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Search for Extraterrestrial Life

Please comment on the following statement. No personal opinions please - search the web for suitable articles and comment on them. Please list the websites you use. Is it a waste of time and resources to listen for signals from intelligent life in the Universe?

Astronomy and Scientific Theory

1. It might be possible to prove a scientific theory false, it is never possible to prove it true. Explain. 2. How is retrograde motion explained by (a) the geocentric model and (b) the heliocentric model of the universe ? 3. If you lived at a latitude of 72°N, what is the angle between the northern horizon and the Pole-s

Basic Outer Solar System Questions

1. Why is the outer atmosphere of Jupiter so colourful, whereas those of the other gas giants are dull and monotone? 2. Why do Uranus and Neptune not have cores of metallic hydrogen? 3. The axis of rotation of Uranus is tilted at 97°C to its orbit. What could be the cause of this?

Inelastic collions and determining height of a tree

1 A comet fragment of mas 1.96 x 10^13 kg is moving at 6.50 x 10 ^4 m/s when it crashes into Callisto, a moon of Jupiter. The mass of Callisto is 1.08 x 10^23 kg. The collision is completely inelastic. Assuming for this calculation that Callistos initial momentum is zero kg(m/s), what is the recoil speed of Callisto immediately

Weight change on another planet

A. If you moved to a planet that has the same mass as the Earth but twice the diameter, how would your weight be affected? b. If you moved to a planet that has twice the mass of the Earth and also twice the diameter, how would your weight be affected?

Mercury is poured into a U tube. To determine the levels in two limbs.

Mercury is poured into a U tube in which the cross sectional area of the right limb is three times larger than the left one. The level of the mercury in the narrow limb is 30.0 cm from the upper end of the tube. How much will the mercury level rise in the right limb when the left limb is filled to the top with water. (Also se

Plate Tectonics

How does the plate tectonics theory help explain the existence of fossil marine life in rocks atop the Ural Mountains?

Scwarzschild radius

The Schwarzschild radius describes the critical value to which the radius of a massive body must be reduced for it to become a black hole. R = 2 G M / c 2 where G = gravitational constant 6.7x10 -11 M= mass of the object C = speed of light 3x10 8 The sun has M = 2x10 30 . What is the Schwarzschild radius

Nine problems on gravitation, rotational motion, oscillatory motion

5. Zero, a hypothetical planet, has a mass of 4.0 x 10^23 kg, a radius of 3.0 x 10^6 m, and no atmosphere. A 15 kg space probe is to be launched vertically from its surface. (a) If the probe is launched with an initial kinetic energy of 5.0 x 10^7 J, what will be its kinetic energy when it is 4.0 x 10^6 m from the center of Z

Mass, Volume, Density and Vernier Questions

Need help with those questions. Q1) A pile of 500 sheets of paper has a mass of 2 kg. The pile is 300mm long, 200mm wide and 50 mm thick. Calculate a) the thickness of the sheet b) the mass of one sheet. c) The volume of the pile d) The density of the paper e) The mass of a one square metre sheet of this paper. Q2) A

Energy Conservation: Minimum Launch Speed

You are on Jupiter and would like to send a probe into space so that it does not fall back to the surface. What minimum launch speed do you need if Jupiter's mass is 1.9 x 10^27?

Newton's Gravity and Escape Velocity

1. How would you describe the "use of Newton's gravity to hold the solar system together" to an elementary school child? Give some examples and situations that you might find helpful in describing gravity. 2. What is gravity? Describe gravity throughout the universe. 3. What is escape velocity? Is it the same everywhere? W

Solar System and Motions of the Planets

2. Describe a coordinate system that could be used to locate uniquely the seats in the classrooms of a multi-story building with one classroom on each floor. How many coordinates are needed in this case? 6. What is the orientation of the celestial equator for observers at the Earth's equator? 14. The Julian calendar, inst

Gauss law and gravitation

A planet of density rho (spherical core radius R1) with thick spherical cloud of dust (density rho2 and radius R2) is discovered. what is teh force on a particle of mass m placed within the cloud?

