Physics

The post-Newtonian age began in 1900 when

The post-Newtonian age began in 1900 when

The post-Newtonian age began in 1900 when
A) Maxwell introduced electromagnetic waves.
B) Einstein introduced the general theory of relativity.
C) Einstein introduced the special theory of relativity.
D) Michelson declared the

einsteindude   332   1 Reply

mel!811

During his public school and university days, Einstein could best be described a

During his public school and university days, Einstein could best be described a

During his public school and university days, Einstein could best be described as
A) a mediocre but hardworking student.
B) a good but not outstanding student.
C) an excellent and hardworking student.
D) a child prodigy who at

einsteindude   332   1 Reply

mel!811

The two major physical theories of the 20th century are

The two major physical theories of the 20th century are

The two major physical theories of the 20th century are
A) electromagnetic theory and the theory of gravity.
B) quantum theory and the theory of relativity.
C) the theory of relativity and electromagnetic theory.
D) electromag

einsteindude   1228   1 Reply

mel!811

The two great theories of 20th-century physics are

The two great theories of 20th-century physics are

The two great theories of 20th-century physics are
A) thermodynamics and electromagnetism.
B) the theory of relativity and quantum theory.
C) quantum theory and electromagnetism.
D) high energy physics and the theory of relati

einsteindude   283   1 Reply

mel!811

Velma is in a train moving north at 20 m/s. She throws a stone toward the rear o

Velma is in a train moving north at 20 m/s. She throws a stone toward the rear o

Velma is in a train moving north at 20 m/s. She throws a stone toward the rear of the train, at 5 m/s relative to herself. Mort, standing beside the tracks, sees the stone move
A) north at 15 m/s.
B) north at 25 m/s.
C) north at 20

einsteindude   194   1 Reply

mel!811

Velma, inside a train moving at 20 m/s, throws a rock in the forward direction a

Velma, inside a train moving at 20 m/s, throws a rock in the forward direction a

Velma, inside a train moving at 20 m/s, throws a rock in the forward direction at 5 m/s. According to her the rock moves at 5 m/s. According to Mort, standing on Earth outside the train, the rock moves at [approximately] 25 m/s. Who is correct?

einsteindude   234   1 Reply

mel!811

Velma is in a train headed north past Mort at 30 m/s. Velma has a slingshot that

Velma is in a train headed north past Mort at 30 m/s. Velma has a slingshot that

Velma is in a train headed north past Mort at 30 m/s. Velma has a slingshot that can shoot pebbles at 40 m/s. Velma shoots a pebble toward the rear of the train. Velma observes the pebble's velocity to be
A) 70 m/s north.     

einsteindude   258   1 Reply

mel!811

Velma is in a train headed north past Mort at 30 m/s. Velma has a slingshot that

Velma is in a train headed north past Mort at 30 m/s. Velma has a slingshot that

Velma is in a train headed north past Mort at 30 m/s. Velma has a slingshot that can shoot pebbles at 40 m/s. Velma shoots a pebble toward the rear of the train. Mort observes the pebble's velocity to be
A) 10 m/s north.     

einsteindude   231   1 Reply

mel!811

Velma is in a train moving eastward at 20 m/s. She throws a ball toward the rear

Velma is in a train moving eastward at 20 m/s. She throws a ball toward the rear

Velma is in a train moving eastward at 20 m/s. She throws a ball toward the rear of the train, throwing it at her normal "throwing speed" of 20 m/s. What is Mort's observation, regarding the ball?
A) It moves westward at 20 m/s.

