A typical supercluster contains no more than about 10,000 stars
Indicate whether the statement is true or false
FALSE
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A 3.0-kg mass sliding on a frictionless surface has a velocity of 5.0 m/s east when it undergoes a one-dimensional inelastic collision with a 2.0-kg mass that has an initial velocity of 2.0 m/s west. After the collision the 3.0-kg mass has a velocity of 1.0 m/s east. How much kinetic energy does the two-mass system lose during the collision?
a. 22 J b. 24 J c. 26 J d. 20 J e. 28 J
Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface. A light ray that reflects from mirror 1 at angle ?M 1 then strikes the second mirror and reflects at ?M 2 such that the angle between the ray reaching mirror 1 and the ray leaving mirror 2 is 180°. The angle between the two mirrors is a. 0°
b. 45°. c. 90°. d. 150°. e. 235°.
What holds the nucleus together?
a. electrical forces between the protons b. alpha particles c. beta particles d. strong forces
The crustal surface varies in
A) composition, density, and thickness. B) isostasy, density, and rock competence. C) thickness—the oceanic crust is thinner than the continental crust. D) density—the oceanic crust is heavier than the continental crust.