Which of the following sources is likely to provide the most reliable scientific
information about a new kind of motor oil?
O
A. A news article that explains how the motor oil is designed
O
B. The website of the company that sells the motor oil
O
c. A newspaper ad for the motor oil
O
D. A peer-reviewed article about the effectiveness of the motor oil

During the experiment if you could triple the breakaway magnetic force with all other quantities left unchanged, what is the new value for the critical velocity if it was v0 (initial velocity), initially? (b) now if you halved the radius with all other quantities left unchanged, what is the new critical velocity if it was v0 (initial velocity), initially? (c) if during the experiment, critical velocity quadrupled with all other quantities left unchanged, what is the new breakaway force if its magnitude was initially f0,?