An asteroid has a perihelion (the orbit's closest approach to the Sun) of 2.5 AU and a period of revolution of 8.0 y. What is its greatest distance from the Sun (its aphelion)? (Hint: For an elliptical orbit, the effective radius of the orbit is half the sum of the nearest distance to the Sun and the greatest distance from the Sun.)
a. 8.0 AU
c. 5.5 AU
b. 6.5 AU
d. 2.5 AU
C
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A 60-vibration-per-second wave travels 30 meters in 1 second. Its frequency is
A) 30 hertz and it travels at 60 m/s. B) 60 hertz and it travels at 30 m/s. C) 1800 hertz and it travels at 2 m/s. D) none of the above
What do peculiar velocities reveal?
A) the amount of dark matter in a galaxy B) the distribution of dark matter in large-scale structures C) the composition of dark matter D) the error in our observations of Hubble's law E) the critical density of the universe
The diagram shown represents a portion of a wire in a circuit. A current is flowing in the wire in the direction shown. Under the convention that it is positive charge that flows the electric field points in the direction of the current. How can the electric field change direction where the wire bends?
A. There is an excess of negative charge in the center of the wire. B. There is an excess of positive charge at the bottom end of the wire. C. There is an excess of negative charge at the right end of the upper portion of the wire. D. There is an accumulation of positive charge on the surface, particularly at the bend, such that the sum of electric fields gives the new electric field. E. There is an accumulation of electrical potential as the current traverses the wire: The higher potential in the lower half is the source of the field.
An 825-kg space vehicle is circling Earth in a circular orbit with a radius of 10,300 km. Its orbit is to be changed to a larger circle with a radius of 17,400 km. How much energy is required to accomplish this?
The mass of Earth is 5.97 × 1024 kg and G = 6.67 × 10-11 N ? m2/kg2. A) 1.00 × 109 J B) 1.30 × 1010 J C) 6.51 × 109 J D) 4.45 × 109 J E) 4.50 × 1010 J