What determines the end of our universe?
Is it defined by the farthest out physical object or is it defined
by the farthest out form of energy like light?
This article is good for the subject. It is determined only by the expansion of universe as far as we know. We can still think of the fact that, "If the universe had a beginning (like the Big Bang), then it should definitely have an end"...
For now, the universe is expanding and expanding. It is not defined by light nor a farther object. But instead, a spread-out hypothetical energy called dark energy. The interaction of this energy with gravity causes the acceleration of universe. From 2011, we can slightly incline over the expectation of a Big Rip.
What determines the end of our universe? Is it defined by the farthest out physical object...
What are the implications of the three main types of geometry for the structure and fate of our universe? (That is, what does it mean for our universe if its overall geometry is flat, positively curved, or negatively curved?) Why are 2-D and even 3-D models not the best for describing our universe? Some scientists (especially string theorists) have suggested there are higher dimensions. Why would higher dimensions need to exist in their models? If the universe does expand forever,...
need help thanks. 16. True or False Quantum Mechanics represented a revolution in our understanding of the nature of the universe. For light: shorter wavelength = higher frequency = lower energy. Quantum Mechanics is an interesting theoretical science that does not really tell us anything especially important about atoms. Einstein's work leads to the conclusion that light is strictly a wave-like phenomenon.. The Schrodinger equation is a part of wave mechanics that assumes the wave property of the electron determines...
What determines the wavelength of light emitted by an object? Its density Its size Its volume Its temperature
Weeks 5, 6: How is Olber's paradox solved? Does the Universe have a center or an edge? What is the cosmological principle? The Universe expands: why, how, and how do we know? What is cosmological redshift? What is the Big Bang? How old/big/fast is the Universe? How do Hubble's constant, the critical density of the flat universe, and the density parameter help us understand those properties of the Universe? What is the cosmic light horizon and why is it the...
1. Heat is best defined as a. massless substance emitted when something burns. b. a form of potential energy. c. a form of work. d. the total energy that a substance has. e. energy transferred as the result of a temperature difference. 2. The energy stored in chemical bonds is a form of a. kinetic energy. d. heat. b. thermal energy. e. mechanical energy. c. potential energy. 3. Energy that an object has by virtue of its motion is called...
Homework questions 1) Why did astronomers expect to find that the universe was decelerating? What is it actually doing? 2) What is meant by the "critical density of the universe? How is it related to the different models of the universe? 3) How was the interactions of particles different when the universe was a hundredth of a second old, 3 minutes old, and 500,000 years old? 4) Why don't we know what the universe was like at its actual birth...
#3. a) The human brain, assuming it were approximately spherical, would have a radius of about 6.7 centimeters and a mass of about 1.5 kilograms. Given these values, there is a number such that, simply by actually storing this number in your brain (a.k.a "just thinking it"), your brain should immediately collapse into a black hole. Calculate this number (don't worry, you're only going to represent it with some symbols, like how there's no danger in writing ). b) The...
On a 20 meter diving board hinged at the right end, sticking out over a pool, where would you place a 40kg person so that it had the greatest torque? Answer: At the farthest point from the hinge. If the person was placed at the very end, what is the magnitude of force that keeps the diving board in static equilibrium? Answer: 7840 N The answers are given, but I would like to know how to get these answers.
1- What physical quantity is represented by the slope of a Position vs. Time plot? What are its dimensions? How did you know? Please explain. 2- What physical quantity is represented by the slope of a Velocity vs. Time plot? What are its dimensions? How did you figure it out? Please explain. 3- What would the Acceleration vs. Time plot look like for an object moving at constant velocity? Try drawing it and uploading a picture of your graph.
10. A small object of mass m, on the end of a light cord, is held horizontally at a distance r from a fixed support as shown. The object is then released. What is the tension in the cord when the object is at the lowest point of its swing? 11. A wooden brick slides on a horizontal frictionless floor with a constant velocity v. On the brick's path there is a 50 cm long rough area with a friction...