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General and Special Relativity

Relativity is the theory stating that all measurements depend on the relative motions of the observer and the observed. The theories of general and specific relativity were both proposed by Albert Einstein.

500 Questions

Would a 10g piece of aluminum and 10g piece of iron have the same volume?

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Asked by Wiki User

No, the 10g piece of aluminum and 10g piece of iron would not have the same volume. Different materials have different densities, so even if they have the same mass, their volumes will be different.

If you leave Earth traveling at the speed of light in a circular pattern and your twin stays on Earth observing you when you eventually reach your twin who will be older?

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Asked by Wiki User

According to the theory of relativity, time dilation occurs as an object's velocity approaches the speed of light. As a result, time will appear to pass slower for you as you travel near the speed of light compared to your twin who remains on Earth. Therefore, when you eventually reach your twin, they would be older than you.

What happens to the invariant quantities in special relativity?

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Asked by Wiki User

In special relativity, the invariant quantities, such as the speed of light and the spacetime interval, remain the same for all observers. This means that these quantities do not change regardless of the relative motion between observers. It is a fundamental principle of special relativity that these invariants are preserved in all inertial reference frames.

What is the mass of a photon in motion?

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Asked by Sankethspacetime

A photon is a massless particle, meaning it has no rest mass. Its mass is zero, but it does have energy and momentum.

How does twin paradox affects human metabolism?

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Asked by Wiki User

The twin paradox is a thought experiment in special relativity that involves one twin traveling at high speeds and the other twin staying on Earth. The twin who travels at high speeds will age more slowly relative to the twin who stays on Earth. However, this does not directly affect human metabolism as it primarily involves differences in time dilation and perception of time. Metabolism is a biological process that is influenced by a variety of factors such as diet, exercise, genetics, and overall health, rather than the effects of relative motion and time dilation.

What happens to a car's velocity when you double its velocity?

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Asked by Wiki User

If you double a car's velocity, its velocity will also double. This means that the car will be moving twice as fast as it was previously.

Can light bend around objects?

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Asked by Wiki User

Yes, light can bend around objects. This phenomenon is known as diffraction and occurs when light waves encounter an obstacle or a small opening. Diffraction causes the light waves to spread out and bend, allowing us to observe patterns such as the bending of light around the edges of a solid object or the interference patterns produced by a narrow slit.

Why don't we experience time dilation in everyday life?

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Asked by Wiki User

We do experience a form of time dilation in everyday life, but the effects are extremely small. Time dilation occurs due to differences in gravitational potential and velocities. In our daily lives, these differences are relatively insignificant compared to extreme situations, such as near a black hole or moving at speeds close to the speed of light, where the effects of time dilation become much more pronounced.

How do you know if a substance will float on water if you only know its density?

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Asked by Wiki User

If the density of a substance is less than the density of water (1 g/cm^3), then it is likely to float. If the density is greater than 1 g/cm^3, it will likely sink. However, the shape and size of the substance can also affect its buoyancy, so it's important to consider other factors as well.

Is there more force created when 2 objects meet in motion or when 1 object is still?

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Asked by Wiki User

When two objects meet in motion, there is generally more force created compared to when one object is still. This is because when both objects are in motion, they have momentum which adds to the force of the collision. When one object is still, there is only the force of the moving object acting upon the still object.

Why is light the constant in the theory of relativity?

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Asked by Wiki User

Light is considered a constant in the theory of relativity because it travels at the same speed (approximately 299,792,458 meters per second) in a vacuum regardless of the observer's motion or velocity. This constancy of the speed of light is a fundamental postulate of Einstein's theory and is central to the predictions and equations of special and general relativity. It establishes a universal frame of reference for measuring time and space.

What is the power of a laser measured in?

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Asked by Wiki User

Watts, same as light bulbs. Most pen pointer lasers are 5 mw, or 5 milliwatts (5 thousandths of a watt). Image the light of a 120 watt incandescent bulb compared to that. 120 watts vs. 0.005 watts. The light bulb consumes 24,000 times more energy, even though the laser dot is really, really bright.

How many words in the theory of relativity?

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Asked by Wiki User

The theory of relativity consists of numerous mathematical equations and concepts that describe the behavior of space, time, and gravity. It is not possible to determine the exact number of words in the theory as it is primarily expressed in mathematical notation rather than words. However, there are many books and papers written about the theory of relativity that explain the concepts in words.

