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  • Get Answer Procedure: Making the Measurements:1. In your browser, open the link to the simulation we will be using: - Question Get Answer Procedure: Making the Measurements:1. In your browser, open the link to the simulation we will be using: http://wittman.physics.ucdavis.edu/Animations/CosmicExpansion/index.html2. Move the sliding bar back and forth to get a feel for the simulation. Note that as you move the bar forward, time progresses and the Universe expands. Slide the bar all the way to the right and make sure all the galaxies still fit on your screen; if the bottom galaxy is off the screen, you may need to scroll down a bit so they are all visible. Also take note of the galaxy that doesn't move. This is the reference galaxy--from our point of view, it's our own galaxy, the Milky Way. We are going to measure the distance and speeds of the galaxies in this simulation, and verify that Hubble's Law holds for this expanding Universe. We do this as follows:3. Tape a piece of paper to your screen. Make sure all of the galaxies fit on the paper, even when the bar is all the way to the left. Use two pieces of tape on the top side of the paper, so that you can lift the paper up and see the screen when necessary.4. Now move the bar back to the beginning. Using a pencil, mark the position of the Milky Way with a dot. Then mark the positions of the eight other galaxies with dots (placing a dot at the central bright nucleus of each galaxy), then label the dots 1 through 8.5. Using a ruler, measure the distance of each galaxy (1-8) from the Milky Way and record them in the table as di (see example table below). Centimeters are preferable if your ruler has them; if not, use inches. Specify your units in the table.6. Next, slowly slide the bar all the way to the right at a steady rate, taking approximately 6 seconds to do so. Mark the new positions of each galaxy 1-8 with dots. Again, measure the new distance of each galaxy from the Milky Way, recording them in your table as df.7. Subtract the first measurement from…

    Get Answer Procedure: Making the Measurements:1. In your browser, open the link to the simulation we will be using: Read More »

  • -The accepted value of the radius of the Earth is 6.3781 × - Question Get Answer -The accepted value of the radius of the Earth is 6.3781 × 106 m. Compute the percent error between your result of R and the accepted value. Show your work below. -Rays from the Sun could strike the Earth with a different angle limited by your calculation above. Is the assumption of parallel light from the Sun a good approximation—considering the angles you are working with—to find the curvature of the Earth? Why or why not? -The average distance between Earth and the Sun is 1 AU = 1.49 × 108 km. If the Earth has a circular orbit with the Sun at the middle of the circle, what is the circumference of Earth's orbit in km? Show your work and report your answer with 3 significant digits. 246.The REQUIRED condition for the angular momentum of an object to be conserved (i.e.,to not change) is thatA)the speed of 246.The REQUIRED condition for the angular momentum of an object to be conserved (i.e.,to not change) is thatA)the speed of the object does not change.B)the object is not acted on by an internal torque (caused, for example, by the muscles in a skater's arms).C)the object is not acted on by an outside torque.D)the size of the object does not change. 267.In the years after Newton published his laws of motion, it was found that the observed positions of the planet 267.In the years after Newton published his laws of motion, it was found that the observed positions of the planet Uranus did not match the predictions of Newton's theory. The reason for this turned out to beA)the perturbing effects of Jupiter and Saturn, whose masses at that time were not accurately known.B)the perturbing effect of Neptune, which at that time had not yet been discovered.C)the perturbing effect of Pluto, which at that time had not yet been discovered.D)the weakening of gravity with increasing distance from the Sun. 1.The temperature fluctuations in the Cosmic Microwave Background are due to quantum mechanical fluctuations. T/F Question 1.The temperature fluctuations in the Cosmic Microwave Background are due to quantum mechanical fluctuations. T/F 2.The…

    -The accepted value of the radius of the Earth is 6.3781 × Read More »

  • 238.The strength of gravity on Mars is about 40% of that on the Earth. If you were to take a - 238.The strength of gravity on Mars is about 40% of that on the Earth. If you were to take a standard red brick to Mars, which property of the brick would be significantly different on Mars than on the Earth?A) Its mass B) Its color C) Its volume D) Its weight 109.Tycho BraheA)developed a reflecting telescope, which used a curved mirror to focus the light.B)developed the first detailed heliocentric model for 109.Tycho BraheA)developed a reflecting telescope, which used a curved mirror to focus the light.B)developed the first detailed heliocentric model for the solar system, which replaced the geocentric model of Ptolemy.C)improved the refracting telescope, which allowed him to extend Galileo's observations of the sky.D)made accurate measurements of planetary positions, which Kepler later used to find the shapes of planetary orbits. 123.The eccentricity of a planet's orbit describesA)the tilt of the planet's spin axis with respect to its orbital plane.B)its shape 123.The eccentricity of a planet's orbit describesA)the tilt of the planet's spin axis with respect to its orbital plane.B)its shape compared to that of a circle.C)its motion at any specific point in its orbit as seen from the Earth, that is, whether direct, retrograde, or stationary.D)its tilt with respect to the plane of the Earth's orbit (the ecliptic plane). 138.If the line joining a planet to the Sun sweeps out a particular area in 1 day, then in 2 138.If the line joining a planet to the Sun sweeps out a particular area in 1 day, then in 2 days it will sweep outA)less than twice the area if the planet is approaching perihelion and more than twice the area if it is leaving perihelion.B)half the area.C)more than twice the area if the planet is approaching perihelion and less than twice the area if it is leaving perihelion.D)exactly twice the area. 166.Suppose we were to observe two supernovas (exploding stars) exploding in our night sky on a particular night. If one 166.Suppose we were to observe two supernovas (exploding stars) exploding in our night sky on a particular night. If one was in the nearby arm of our Milky Way…

