Tense

In a laboratory five convex tenses L_1, L_2, L_3, L_4 and L_5 of focal lengths, 3 cm, 6 cm, 9 cm, 12 cm and 18 cm respectively are available. If two of these lenses form a telescope of length 12 cm and magnifying power 3, then objective and eye piece lenses respectively are

A heavy disc with radius R is rolling down hanging on two non-stretched string wound around the disc very tightly. The free ends of the string are attached to a fixed horizontal support. The strings are always tensed during the motion. At some instant, the angular velocity of the disc is omega , and the angle between the strings is alpha . Find the velocity of centre of mass of the disc at this moment

Given below are assertion and reason. Point out if both are true with reason being correct explanation (A), Both are true but reason is not correct expalantion (B), assertion is true but reason is wrong ( C), and both are wrong (D). Assertion. Dope test is used ot estimate level of blood alcohol by analysing breath of persons drinking alcohol. Reason. A drunken person usually feels tense and is less talkative

Two factories decided to award their employees for three values of (a) adaptable to new techniques, (b) careful and alert in difficult situations and (c) keeping calm in tense situations, at the rate of Rs x ,\ y\ a n d\ z per person respectively. The first factory decided to honour respectively 2, 4 and 3 employees with a total prize money of Rs 29000. The second factory decided to honour respectively 5, 2 and 3 employees with the prize money of Rs 30500. If the three prizes per person together cost Rs 9500, then represent the above situation by a matrix equation and form linear equations using matrix multiplication. