Which of the following best describes a tooltip?
A. A help feature in a web design program.
B. A word or phrase used in a web search.
C. A small textbox that appears when you point to a link.
D. A suggestion for using a website or webpage.
Answer: C
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A negatively-charged particle is slowly moving as it enters a region that has a constant magnetic field. If the velocity of the particle is initially parallel to the magnetic field, what will be the subsequent motion of the particle?
a) It will follow a helical path around the magnetic field lines. b) It will follow a circular path in the plane perpendicular to the magnetic field lines. c) It will follow a straight line path in the same direction as it was initially traveling. d) It will follow a circular path in a plane parallel to the magnetic field lines. e) It is impossible to predict the path the particle will follow.
A uniform 120-lb beam is supported in a horizontal position by a pin and cable as shown in the figure. What is the magnitude of the force by the pin on the beam?
A. 94 lb B. 88 lb C. 63 lb D. 75 lb E. 150 lb
Imagine hitting a heavy anvil with a hammer. The hammer is in contact with the metal for a short period of time. How do you suppose the time of contact depends upon how hard you hit the anvil (i.e
, does a hard hit remain in contact much longer or shorter than a light tap?) [It is reasonable to assume Hooke's law of elasticity to hold.]
This photo shows an object located in the halo of our Milky Way galaxy. Notice the many bright red dots in the photograph. What are they?
A) red giant stars B) cool, red main-sequence stars of spectral type M C) old white dwarf stars that have turned red in color D) massive supergiant stars E) starspots