You wish to drill a hole through a horizontal I-beam supporting a bridge. To weaken the beam the least drill the hole through the
A) upper flange.
B) lower flange.
C) web.
D) all the same
Answer: C
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Which of the following statements comparing open and globular star clusters is true?
A) Stars in open clusters are relatively young, while stars in globular clusters are very old. B) Open clusters are found both in the disk and the halo of the galaxy, while globular clusters are found only in the halo. C) Globular clusters typically contain a few hundred stars, while open clusters typically contain tens to hundreds of thousands of stars. D) Open clusters contain only main-sequence stars, while globular clusters contain only giants.
Each diagram shows five star circles. Look at the first circle to the north of the celestial equator on each diagram. Can you characterize the declination of stars on this circle? If so, what is it? Can you characterize the right ascension of stars on this circle? If so, what is it?
What will be an ideal response?
This photo shows the diffraction pattern in the shadow of a penny. If light bends around the edges of a penny to produce a bright spot exactly at the center, why are there no bright spots in places other than the center?
a. There are additional spots, but the one in the center is brightest. b. The penny acts like a lens and the bright spot is simply a tiny image of the penny. c. The center is equidistant from all parts of the penny's edge, therefore waves arrive "in step" at the center to add and produce a bright spot, but arrive out of step and cancel elsewhere. d. Superposition and interference of waves from the light occurs only at the center. e. The bright spot is merely an optical illusion.
A solid sphere is rolling without slipping along a horizontal surface with a speed of 4.50 m/s when it starts up a ramp that makes an angle of 25.0° with the horizontal
What is the speed of the sphere after it has rolled 3.00 m up the ramp? A) 4.01 m/s B) 8.02 m/s C) 1.91 m/s D) 2.16 m/s E) 1.58 m/s