A person with ARh- blood can receive blood from individuals with blood types that do not contain the anti-A antibody, anti-B antibody, or the Rh factor. The options are evaluated:
ARh- (D): Compatible, as it lacks A and B antigens and the Rh factor.
ORh- (C): Compatible, as it lacks A and B antigens and the Rh factor.
The other options have either A or B antigens, or the Rh factor, and are thus incompatible with ARh- blood.
A bob of heavy mass \(m\) is suspended by a light string of length \(l\). The bob is given a horizontal velocity \(v_0\) as shown in figure. If the string gets slack at some point P making an angle \( \theta \) from the horizontal, the ratio of the speed \(v\) of the bob at point P to its initial speed \(v_0\) is :