In which type of radioactive decay does the atomic number of the parent nucleus change?
A) the atomic number changes in all three types of decay
B) electron capture
C) beta decay
D) alpha decay
A
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Friction: A bulldozer attempts to drag a log weighing 500 N along the rough horizontal ground. The cable attached to the log makes an angle of 30° above the ground. The coefficient of static friction between the log and the ground is 0.50, and the coefficient of kinetic friction is 0.35. What minimum tension is required in the cable in order for the log to begin to slide?
Fill in the blank(s) with the appropriate word(s).
Estimate the mass diffusivity of methane into air at 300 K, assuming ideal gas behavior.
What will be an ideal response?
The Sun is what spectral type?
a. S2 b. G2 c. F2 d. K2 e. ST2 (Spectral Type 2)
These objects are no longer considered a good explanation for the dark matter in the halo
A) WIMPs B) MACHOs C) black holes D) clouds of cool, neutral hydrogen E) brown dwarfs