Fundy. Which of the following gives the approximate amplitude and period of the tides? Amplitude Period A. 6.5 m 6 hours B. 13 m 12 hours C. 6.5 m 12 hours D. 13 m 6 hours 16. Light of wavelength is emitted by two point sources. The light passes through a circular aperture λ of diameter and is received by an observer. The angular separation of the sources from the b position is The sources are not resolved by the observer. Which of the following observer’s θ. mathematical relationships applies? A. < 1.22 θ B. > 1.22 θ C. = 1.22 θ D. = θ A spherical planet of uniform density has three times the mass of the Earth and twice the average 17. radius. The magnitude of the gravitational field strength at the surface of the Earth is g. What is the gravitational field strength at the surface of the planet? A. 6 g B. C. D. 18. A spacecraft travels away from Earth in a straight line with its motors shut down. At one instant the speed of the spacecraft is 5.4 km s–1. After a time of 600 s, the speed is 5.1 km s–1. The average gravitational field strength acting on the spacecraft during this time interval is A. 5.0 × 10–4 N kg–1 B. 3.0 × 10–2 N kg–1 C. 5.0 × 10–1 N kg–1 D. 30 N kg–1 19. A small sphere X of mass is placed a distance from a point mass. The gravitational force on M d sphere X is 90 N. Sphere X is removed and a second sphere Y of mass 4M is placed a distance 3d from the same point mass. The gravitational force on sphere Y is
Fundy. Which of the following gives the approximate amplitude and period of the tides? Amplitude Period A. 6.5 m 6 hours B. 13 m 12 hours C. 6.5 m 12 hours D. 13 m 6 hours 16. Light of wavelength λ is emitted by two point sources. The light passes through a circular aperture of diameter b and is received by an observer. The angular separation of the sources from the observer’s position is θ. The sources are not resolved by the observer. Which of the following mathematical relationships applies? A. θ < 1.22 B. θ > 1.22 C. θ = 1.22 D. θ = 17. A spherical planet of uniform density has three times the mass of the Earth and twice the average radius. The magnitude of the gravitational field strength at the surface of the Earth is g. What is the gravitational field strength at the surface of the planet? A. 6 g B. C. D. 18. A spacecraft travels away from Earth in a straight line with its motors shut down. At one instant the speed of the spacecraft is 5.4 km s–1. After a time of 600 s, the speed is 5.1 km s–1. The average gravitational field strength acting on the spacecraft during this time interval is A. 5.0 × 10–4 N kg–1 B. 3.0 × 10–2 N kg–1 C. 5.0 × 10–1 N kg–1 D. 30 N kg–1 19. A small sphere X of mass M is placed a distance d from a point mass. The gravitational force on sphere X is 90 N. Sphere X is removed and a second sphere Y of mass 4M is placed a distance 3d from the same point mass. The gravitational force on sphere Y is
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