Studies from ________ led to the discovery of "dark energy."
A) Type II supernovae in the Large Magellanic Cloud
B) Cepheid variables in the Virgo Cluster
C) the COBE microwave ripples
D) the gravitational lensing by MACHOs
E) Type I supernovae at very large redshifts
E
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Wave Characteristics: An FM radio station broadcasts at 96.7 MHz. What is the wavelength of the radio wave used for this broadcast? (c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).
Mary passes Mike from behind while bicycling. As she passes him,
A) the two have different speeds and different velocities. B) the two have the same speeds and the same velocities. C) Mike turns into a hippopotamus. D) the two have the same speeds but different velocities. E) the two have different speeds but the same velocities.
A heavy boy and a lightweight girl are balanced on a massless seesaw
If they both move forward so that they are one-half their original distance from the pivot point, what will happen to the seesaw? Assume that both people are small enough compared to the length of the seesaw to be thought of as point masses. A) It is impossible to say without knowing the masses. B) It is impossible to say without knowing the distances. C) The side the boy is sitting on will tilt downward. D) Nothing will happen; the seesaw will still be balanced. E) The side the girl is sitting on will tilt downward.
If the outside air pressure decreases, the reading on a tire gauge connected to a tire __________
Fill in the blank(s) with correct word