An early model of the atom, proposed by Rutherford after his discovery of the atomic nucleus, had a positive point charge +Ze+Ze (the nucleus) at the center of a sphere of radius RR with uniformly distributed negative charge −Ze−Ze. ZZ is the atomic number, the number of protons in the nucleus and the number of electrons in the negative sphere.a. Show that the electric field inside this atom is:Em= Ze/4πeo (1/r²- r/R³) b. What is Eat the surface of the atom? Is this the expected value? Explain. c. A uranium atom has Z=92 and R: 0.10 nm. What is the electric field strength at r=1/2R.
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Ответ:
C. Tension
Explanation:
The tension in the cord occurs because of the muscle power of Daryl, who lifts the brick. While doing so, Daryl needs to overcome the gravitational pull on the brick.
EXTRA:
If the brick was much heavier, than Daryl's muscles would not be able to overcome the the gravitational pull on that brick, and then the much heavier brick would remain stationary on the ground, despite the efforts made by Daryl.