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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

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

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

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

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

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

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

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

Defining Characteristics of the Planets

1. ____________________ Has similarities to the Earth in that it has seasonal changes, polar caps, and rotates in about 24 hours. It's surface has a red color due to iron oxide in the rock. Has numerous indications of ancient water flows. Has the highest mountain in the solar system. 3. ____________________ Its r


The origin of the Moon is a. a complete mystery to scientists b. the result of an ancient collision between Earth and another large body c. cannot be adequately hypothesized without more expeditions to the Moon d. the same as the origin of the Earth. The magnetic field of a planet depends o

Keplers 3rd law and derivations of it.

Attached are three questions. the first relates to kepler's 3rd law and calculating the maxima and minima of acceleration of a planet around a Sun. The second asks for this equation to be combined with Newton's law of universal gravitation to find the mass of the sun and the third asks for the period of another planet with a lar

Physics -Multiple choice questions and essay questions

1. The ratio of (1 kilogram/1 milligram) is a) 10^2 b) 10^3 c) 10^6 d) 10^-3 e) 10^-6 2. The length of each side of a square is 4.0 m. What is the length of the diagonal of the square (shown as a dashed line in the figure)? 4.0 x 4.0 a) 2.8m b) 3.5m c) 5.7m d) 8.0m e) 16m 3. Which statement is true concerning sc

Description of Star Characteristics

Here is what I would like some comments on: brief overview of the nature and importance of light and other electromagnetic waves. How stars fit in the hierarchy of the universe characteristics of stars Processes by which stars live and die how the materials are recycled and how this process might be related t

PHYSICS WITH Algebra Basics, Equations, and Mathematical Models

PLEASE SHOW WORK, POST FORMULA, CALCULATIONS AND ANSWER- Search the Internet to find the mass and radius of Mars, Venus and Jupiter in our solar system. THE MASSES MUST BE EXPRESSES IN KILOGRAMS AND RADII EXPRESSED IN METERS 1. Using your data, calculate the gravitational acceleration on each of the three planets

Acceleration of a Person on Mars

Mars has a mass of 6.46 x 10^23 kg and a radius of 3.39 x 10^6 m. What is the acceleration due to gravity on Mars and how much would a 65 kg person weigh on this planet?

20 Multiple Choice Questions

1) A 2-kg ball is moving with a constant speed of 5 m/s in a horizontal circle whose radius is 50 cm. What is the magnitude of the net force on the ball? a. 0 N b. 20 N c. 40 N d. 100 N 2) Kepler's second law tells us that planets sweep out equal areas in equal times. If you compare the amount of area per time swept b

Motion in a Plane

1.) An astronaut shipwrecked on a distant planet with unknown characteristics is on top of a cliff, which he wishes to descend. He does not know the acceleration due to gravity on the planet, and he has only a good watch with which to make measurements. He wants to learn the height of the cliff, and to do this, he makes two meas

Gravitation, centripetal acceleration, and weight

Planet X rotates in the same manner as the earth, around an azis through its north and south poles, and is perfectly spherical. An astronaut who weighs 943.0 N on the earth weighs 915.0 N at the north pole of Planet X and only 850.0 N at its equator. The distance from the norht pole to the quator is 18,850 km, measured along the

Gravitation: Force, motion of satellite, Kepler's law

1. A 8754-kg satellite is orbiting planet Y at an altitude of 1.69x10^6 meters above its surface and with an orbital period of 15.2 hours. If the planet has a mass of 8.19x10^24 kg, then determine the radius of planet Y. 2. Suppose the earth had another moon which was 1.69 times as far from the center of the earth as our own

Physics: Conversion and Distance Calculations

1. Suppose my car engine has a displacement of 350 cubic inches. I wish to compare this with a European car which has a displacement of 1.7 liters. Convert 350 cubic inches to liters. 2. Suppose an astronaut on an alien planet drops a hammer and finds that it falls a total distance of 6.0 yards in 2.0 seconds. a. How far w

Gravity Discussion

You are working for a telecommunication company that has several satellites in orbit. Your job is to work with NASA to monitor the satellites to see that they are functioning satisfactorily. One day, to your horror, an expensive 300-kg satellite orbiting at a height of 2000 km above the Earth surface has a freak accident with an