Journey Through the Universe

2. Describe the place of astrology in science. How did the development of astrology follow or parallel the development of astronomy? What do you think were some causes for them to split or diverge? 3. Constellations are "just dot to dot" drawings. Why do you believe the ancient people took so much time to describe the stars

collision of railroad cars and gravitational attraction

1. A 9000kg railroad car moving at 3m/s strikes a stationary (not moving) 5000kg railroad car. what is the kinetic energy of the 9000kg railroad car before the collision? What is the momentum of the 9000kg railroad car before the collision? If the two railroad cars couple and move off together after the collision, what is their

How do we know that someone living on Mars, could live on Earth?

When they look at life on another planet, I think that the base is Earth, how does it compare to the atmosphere on Earth? How do we know that someone living on Mars, could live on Earth? So just because the atmosphere has little oxygen, does that mean that some other life can live without it?

The formation is atmospheres

This job considers how atmospheres form. Given that Venus, Earth, and Mars are all terrestrial planets, the posting briefly discusses how they could end up with such different atmospheres.

Pick a planet in the Solar System that has a surface.

Pick a planet or moon other than Earth in the Solar System that has a surface. Discuss what geological processes you expect to see on that planet or moon, and why. Do not pick a gas giant; pick one with a surface that undergoes at least one of the four geological processes.

Fluid pressure on Venus

The surface pressure on Venus is 92 atm, and the acceleration due to gravity there is 0.894g. In a future exploratory mission, an upright cylindrical tank of benzene is sealed at the top but still pressurized at 92 atm just above the benzene. The tank has a diameter of 1.67 m, and the benzene column is 10.00 m tall. Ignore any e

Mass of a Sample of Mercury

(1) The density of mercury is 1.36 x 10^4 kg/m^3. What is the mass of of a 4.00 10^-4 -m^3 sample of mercury? (2) A force of 250N is applied to a hydraulic jack piston that is 0.01m in diameter. If the piston which supports the load has a diameter of 0.10m, approx. how much mass can be lifted by the force? Ignore any diffe

The energy source of stars is primarily associated with

1) The energy source of stars is primarily associated with : a) the reactions of atoms in the core b) the reactions of nuclei in the core c) the reactions of atoms in the outer regions d) burning of elements until they become radioactive e) burning of elements heavier than lead. 2) Which of the following affect the

Word Association

Please answer the following: If sun is to solar then moon is to: orbit, lunar, planet or space. If system is to procedure then task is to: plan, activity, process or strategy. If clear is to transparent then opaque is to: color, murky, fuzzy or open. If drive is to energy then patience is to: tolerance, clarity, verv

Jets at High Altitudes

Why is the air in jet aircraft flying at high altitudes pressurized? Gases move from regions of high pressure to regions of low pressure. What force keeps the gases of the earth's atmosphere from diffusing into interplanetary space, where the pressure is essentially zero?

Moon, Satellite, Probe, Orbital Calculations

1. Compute the period of a satellite placed into orbit around the Earth at a distance of tenth that to the Moon. 2. The local solar time at 75°W is 12:00 noon. What is the longitude of an observer who sees the full moon on her meridian at this time? 3. At what longitude is an observer who sees the last-quarter moon on his mer

What is the mass of HD68988?

On October 15, 2001, a planet was discovered orbiting around the star HD68988. Its orbital distance was measured to be 10.5 million kilometers from the center of the star, and its orbital period was estimated at 6.3 days. Part A: What is the mass of HD68988? (M = ? kg) Part B: Express your answer in terms of our sun's mass

Kepler's Third Law / Sunlight to Pluto

I need written out steps and final answer. These 2 questions are giving me a headache. I've been working on them for 2 days and I still can't figure it out. My teacher cannot break it down enough for me to understand. 1. Use the modified form of Kepler's third law to calculate Pluto's mass from the orbital data for Charon