einsteindude   302   1 Reply

mel!811

Mort, who is standing on the ground, throws a ball at 20 m/s eastward as measure

Mort, who is standing on the ground, throws a ball at 20 m/s eastward as measure

Mort, who is standing on the ground, throws a ball at 20 m/s eastward as measured by him. What is the ball's velocity relative to Velma, who is in a train moving eastward past Mort at 70 m/s?
A) 90 m/s eastward
B) 50 m/s westward

einsteindude   254   1 Reply

mel!811

Velma bicycles northward at an unchanging speed of 4 m/s, and Mort jogs southwar

Velma bicycles northward at an unchanging speed of 4 m/s, and Mort jogs southwar

Velma bicycles northward at an unchanging speed of 4 m/s, and Mort jogs southward at an unchanging speed of 4 m/s. Are Velma and Mort in relative motion?
A) No, because they both have the same speed.
B) No, because they both have the same

einsteindude   236   1 Reply

mel!811

Velma bicycles northward at an unchanging speed of 4 m/s, and Mort jogs southwar

Velma bicycles northward at an unchanging speed of 4 m/s, and Mort jogs southwar

Velma bicycles northward at an unchanging speed of 4 m/s, and Mort jogs southward at an unchanging speed of 4 m/s. Mort's velocity relative to Velma is
A) 8 m/s northward.
B) 4 m/s northward.
C) 8 m/s southward.
D) zero.

einsteindude   208   1 Reply

mel!811

You are inside a jet plane moving at a constant velocity. You toss a rock straig

You are inside a jet plane moving at a constant velocity. You toss a rock straig

You are inside a jet plane moving at a constant velocity. You toss a rock straight up in the air, and then you keep your hand at the point of release. The rock will come down
A) in front of your hand.
B) behind your hand.
C) beside y

einsteindude   253   1 Reply

mel!811

You are a passenger in a moving car, and you drop a coin from your right hand, h

You are a passenger in a moving car, and you drop a coin from your right hand, h

You are a passenger in a moving car, and you drop a coin from your right hand, holding your left hand directly below the point of release. If the car is moving at unchanging velocity, the coin will come down
A) in your left hand.    &

einsteindude   238   1 Reply

mel!811

"Unless you look outside, you cannot tell how fast you are going." This is one w

"Unless you look outside, you cannot tell how fast you are going." This is one w

"Unless you look outside, you cannot tell how fast you are going." This is one way of stating
A) the principle of relativity.
B) Galileo's theory of relativity.
C) the relativity of time.
D) the principle of the

einsteindude   192   1 Reply

mel!811

Suppose that you are inside a smooth-flying [no bumps] jet plane that is speedin

Suppose that you are inside a smooth-flying [no bumps] jet plane that is speedin

Suppose that you are inside a smooth-flying [no bumps] jet plane that is speeding up along a straight line. Can you detect this acceleration without directly or indirectly making use of anything outside of your own reference frame? If so, how could y

einsteindude   271   1 Reply

mel!811

Suppose you are inside a smooth-flying [no bumps] jet plane moving at constant s

Suppose you are inside a smooth-flying [no bumps] jet plane moving at constant s

Suppose you are inside a smooth-flying [no bumps] jet plane moving at constant speed in a straight line across the Atlantic Ocean. Can you detect this motion [i.e., can you tell that you are moving] without directly or indirectly making use of anythi

einsteindude   423   1 Reply

mel!811

According to the principle of relativity, an observer who has no communication w

According to the principle of relativity, an observer who has no communication w

According to the principle of relativity, an observer who has no communication with the world outside of her laboratory will be unable to detect
A) her laboratory's acceleration.
B) her laboratory's velocity.
C) Both of th

einsteindude   322   1 Reply

mel!811

Einstein proposed two basic principles or laws as the foundation of his special

Einstein proposed two basic principles or laws as the foundation of his special

Einstein proposed two basic principles or laws as the foundation of his special theory of relativity. One of these principles is intuitively plausible, while the other seems quite implausible or odd to our intuitions. The principle that is intuitivel

einsteindude   262   1 Reply

mel!811

If you drop a coin inside a car that is slowing down, the coin will land

If you drop a coin inside a car that is slowing down, the coin will land

If you drop a coin inside a car that is slowing down, the coin will land
A) in St. Louis.
B) to the side of the drop point.
C) right under the drop point.
D) in front of the drop point.
E) to the rear of the drop point.

