Which stars in globular clusters are believed to be examples of mergers?
A) brown dwarfs
B) eclipsing binaries
C) blue stragglers
D) blue supergiants
E) planetary nebulae cores
C
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A Hooke's law spring is mounted horizontally over a frictionless surface. The spring is then compressed a distance d and is used to launch a mass m along the frictionless surface. What compression of the spring would result in the mass attaining double the kinetic energy received in the above situation?
a. 1.41d c. 2.00d b. 1.73d d. 4.00d
Geosynchronous satellites
a. have an orbital period of 24 hours. b. remain above a geographical point on Earth while Earth rotates underneath. c. have an orbital period of 24 hours and remain above a geographical point on Earth while Earth rotates underneath. d. None of the other choices are correct.
Small openings between leaves in a tree act as pinholes. The round spots of light cast on the ground below are images of
A) the Sun. B) the openings themselves. C) both of these D) neither of these
Consider a uniform horizontal electric field of 50 N/C directed toward the east. If the electric potential measured at a given point is 80 V, what is the potential at a point 1.0 m directly west of that point?
A) 30 V B) 50 V C) 80 V D) 130 V