In the Lawson number what do the n and stand for?
a. ion density, critical ignition temperature
b. ion density, confinement time
c. neutrino density, confinement time
d. ion density, critical ignition temperature
e. neutrino density, reaction mean life
b
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Compound Microscope: A microscope has an objective lens of focal length 1.40 mm and an eyepiece of focal length 20.00 mm. It is adjusted for minimum eyestrain for persons with a near point of 25.0 cm. A blood sample is placed 1.50 mm from the objective. How far apart are the lenses?
A. 20 mm B. 21 mm C. 23 mm D. 41 mm
If the Moon rises around 3 A.M., its phase must be
A) full. B) first quarter. C) third quarter. D) waning crescent. E) waxing crescent.
A 3.0-kg block slides on a rough horizontal surface. A force of 8.0 N acting parallel to the surface is applied to the block. The coefficient of kinetic friction between the block and the surface is 0.15 . What is the magnitude of the block's acceleration?
a. 1.9 m/s2 b. 1.2 m/s2 c. 2.3 m/s2 d. 1.5 m/s2 e. 2.9 m/s2
The statement, "There are regions beneath the Earth's crust that will always be beyond the reach of scientific investigation," is
A) a fact. B) speculation. C) a scientific statement. D) a theory.