einsteindude   509   1 Reply

mel!811

If you drop a coin inside a car that is turning a corner to the right, the coin

If you drop a coin inside a car that is turning a corner to the right, the coin

If you drop a coin inside a car that is turning a corner to the right, the coin will land
A) right under the drop point.
B) to the left of the drop point.
C) to the right of the drop point.
D) to the rear of the drop point.

einsteindude   319   1 Reply

mel!811

One way of stating the principle of relativity is:

One way of stating the principle of relativity is:

One way of stating the principle of relativity is:
A) Observers that are accelerated will see light beams move at something other than lightspeed.
B) Light has the same speed for all nonaccelerated observers.
C) Unless you look outs

einsteindude   369   1 Reply

mel!811

Mort stands on Earth. Velma moves away from him in a rocket, at 299,000 km/s (10

Mort stands on Earth. Velma moves away from him in a rocket, at 299,000 km/s (10

Mort stands on Earth. Velma moves away from him in a rocket, at 299,000 km/s (1000 km/s slower than lightspeed). Mort sends a laser beam toward Velma. As the tip of the beam passes her rocket, Velma observes that
A) the laser beam moves past he

einsteindude   231   1 Reply

mel!811

In Einstein's special theory of relativity, there is one basic principle [or ass

In Einstein's special theory of relativity, there is one basic principle [or ass

In Einstein's special theory of relativity, there is one basic principle [or assumption, or law] that seems very odd to our intuitions, and that is responsible for the odd nature of Einstein's conclusions. This basic principle is
A) t

einsteindude   459   1 Reply

mel!811

Velma's rocket ship is moving away from Mort at a speed of 0.75c. Mort fires a l

Velma's rocket ship is moving away from Mort at a speed of 0.75c. Mort fires a l

Velma's rocket ship is moving away from Mort at a speed of 0.75c. Mort fires a laser beam toward her spaceship, observing the tip of the laser beam to move away from him at speed c. According to the predictions of Galileo's relativity, Velm

einsteindude   379   1 Reply

mel!811

Velma's rocket ship is moving away from Mort at a speed of 0.75c. Mort fires a l

Velma's rocket ship is moving away from Mort at a speed of 0.75c. Mort fires a l

Velma's rocket ship is moving away from Mort at a speed of 0.75c. Mort fires a laser beam toward her spaceship, observing the tip of the laser beam to move away from him at speed c. Velma observes this laser beam to move past her at a speed of

einsteindude   300   1 Reply

mel!811

Before Einstein, scientists thought that the substance that was "waving" when a

Before Einstein, scientists thought that the substance that was "waving" when a

Before Einstein, scientists thought that the substance that was "waving" when a light wave was transmitted was
A) ether.
B) phlogisten.
C) plasma.
D) air.
E) They didn't think any material substance was wa

einsteindude   424   1 Reply

mel!811

Since Einstein, scientists think that the substance that is "waving" when a ligh

Since Einstein, scientists think that the substance that is "waving" when a ligh

Since Einstein, scientists think that the substance that is "waving" when a light wave is transmitted is
A) ether.
B) air.
C) phlogisten.
D) plasma.
E) They don't think any material substance is waving.

einsteindude   511   1 Reply

mel!811

Einstein's principle of the constancy of lightspeed and principle of relativity

Einstein's principle of the constancy of lightspeed and principle of relativity

Einstein's principle of the constancy of lightspeed and principle of relativity are
A) assumptions which cannot be proven.
B) the basic principles of his theory of relativity.
C) Both of the above.
D) Neither of the above

einsteindude   492   1 Reply

mel!811

How many valence electrons does bromine (Br, atomic no. = 35) have?

How many valence electrons does bromine (Br, atomic no. = 35) have?

