At 96°F the saturation density of air is 0.04 kg/m3 . If the weather report says the relative humidity is 90% when the temperature is 96°F, the humidity is 0.036 kg/m3
Indicate whether the statement is true or false
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A mass oscillates on the end of a spring, both on Earth and on the Moon. Where is the period the greatest?
A) Earth B) the Moon C) the same on both Earth and the Moon D) Cannot be determined from the information given.
It was the Chinese who provided critical ancient data on supernovae and comets
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Two point charges of + 40.0 ?C and - 10.0 ?C are separated by a distance of 20.0 cm. A +7.00 ?C charge is placed midway between these two charges. What is the electric force acting on this charge because of the other two charges?
A) 0.453 N directed towards the negative charge B) 3.15 N directed towards the negative charge C) 3.15 N directed towards the positive charge D) 315 N directed towards the positive charge E) 315 N directed towards the negative charge
Bohr's model explains the absorption spectrum as the result of:
a. the specific jumps downward in energy that an electron has available in an unexcited atom. b. the specific jumps downward in energy that an electron has available in an unexcited atom. c. the specific jumps upward in energy that an electron has available in an unexcited atom. d. the specific jumps upward in energy that an electron has available in an excited atom. e. how an electron sometimes absorbs a photon when dropping to a lower level instead of emitting one.