Atomic Nucleus: The primary reason that very large nuclei are unstable is due to
A. the cumulative repulsive force of the protons.
B. the cumulative attractive force between the protons and the orbiting electrons.
C. the repulsive force between the neutrons and the protons.
D. the extreme weakness of the gravitational attraction of the protons.
Answer: A
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(a) Compare the linear atom density of the [100] and [111] directions in the BCC metal iron, with a lattice parameter of 0.286 nm. (b) Which is the most closely packed direction in the BCC structure? (c) What is the radius of an iron atom if it is assumed that the atoms touch along the most closely packed direction?
Which of the following is fundamentally different from the others?
A) sound waves B) X-rays C) gamma rays D) light waves E) radio waves
shown. Inside the glass, the laser beam will take path nair = 1.000, nglass = 1.50
A. 1
B. 2
C. 3
A string attached to an airborne kite is maintained at an angle of 44.0° with the horizontal. If a total of 160 m of string is reeled in while bringing the kite back to the ground, what is the horizontal displacement of the kite in the process? (Assume the kite string doesn't sag.)
a. 111 m b. 80.0 m c. 31.7 m d. 115 m e. 155 m