Contrast X-ray bursters with nova events
What will be an ideal response?
Both events are seen as a sudden brightening due to mass transfer onto a compact object, but for a nova, the material falls on a white dwarf, and the event is visual. For X-ray bursters, the target is a smaller neutron star, and the energy is X-rays instead of visible light.
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A circular orbit would have an eccentricity of:
A) 0. B) between 0 and 0.5. C) between 0.5 and 1. D) exactly 1.0. E) infinity.
Impulse: A super dart of mass 20 g, traveling at 350 m/s, strikes a steel plate at an angle of 30° with the plane of the plate, as shown in the figure. It bounces off the plate at the same angle but at a speed of 320 m/s. What is the magnitude of the impulse that the plate gives to the bullet?
A. 0.52 N ? s B. 4.3 N ? s C. 300 N ? s D. 6.7 N ? s E. 0.30 N ? s
Two identical particles, each with a mass of 2.0 mg and a charge of 25 nC, are released simultaneously from rest when the two are 4.0 cm apart. What is the speed of either particle at the instant when the two are separated by 10 cm?
a. 7.3 m/s b. 9.8 m/s c. 9.2 m/s d. 6.5 m/s e. 4.6 m/s
According to the nonlocality principle,
A) two particles can respond to each other instantaneously, no matter how far apart they are. B) each microscopic particle is always spread out over a large region of space. C) nature is inherently uncertain. D) forces such as gravity and the electromagnetic force can be felt even at a distance. E) two particles can always be in contact with each other by electromagnetic waves that travel at light velocity.