Before it arrived in orbit about Eros, the NEAR spacecraft also flew past:
A) Venus.
B) asteroid Mathilde.
C) Comet Wild.
D) Mars.
E) Comet Halley.
B
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Which of the following statements is not true of the object known as Sgr A* in the center of our Galaxy?
A) It is by far the brightest source of visible light lying in the direction of the galactic center. B) It is thought to harbor a black hole of about 4 million solar masses. C) It is a source of x-ray emission that we have observed with telescopes in space. D) It is a source of bright radio emission.
What is the escape speed from a planet of mass m and radius r if m = 3.2 × 1023 kg and r = 2.4 × 106 m?
A. 5.5 km/s B. 4.2 km/s C. 5.2 km/s D. 4.8 km/s E. 3.7 km/s
A charge of 10 nC is distributed uniformly along the x axis from x = ?2 m to x = +3 m. Which of the following integrals is correct for the electric potential (relative to zero at infinity) at the point x = +5 m on the x axis?
A.
B.
C.
D.
E.
Which one of the arrows below most closely indicates the direction of the bob’s acceleration when it is at point 3?
A. A
B. B
D. D
E. E
F. F