Which three characteristics of an object are represented by a motion map?
A. velocity, length, time
B. acceleration, time, mass
C. mass, length, position
D. position, acceleration, velocity
Ans: D. position, acceleration, velocity
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Among these choices, which is the first thing that happens in thehistory of the universe?
a) formation of nuclei of helium b) binding of electrons to nuclei c) first stars form d) universe becomes transparent e) first supernova explosions occur
A terrestrial telescope has focal lengths of 15. mm, 7.5 cm, and 120. cm for eyepiece, erecting lens, and objective respectively
(a) What is the magnification of the telescope? (b) Is this an angular magnification or a lateral size magnification? (c) What is its length (objective to eyepiece distance)?
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
The nucleus makes up about what percentage of the mass of an atom?
a. 99.9% b. 50% c. 90% d. 5%