After one _______________. of 18 years 11 1/3 days, the pattern of eclipses repeats
Fill in the blank(s) with correct word
Saros cycle
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An object attached to one end of a string moves in a circle at constant speed. Which of the following is correct?
A. the object is accelerating as it moves B. the object's velocity is the same as its speed C. the object does not require a force to keep its state of circular motion D. if the string breaks, the object will keep its circular motion E. If the string breaks, the object will move Radially away from the center of the cicl
A cubic box has sides of length 8.0 cm. What is the maximum number of pulverized spherical balls of diameter 1.5 cm that can fit inside the closed box (Vsphere = 4/3 ?r3)?
What will be an ideal response?
For which of the following does the Bohr model give good results?
1.the energy of the photons in the Balmer series 2.the filling of the electron shells 3.the splitting of the spectral lines for a source in a magnetic field 4.the fine structure of spectral lines
Which of these statements is true for the image formed by an object placed in front of a thin lens?
A. convex lenses never produce virtual images B. real images are always enlarged C. real images are always inverted D. virtual images are always inverted