How many valence electrons does bromine (Br, atomic no. = 35) have?
A) 1
B) 7
C) 21
D) 28
E) 35

einsteindude   414   1 Reply

assou2

In the "special theory of relativity," what does the word "special" refer to? A

In the "special theory of relativity," what does the word "special" refer to? A

In the "special theory of relativity," what does the word "special" refer to?
A) This theory is restricted to the study of gravitational forces.
B) This theory is restricted to the observations of accelerated observers

einsteindude   302   1 Reply

mel!811

The basic difference between the special and general theories of relativity is t

The basic difference between the special and general theories of relativity is t

The basic difference between the special and general theories of relativity is that
A) the first deals with electricity and the second with magnetism.
B) the first assumes that the observers are at rest and the second allows the observers

einsteindude   169   1 Reply

mel!811

Einstein believed that the principle of relativity should apply to Maxwell's the

Einstein believed that the principle of relativity should apply to Maxwell's the

Einstein believed that the principle of relativity should apply to Maxwell's theory of electromagnetism. Which basic principle or law did this lead Einstein to propose?
A) length contraction
B) the law of inertia
C) the relativit

einsteindude   231   1 Reply

mel!811

The 1964 experiment that checked the validity of the principle of the constancy

The 1964 experiment that checked the validity of the principle of the constancy

The 1964 experiment that checked the validity of the principle of the constancy of lightspeed involved
A) a NASA satellite that emitted radiation both forward and backward.
B) the emission of light from two atoms that were at rest on Eart

einsteindude   141   1 Reply

mel!811

Mort observes Velma's light-clock, as Velma passes. Mort thus observes Velma's c

Mort observes Velma's light-clock, as Velma passes. Mort thus observes Velma's c

Mort observes Velma's light-clock, as Velma passes. Mort thus observes Velma's clock to be
A) fast.
B) stopped.
C) slow.
D) on time.
E) moving backward in time.

einsteindude   239   1 Reply

mel!811

Velma and Mort pass each other, in rocket ships, at a relative velocity of half

Velma and Mort pass each other, in rocket ships, at a relative velocity of half

Velma and Mort pass each other, in rocket ships, at a relative velocity of half of lightspeed. Velma has an ice cream cone which will melt in 5 minutes if not refrigerated. She removes her cone from the refrigerator, and allows it to melt. According

einsteindude   244   1 Reply

mel!811

Velma passes Mort at a high speed. Velma and Mort each have identical light-cloc

Velma passes Mort at a high speed. Velma and Mort each have identical light-cloc

Velma passes Mort at a high speed. Velma and Mort each have identical light-clocks. Mort and Velma both observe both clocks to "tick" simultaneously at 12 noon on both clocks. Mort observes that Velma's next tick occurs
A) at the

einsteindude   270   1 Reply

mel!811

Velma passes Mort at a high speed. Velma and Mort each have identical light-cloc

Velma passes Mort at a high speed. Velma and Mort each have identical light-cloc

Velma passes Mort at a high speed. Velma and Mort each have identical light-clocks. Mort and Velma both observe both clocks to "tick" simultaneously at 12 noon on both clocks. Velma observes that Mort's next tick occurs
A) at the

einsteindude   217   1 Reply

mel!811

Velma zooms past Mort at half of lightspeed. Mort observes Velma's clock. He obs

Velma zooms past Mort at half of lightspeed. Mort observes Velma's clock. He obs

Velma zooms past Mort at half of lightspeed. Mort observes Velma's clock. He observes that her clock runs
A) slow.       B) on time.       C) fast.       D) None of the above.

einsteindude   259   1 Reply

mel!811

Velma zooms past Mort at half of lightspeed. Velma observes Mort's clock to run

Velma zooms past Mort at half of lightspeed. Velma observes Mort's clock to run

Velma zooms past Mort at half of lightspeed. Velma observes Mort's clock to run
A) slow.       B) on time.       C) fast.       D) None of the above.

einsteindude   214   1 Reply

mel!811