Far infrared astronomy must be done from high-flying aircraft because
a. far infrared radiation is absorbed low in Earth's atmosphere.
b. far infrared photons are quite energetic.
c. far infrared telescopes are not very heavy.
d. far infrared sources are very bright.
e. None of the other choices are correct.
a
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A wheel rotating about a fixed axis has a constant angular acceleration of 4.0 rad/s2 . In a 4.0-s interval the wheel turns through an angle of 80 radians. Assuming the wheel started from rest, how long had it been in motion at the start of the 4.0-s interval?
a. 2.5 s b. 4.0 s c. 3.5 s d. 3.0 s e. 4.5 s
The oldest parts of Earth's crust are located along the midocean rifts
Indicate whether the statement is true or false
Point charges of equal magnitudes (25 nC) and opposite signs are placed on (diagonally) opposite corners of a 60-cm × 80-cm rectangle. If point A is the corner of this rectangle nearest the positive charge and point B is located at the intersection of the diagonals of the rectangle, determine the potential difference, VB ? VA
a. ?47 V b. +94 V c. zero d. ?94 V e. +47 V
Extraterrestrial life is defined to be
A) life found beyond the Earth which is based on the same biology and chemistry as life on Earth B) advanced life forms that have visited the Earth C) any kind of life found beyond the Earth D) advanced life found on Earth-like planets around other stars