What are quadrangle maps and what governmental agency produces them?
Quadrangle maps show both the horizontal and vertical layout of the land. U.S.
Geological survey.
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Angular Momentum: A merry-go-round spins freely when Diego moves quickly to the center along a radius of the merry-go-round. As he does this, it is true to say that
A. the moment of inertia of the system decreases and the angular speed increases. B. the moment of inertia of the system decreases and the angular speed decreases. C. the moment of inertia of the system decreases and the angular speed remains the same. D. the moment of inertia of the system increases and the angular speed increases. E. the moment of inertia of the system increases and the angular speed decreases.
In the Lighthouse model:
A) pulsars are observable only if they lie in the galactic plane. B) pulsars are navigational devices created by interstellar navigators as discovered by Jocelyn Bell in 1967. C) all pulsars have their poles pointed directly at us or they would be not observable. D) if the beams sweeps across us, we can observe the pulse. E) the period of pulsation must speed up as the neutron star continues contracting.
Simple Harmonic Motion: If a pendulum makes 12 complete swings in 8.0 s, what are its (a) frequency and (b) period?
What will be an ideal response?
A 20-solar-mass star will stay on the main sequence for 10 million years, yet its iron core can exist for only a
A) day. B) week. C) month. D) year. E) century.