Ch 15 Lab Gravity

What force holds the Earth in its place in the solar system? a. The gravitational pull caused by the moon within its orbit around the Earth b. The gravitational pull caused by the sun within the solar system  c. The gravitational pull caused by the black hole in the center of the Milky Way   d. The gravitational pull caused by Venus and Mars within the solar system

21. The maximum acceleration of a car while towing a second identical car, compared to its acceleration with no car in tow, is A. one half. E. none of these B. one third. C. one fourth. D. would fly off in a hyperbolic path would spiral in rather quickly on cosmic time scales something else the same. 22. If an alien life form would suddenly cause the Sun to collapse into a black hole, the Earth A. would get sucked in immediately B. would fly off in a straight line C. D. E.

A planet and moon pictured above have identical densities. Identify the magnitude of the value that is identical to both cosmic bodies assuming that the only force they experience is their gravitational attraction for each other. O A. Kinetic energy O B. Velocity O C. Acceleration O D. Displacement from the center of mass O E. Gravitational force

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An isolated black hole in space would be difficult to detect because   a. there would be no light source nearby.   b. it would not be rotating rapidly.   c. it would be stationary.   d. very little matter would be falling into it.   e. there would be very few stars behind it whose light it could block out.

What evidence supports the predicted existence of gravitational waves? A. Gravitational waves are frequently and easily detected by large telescopes. B. Gravitational waves have been detected by observing their effect on large masses suspended on Earth. C. The orbit of a star system consisting of two neutron stars is slowly decaying, suggesting that energy is being carried away by gravitational waves. D. The energy generated by gravitational waves from the Sun can be seen as it is absorbed by Jupiter. E. Photographs of spacetime show the gravitational waves as ripples that are clearly visible.

If the mass and radius of Mars are 6.39 × 1023 kg and 3.4 × 106 m, respectively, what is the escape velocity needed for a spaceship of mass 25,000 kg to escape the gravitational potential well of Mars?  A) 1,200 m/s B). 8,658 m/s C). 7,270 m/s D). 5,022 m/s

1 What will happen to the gravitational force between two massive spheres? * A.The spheres will always have an attraction? B.The force of attraction between two spheres always depends on how massive they are. C.The force of attraction between two spheres depends inversely on the square of the distances between them. D.All of the above.   2. Which of the following will you use to measure the distance when calculating the gravitational force between two extended bodies? * A.Distance should be calculated from the center of each body. B.Distance should be calculated from the closest points on each body. C.Distance should be calculated from the most distant points on each body. D. Distance should be calculated from the center of one body to the closest point on the other body.   3. What do you think will happen to the force of gravitational attraction if the distance between two objects were doubled? * A.The force of gravitational…

a. Find the acceleration due to gravity at the surface of a neutron star of mass 1.5 solar masses and having a radius of R = 10.0 km. b. Find the weight of a 0.120-kg baseball on the surface of this star. c. Assume the equation U = mgh applies, and calculate the energy that a 70.0-kg person would expend climbing a 1.00-cm-tall mountain on the neutron star. d. Find the speed needed by a small satellite to maintain a circular orbit with a radius of 2R around the neutron star.

Pluto has a mass of 1.3x1023kg, and a radius of 1.15x106m. a.Determine the gravitational field strength on the surface of Pluto. b.Determine the gravitational field strength 5.4x105m from the surface of the planet. c. If a 2000kg spacecraftis located at the positionmentioned in the previous question, how fast would the spacecraftneed to travel to orbit Pluto in a circular orbit?

SUBJECT : GENERAL PHYSICS I. NEWTON’S LAW OF UNIVERSAL GRAVITATION 1. If the masses remain the same, but the distance of separation is decreased to one-half the original distance, what happens to gravitational force? A. Gravitational force decreases by a factor of 4 B. Gravitational force increases by a factor of 4. C. Gravitational force will be halved. D. Gravitational force will be doubled. 2. The gravitational force between two identical spheres is given as 4 x 10-5 N. The spheres are separated by a distance of 0.060 m at the center. What is the mass of each sphere? A. 464.6 kilograms B. 46.46 grams C. 46460 grams. D. 464.6 grams 3. Determine the gravitational force between Earth and the Sun. Mass of Earth = 5.972 X 1024 kg. Mass of Sun = 1.988 x 1030 kg. Mean Distance = 149,600,000 km A. 5.43 x 10^22 N B. 4.35 x 10^22 N C. 4.53 x 10^22 N D. 3.54 x 10^22 N

In 2004 astronomers reported the discovery of a large Jupiter-sized planet orbiting very close to the star HD 179949 (hence the term "hot Jupiter"). The orbit was just 1/9 the distance of Mercury from our Sun, and it takes the planet only 3.09 days to make one orbit (assumed to be circular). a. What is the mass of the star? Express your answer in kilograms and as a multiple of our Sun's mass. b. How fast (in km/s) is this planet moving?

Einstein said that gravity exists because: *   A. massive objects warp space. B. of the existence of black holes. C. massive objects attract one another. D. light moves randomly throughout the universe.   How do scientists / astronomers spot a black hole? *   A. by using gamma rays and x-rays to detect high energy sources B. by using radioactive waves to detect high energy sources C. By using high energy to detect gamma rays and x-rays D. By using massive telescopes to detect gamma ray   If you place your index just in front of you and try to look at it with you right eye open and your left eye close, then look at it with your left eye open and right eye close this time. You will notice that there is a slight change of the position of your index finger. What concept is applied how astronomers were able to measure the distance of heavenly bodies from the Earth? *   A. Cosmic distance ladder B. Parallax C. Luminosity…

Which of the following statements about gravitational force, Fg , is not correct? a. Gravitational force is an attractive force only; it is never repulsive. b. Gravitational forces always exist in pairs of equal magnitude. c. The gravitational force between two objects depends on their separation. d. Gravitational force is the strongest of the fundamental forces.

2. In a binary star system, the two stars orbit the center of mass of the system. If both stars have the same mass M, the center of mass will be midway between the stars. Assume the orbital radius is R. Answer in terms of G, M and R. a. Determine the orbital speed of the stars. (Your answer should not be the same as the answer for 1b.) Note that the Earth and moon also actually both orbit around the center of mass of the Earth-moon system. However, the Earth is so much more massive than the moon that the center of mass is very close to the center of the Earth and as an approximation we say the moon orbits around the Earth. b. A space probe is exactly halfway between the two stars. Determine the minimum speed the space probe must be moving so that it can escape from the binary star-that is the space probe can just reach an infinite distance away from the stars. This speed is called the escape speed. C. * We want to just reach infinity. This means we will have zero speed at infinity.…