Electromagnetic waves are longitudinal
Indicate whether the statement is true or false
FALSE
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A compass needle is a magnet with a north and south pole. If a tiny compass were placed in the magnetic field shown in the figure, how would the compass needle aligned in the magnetic field?
a. The needle would line up with a magnetic field line with the compass needle pointing in the same direction as the arrows in the diagram. b. The needle would line up with a magnetic field line with the compass needle pointing in the opposite direction to the arrows in the diagram. c. The compass needle always aligns perpendicular to the magnetic field lines. d. The north pole of the compass will point directly at the north pole of the magnet, regardless of the field lines. e. The north pole of the compass will point directly away from the north pole of the magnet, regardless of the field lines.
Like the RR Lyrae stars, Cepheids are all similar in luminosity, hence their use in measuring stellar distances
Indicate whether the statement is true or false
Which sequence of formation by age is correct, oldest to youngest?
A) Dark nebulae, planetary nebulae, emission nebulae B) Spiral arms, bulge, halo C) Halo, spiral arms, globular clusters D) Globular clusters, emission nebulae, open clusters
A 340-g air track cart traveling at 1.25 m/s suddenly collides elastically with a stationary 300-g cart. What is the speed of the 300-g cart just after the collision?
A) 0.0781 m/s B) 1.33 m/s C) 0.625 m/s D) 1.25 m/s E) 0.664 m/s