Globular cluster stars are ________ in heavy elements than those in open clusters
Fill in the blank(s) with correct word
poorer
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A solar or lunar eclipse may occur when the line of nodes (The line connecting the points of the Moon's orbit that intersects the plane of the Earth's orbit around the Sun)
a. points at the Sun. b. is 90 degrees to the Sun's direction. c. Wrong! The line of intersection is irrelevant.
A 100 kg football linebacker moving at 2 m/s tackles head-on an 80 kg halfback running 3 m/s. Neglecting the effects due to digging in of cleats
A) this is a simple example of an elastic collision. B) the linebacker will drive the halfback backward. C) neither player will drive the other backward. D) the halfback will drive the linebacker backward.
The speed of a comet in its orbit around the Sun is ______________ when its distance from the Sun is greatest (aphelion)
a. zero b. reversed c. greatest d. least
A muon is an unstable particle that has an average lifetime of 1.52 × 10-6 s
This is the time interval between its creation in a nuclear process and its extinction into decay products, as measured in a frame of reference at rest with respect to the muon. An "average" muon is observed by a scientist on Earth to travel 342 m in its lifetime. What is the speed of the muon relative to Earth? A) 0.821c B) 0.681c C) 0.601c D) 0.551c E) 0.335c