Answer:
axis=0 (or axis='rows' is horizontal axis. axis=1 (or axis='columns') is vertical axis. To take it further, if you use pandas method drop, to remove columns or rows, if you specify axis=1 you will be removing columns.
Explanation:
Answer:
a) ![\mu_s=0.65](https://tex.z-dn.net/?f=%5Cmu_s%3D0.65)
b) ![\mu_k=0.54](https://tex.z-dn.net/?f=%5Cmu_k%3D0.54)
Explanation:
Static friction is when the body is at rest or is about to move while kinetic friction is when the body is already in motion. According to Newton's second law:
![\sum F_y:N=mg\\\sum F_x:F_f=F_x](https://tex.z-dn.net/?f=%5Csum%20F_y%3AN%3Dmg%5C%5C%5Csum%20F_x%3AF_f%3DF_x)
a) In this case, the static friction must be equal to the horizontal force to set the clock in motion:
![F_f=\mu_sN=\mu_smg\\\mu_smg=F_x\\\mu_s=\frac{F_x}{mg}\\\mu_s=\frac{670}{106kg(9.8\frac{m}{s^2})}\\\mu_s=0.65](https://tex.z-dn.net/?f=F_f%3D%5Cmu_sN%3D%5Cmu_smg%5C%5C%5Cmu_smg%3DF_x%5C%5C%5Cmu_s%3D%5Cfrac%7BF_x%7D%7Bmg%7D%5C%5C%5Cmu_s%3D%5Cfrac%7B670%7D%7B106kg%289.8%5Cfrac%7Bm%7D%7Bs%5E2%7D%29%7D%5C%5C%5Cmu_s%3D0.65)
b) In this case, the kinetic friction is equal to the horizontal force that keep the clock moving with constant velocity:
![\mu_kmg=F_x'\\\mu_k=\frac{F_x'}{mg}\\\mu_k=\frac{557}{106kg(9.8\frac{m}{s^2})}\\\mu_k=0.54](https://tex.z-dn.net/?f=%5Cmu_kmg%3DF_x%27%5C%5C%5Cmu_k%3D%5Cfrac%7BF_x%27%7D%7Bmg%7D%5C%5C%5Cmu_k%3D%5Cfrac%7B557%7D%7B106kg%289.8%5Cfrac%7Bm%7D%7Bs%5E2%7D%29%7D%5C%5C%5Cmu_k%3D0.54)
The correct choice is
Sunspots
Sunspots are dark patches that appear on the surface of sun. These sunspots are formed by the magnetic field lines comes from the inner portion of the surface. they appear dark because their temperature is much lower than the surrounding temperature. hence the correct choice is sunspots.
In an electric circuit, the free electrons are moving around. Since equal charges repel and opposite charges attract, the electrons move from the negatively charged to the positively charged pole of the voltage source.