Entropy, in thermodynamics, is a measure of the degree of randomness or disorderliness of a system. It has units of energy per temperature. So, we calculate it by dividing the total heat in the system by the temperature. We do as follows:
Entropy = 437 J / 321 K = 1.36 J/K
Answer:
0.4cm
Explanation:
First, you calculate the dis acceleration of the electron generated by the potential difference between the plates:
(1)
q: charge of the electron = 1.6*10^-19 C
V: potential difference between plates = 100V
m: mass of the electron
d: distance between parallel plates = 1cm = 0.01m
by replacing the values of the parameters you obtain:
![a=\frac{(1.6*10^{-19C})(100V)}{(9.1*10^{-31})(0.01m)}=1.75*10^{15}\frac{m}{s^2}](https://tex.z-dn.net/?f=a%3D%5Cfrac%7B%281.6%2A10%5E%7B-19C%7D%29%28100V%29%7D%7B%289.1%2A10%5E%7B-31%7D%29%280.01m%29%7D%3D1.75%2A10%5E%7B15%7D%5Cfrac%7Bm%7D%7Bs%5E2%7D)
you use this value in the following kinematic equation:
(2)
v: final velocity = 0m/s (until the electron stops)
from the equation (2) you calculate x, the distance traveled by the electron. But before you calculate the initial velocity of the electron by using the following equation:
![K=10eV\\\\\frac{1}{2}mv_o^2=10eV\\\\v_o=\sqrt{\frac{2(10(1.602*10^{-19}J))}{9.1*10^{-31}kg}}\\\\v_o=1.87*10^6\frac{m}{s}](https://tex.z-dn.net/?f=K%3D10eV%5C%5C%5C%5C%5Cfrac%7B1%7D%7B2%7Dmv_o%5E2%3D10eV%5C%5C%5C%5Cv_o%3D%5Csqrt%7B%5Cfrac%7B2%2810%281.602%2A10%5E%7B-19%7DJ%29%29%7D%7B9.1%2A10%5E%7B-31%7Dkg%7D%7D%5C%5C%5C%5Cv_o%3D1.87%2A10%5E6%5Cfrac%7Bm%7D%7Bs%7D)
Next, you replace vo in (2) to obtain x:
![0=v_o^2-2ax\\\\x=\frac{v_o^2}{2a}=\frac{(1.87*10^6m/s)^2}{2(1.75*10^{15}m/s^2)}=0.001m=0.1cm](https://tex.z-dn.net/?f=0%3Dv_o%5E2-2ax%5C%5C%5C%5Cx%3D%5Cfrac%7Bv_o%5E2%7D%7B2a%7D%3D%5Cfrac%7B%281.87%2A10%5E6m%2Fs%29%5E2%7D%7B2%281.75%2A10%5E%7B15%7Dm%2Fs%5E2%29%7D%3D0.001m%3D0.1cm)
Then, the electron travels 0.1cm from the middle of the region between the parallel plates, hence, the distance between the electron and the negatve plate is:
0.5cm-0.1cm=0.4cm
I would say D. because you round to the nearest whole number and 0.04 is way less than 0.5 which is a good rounding up number.
Answer:
A light bulb lightning up
Explanation:
22.5 m/s
This is because the puck will not slow down, and maintain a constant velocity.