Bones show up in x ray images because they absorb x rays more efficiently than muscle and other tissues do
Indicate whether the statement is true or false
T
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Uranus' orbital period is 84 years. How far is Uranus from the sun?
What will be an ideal response?
Equilibrium: A stepladder consists of two halves that are hinged at the top and connected by a tie rod which keeps the two halves from spreading apart. In this particular instance, the two halves are 2.5 m long, the tie rod is connected to the center of each half and is 70 cm long. An 800-N person stands 3/5 of the way up the stepladder, as shown in the figure. The ladder is light enough that we can neglect its weight, and it rests on an extremely smooth floor. What is the tension in the tie rod? (Note: To solve this problem, it is helpful to imagine cutting the ladder in half vertically and consider the forces and torques acting on each half of the ladder.)
width="398" /> A. 140 N B. 240 N C. 280 N D. 360 N E. 560 N
Star X is a supergiant of spectral type M. Star Y is a giant but of identical spectral type M. What can you conclude?
A) Star X is more luminous and larger in radius than star Y. B) Star Y is more luminous and larger in radius than star X. C) Star X is hotter than star Y. D) Star Y is hotter than star X.
Which of the following correctly lists the various parts of the electromagnetic spectrum in the correct order from lowest to highest energy.
A. infrared, ultraviolet, radio waves, gamma rays, visible B. gamma rays, infrared, ultraviolet, radio waves, visible C. radio waves, ultraviolet, visible, infrared, gamma rays D. gamma rays, ultraviolet, visible, infrared, radio waves E. radio waves, infrared, visible, ultraviolet, gamma rays