Assume you are not near any X-ray machines. If your eyes could only see in X-rays, what color would best describe your view of your surroundings?
a. white b. red
c. violet d. black
d
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How can the Doppler method be used to estimate the average orbital distance of a planet's orbit?
A) by measuring the speed at which the star orbits the mutual center-of-mass of the star and planet, and using Newton's theory of gravity B) by measuring the time it takes for the star's line-of-sight velocity to cycle from peak to peak, and using Newton's version of Kepler's Third law C) by measuring the asymmetries in the velocity curve D) by measuring the amount by which the starlight is reduced when the planet transits
A 7.0-kg rock is subject to a variable force given by the equation
F(x) = 6.0 N - (2.0 N/m)x + (6.0 N/m2)x2 If the rock initially is at rest at the origin, find its speed when it has moved 9.0 m.
A reflected ray of light leaves a plane mirror's surface at an angle of 30° relative to the normal. The angle of incidence was
a. 30° relative to the surface. b. 60° relative to the normal. c. 90° from the surface. d. none of these.
There are rings around
• •(a) the terrestrial planets •(b) the Jovian planets