The world's largest refracting telescope is operated at the Yerkes Observatory in Wisconsin. It has an objective of diameter of 1.02 m
Suppose such an instrument could be mounted on a spy satellite at an elevation of 300. km above the surface of the Earth. What is the minimum separation of two objects on the ground if their images are to be clearly resolved by this lens? (Assume an average wavelength of 0.55 ?m for white light.)
0.20 m
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Potential: If the result of your calculation of a quantity has SI units of kg ? m/(s2 ? C), that quantity could be
A. an electric field strength. B. a dielectric constant. C. an electric potential difference. D. a capacitance E. an electric potential energy.
Characteristics of Waves: An earthquake generates three kinds of waves: surface waves (L-waves), which are the slowest and weakest, shear (S) waves, which are transverse waves and carry most of the energy, and pressure (P) waves, which are longitudinal waves and are the fastest. The speed of P waves is approximately 7 km/s, and that of S waves is about 4 km/s. People do not generally feel the P waves, but animals seem to be sensitive to them. If a person reports that her dog started barking 20 seconds "before the earthquake," then approximately how far was the origin of the earthquake?
A. 100 km B. 200 km C. 300 km D. 400 km E. 500 km
In the figure, if the tension in string 1 is 34 N and the tension in string 2 is 24 N, what is the mass of the object shown?
?
?
A. 7.3 kg B. 5.5 kg C. 1.8 kg D. 3.7 kg E. 4.5 kg
List at least three things that make Earth unique among the terrestrial planets.
Fill in the blank(s) with the appropriate word(s).