What did Sadi Carnot invent?

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Asked by Wiki User

Sadi Carnot did not invent anything. He was a French engineer and physicist who formulated the principles of thermodynamics and is considered one of the founders of thermodynamic theory.

What is the importance of marketing intermediaries?

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Asked by Wiki User

Marketing intermediaries play a crucial role in connecting producers to consumers. They help in distributing products and ensuring that they reach the target market efficiently. Intermediaries also provide services such as promotion, market research, and market feedback, thereby aiding in market expansion and customer satisfaction. Overall, marketing intermediaries are vital in bridging the gap between producers and consumers, and in facilitating the smooth flow of goods and services in the marketplace.

Can light produce interference patterns?

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Asked by Wiki User

Yes, light can produce interference patterns. When a light wave passes through two closely spaced slits or obstacles, it diffracts and creates an interference pattern consisting of alternating bright and dark regions on a screen. This phenomenon is known as the interference of light and is a characteristic of wave-like behavior.

What predictions of general relativity have been verified?

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Asked by Wiki User

Several predictions of general relativity have been verified. These include the bending of light around massive objects, known as gravitational lensing, the redshift of light in a gravitational field, the time dilation experienced near massive objects like black holes, and the detection of gravitational waves, which are ripples in spacetime.

Working of a subwoofer?

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Asked by Wiki User

A subwoofer is a specialized loudspeaker designed to reproduce low-frequency sounds, typically below 100 Hz. It works by using a large driver and an enclosure that is specifically tuned for low-frequency reproduction. The subwoofer is connected to an audio system or amplifier that sends low-frequency signals to the subwoofer, which then produces deep, powerful bass tones that can enhance the overall audio experience.

Who discovered dual nature of light?

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Asked by Wiki User

The dual nature of light was discovered by Thomas Young in the early 19th century through his famous double-slit experiment. Young's experiment showed that light could behave both as a wave and as a particle, which laid the foundation for the concept of wave-particle duality in physics.

Why are the bases of cold drink tins concave It has something to do with Boyle's law?

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Asked by Wiki User

The bases of cold drink tins are concave due to Boyle's law, which states that as pressure increases, volume decreases. The concave shape allows the tin to withstand a higher internal pressure created by carbonation more effectively, preventing the can from bursting.

What happens if an object which is almost travaling at the speed of light is trapped in a garage it normally wouldn't fit in?

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Asked by Wiki User

If an object is traveling at or close to the speed of light, it cannot be trapped in a garage that it wouldn't normally fit in. This is because as an object approaches the speed of light, its length contracts in the direction of motion according to the theory of relativity. Therefore, the object will fit into the garage even though it would have seemed too large when at rest.

Why the mass of a body gets converted into energy?

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Asked by Wiki User

The mass of a body can get converted into energy according to Einstein's famous equation, E=mc^2. This equation states that energy (E) is equal to the mass (m) of an object multiplied by the square of the speed of light (c). Essentially, this means that even a small amount of mass can release a large amount of energy when it is converted through nuclear reactions or other processes.

Did Einstein get paid for discovering the General Theory of Relativity?

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Asked by Wiki User

No, Albert Einstein did not receive a direct payment for discovering the General Theory of Relativity. However, his fame and reputation earned him numerous lucrative opportunities, including academic positions and consulting fees for lectures and talks. Additionally, he was awarded the Nobel Prize in Physics in 1921, although it was not specifically for his work on general relativity.

What instrument measures the speed of an airplane?

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Asked by Wiki User

In aviation, the dial you look at to read your speed through the air is known as an IAS dial (indicated air speed). This dial is an indiaction only, as it works by measuring the amount of air entering the measuring tube (Pito tube); ergo a large head wind (blowing into the front of the aircraft) will give a higher indicated air speed than may actually be true.
ias dial

Is there a maximum limit to gravity?

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Asked by Wiki User

According to current theories of physics, there is no maximum limit to gravity. Gravity can become arbitrarily strong if a sufficient amount of mass or energy is concentrated in a small enough space. However, at extreme conditions such as those inside a black hole or during the early stages of the universe, our current understanding of physics may break down.