A hydrocarbon \( C_n H_m \) is burnt in air (O\(_2\) + 3.78N\(_2\)). The stoichiometric fuel to air mass ratio for this process is
Note: Atomic Weight: C(12), H(1) Effective Molecular Weight: Air(28.8)
Group-I | Group-II | ||
P | Trilobite | 1 | Periproct |
Q | Brachiopod | 2 | Hypostome |
R | Bivalve | 3 | Deltidial plate |
S | Echinoid | 4 | Lunule |
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 :