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°.
c
Physics & Space Science
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Comets are composed of ____
a. rock and dust b. rock and metals c. ice and metals d. ice and dust e. rock and gas
Physics & Space Science
The attraction of a person's body toward Earth is called weight. The reaction to this force is
A) the person's body pushing against Earth's surface. B) Earth's surface pushing against the person's body. C) the person's body pulling on Earth. D) none of the above
Physics & Space Science
The observations of sunspots on the Sun and craters on the Moon by Galileo contradicted the commonly held belief that the universe was
A) spherical B) unchanging C) infinite D) perfect
Physics & Space Science
In both fission and fusion, mass
A) is created from energy of other forms. B) converts to kinetic energy. C) converts to gamma radiation. D) remains the same.
Physics & Space Science