Related InterviewSolutions

• A rocket ship is coasting toward a planet. Its captain wishes to know the value of g at the surface of the planet. This may be inferred by: A. measuring the apparent weight of one of the crew B. measuring the apparent weight of an object of known mass in the ship C. measuring the diameter of the planet D. measuring the density of the planet E. observing the ship’s acceleration and correcting for the distance from the center of the planet.
• The distance of a geostationary  satellites  from the centre of the earth ( radius = 6400 km) is nearest  toA) 5RB)7RC)10RD) 18R
• If Earth were to rotate only 100 times per year about its axis: A. airplanes flying west to east would make better time B. we would fly off Earth’s surface C. our apparent weight would slightly increase D. Earth’s atmosphere would float into outer space E. our apparent weight would slightly decrease 
• The mass density of a certain planet has spherical symmetry but varies in such a way that the mass inside every spherical surface with center at the center of the planet is proportional to the radius of the surface. If r is the distance from the center of the planet to a point mass inside the planet, the gravitational force on the mass is: A. not dependent on r B. proportional to r2 C. proportional to r D. proportional to 1/r E. proportional to 1/r2
• An astronaut in an orbiting spacecraft feels “weightless” because she: A. is beyond the range of gravity B. is pulled outward by centrifugal force C. has no acceleration D. has the same acceleration as the spacecraft E. is outside Earth’s atmosphere
• The magnitude of the acceleration of a planet in orbit around the Sun is proportional to: A. the mass of the planet B. the mass of the Sun C. the distance between the planet and the Sun D. the reciprocal of the distance between the planet and the Sun E. the product of the mass of the planet and the mass of the Sun
• A particle might be placed 1. inside a uniform spherical shell of mass M, but not at the center 2. inside a uniform spherical shell of mass M, at the center 3. outside a uniform spherical shell of mass M, a distance r from the center 4. outside a uniform solid sphere of mass M, a distance 2r from the center Rank these situations according to the magnitude of the gravitational force on the particle, least to greatest. A. All tie B. 1, 2, 3, 4 C. 1 and 2 tie, then 3 and 4 tie D. 1 and 2 tie, then 3, then 4 E. 1 and 2 tie, then 4, then 3
• Earth exerts a gravitational force on the Moon, keeping it in its orbit. The reaction to this force, in the sense of Newton’s third law, is: A. the centripetal force on the Moon B. the nearly circular orbit of the Moon C. the gravitational force on Earth by the Moon D. the tides due to the Moon E. the apple hitting Newton on the head. 
• Given the perihelion distance, aphelion distance, and speed at perihelion of a planet, which of the following CANNOT be calculated? A. The mass of the star B. The mass of the planet C. The speed of the planet at aphelion D. The period of orbitE. The semi major axis of the orbit
• Consider the statement: “Earth moves in a stable orbit around the Sun and is therefore in equilibrium”. The statement is: A. false, because no moving body can be in equilibrium B. true, because Earth does not fall into or fly away from the Sun C. false, because Earth is rotating on its axis and no rotating body can be in equilibrium D. false, because Earth has a considerable acceleration E. true, because if it were not in equilibrium then buildings and structures would not be stable