    238.The strength of gravity on Mars is about 40% of that on the Earth. If you were to take a Read More »

  • 93.The sidereal period of a planet is defined asA)the time between two successive passages of the planet in front of - 93.The sidereal period of a planet is defined asA)the time between two successive passages of the planet in front of a particular point in the sky (e.g., a star) as seen from the Sun.B)the time between two successive passages of the planet in front of a particular point in the sky (e.g., a star) as seen from the Earth.C)the time between two successive identical configurations (e.g., opposition to opposition).D)the time between two successive greatest elongations (e.g., greatest western elongation to greatest eastern elongation). Newton's law of universal gravitation states that the gravitational force exerted by an object on any other object anywhere Question Newton's law of universal gravitation states that the gravitational force exerted by an object on any other object anywhere in the universe is given by F= gm1m2/r2 equation where G is the universal gravitational constant (= 6.67 x 10 -11 N.m 2/kg 2), m1 is mass 1, m2 is mass 2, and r is the distance between the two masses (from center to center). If both masses m1 and m2 are doubled, the gravitational force between the two masses Estimate the number of Solar neutrinos passing through a detector Question Get Answer Estimate the number of Solar neutrinos passing through a detector on the Earth in one second. Assume that the detector has a surface area of 1.0 square meters and is aligned so that it faces directly towards the centre of the Sun. Assume that every neutrino travels without any change (i.e. none are absorbed or converted to a different particle). Also assume that the energy carried out of the Sun by the neutrinos is negligible 5.In science, if new and reliable observations disagree with a well-established theory, thenA)this shows the futility of attempting to understand 5.In science, if new and reliable observations disagree with a well-established theory, thenA)this shows the futility of attempting to understand the universe. The observations should be classified for future reference and the theory retained as the best explanation of the phenomenon.B)the observations must be discarded.C)the theory must be discarded immediately.D)the theory must be modified to account for the observations, and…

    93.The sidereal period of a planet is defined asA)the time between two successive passages of the planet in front of Read More »

  • Meihui is at NASA analyzing Moon rocks. In one of the rocks from the - Question Meihui is at NASA analyzing Moon rocks. In one of the rocks from the lunar highlands, he discovered 40 % of the original uranium-238 remains, while remaining amount of uranium-238 had decayed into lead. The half life of uranium-238 is 4.5 × 109 years. Assume the only decay product is lead. How old is the lunar maria rock in billions of years (109 years)? Astronomy Ph 111Chapter 10 name- Stellar Graveyard. List Question Astronomy Ph 111Chapter 10 name- Stellar Graveyard. List 3 videos that teach the material in Ch. 10 well (White Dwarfs, Neutron Stars, and Black holes).1- https://www.youtube.com/watch?v=krugypzZMTo When observed throughout the year, the planets that are farther from Question When observed throughout the year, the planets that are farther from the Sun than Earth appear to exhibit retrograde motion in their orbits. This means they will move in one direction in the sky and then appear to move backwards before returning to their original trajectory. The interactive shows this motion in the top panel. greene explains that though the big bang theory explains how the Question greene explains that though the big bang theory explains how the universe evolved, it fails to explain what actually powered the bang. how does greene say the big bang was powered and based on this theory, discuss what this means regarding the possible existence of other universes Two satellites are orbiting the Earth in circular orbits - not at Question Two satellites are orbiting the Earth in circular orbits - not at the same altitude or inclination. What sequence of orbit changes and plane changes would most efficiently place the lower satellite in the same orbit as the higher one? Assume only one maneuver can be performed at a time, i.e. a plane change or an orbit transfer. Figure 5 shows a view of the icy surface of Jupiter's moon, Europa. It Question Figure 5 shows a view of the icy surface of Jupiter's moon, Europa. It is a mosaic of two pictures taken by the Solid State Imaging system onboard the Galileo spacecraft during a close flyby of Europa on…

    Meihui is at NASA analyzing Moon rocks. In one of the rocks from the Read More »

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