How did the NEAR mission break new ground, literally?
What will be an ideal response?
The NEAR (Near-Earth Asteroid Rendezvous) mission first flew past Mathilde, revealing it to be less dense than any other asteroid. Then it went into orbit about the asteroid Eros, mapping it thoroughly. Finally, it soft-landed on the surface of Eros, the first time a man-made object landed on a minor planet.
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A total impedance of an RC circuit with a capacitance of 40.0 ?F is 800 ?. If the frequency of the applied ac voltage is 18.0 Hz, what is the resistance of the circuit?
A) 569 ? B) 669 ? C) 769 ? D) 869 ? E) 800 ?
A 35-mm camera equipped with a 95 mm focal length lens is used to photograph a tree that is 8.0 m tall. A 32 mm high image of the tree on the film is needed
The required distance, between the tree and the camera lens, to take the photograph is closest to A) 26 m. B) 27 m. C) 24 m. D) 25 m. E) 29 m.
What eventually halts the gravitational collapse of an interstellar gas cloud that forms a brown dwarf rather than a true (main-sequence) star?
A) The central object becoming hot enough to sustain nuclear fusion in its core B) Degeneracy pressure caused by the high density of electrons in the core C) Thermal pressure from the high core temperature D) The onset of convection in the object's outer layers
Glass in a florist's greenhouse acts as a one-way valve in that it
A) lets light energy flow only in one direction. B) cuts off unwanted radiation. C) allows high-frequency waves in and blocks low-frequency waves exiting. D) is transparent only to lower-frequency waves.