular exo-biologist on his way to a planet orbiting a star that is exactly 7 light years away from Earth to begin studying the suitability of the planet to support human life. He is eager to begin work as he says goodbye to his family and boards the spaceship for the long journey ahead. What can we say about the distance Antoine traveled in his rest frame?

Select one:

A. THE DISTANCE HE TRAVELED IS LESS THAN 7 LIGHT YEARS.

B. THE DISTANCE HE TRAVELED IS 7 LIGHT YEARS.

C. THE DISTANCE HE TRAVELED IS MORE THAN 7 LIGHT YEARS.

D. THERE IS NOT ENOUGH INFORMATION TO DETERMINE.

 

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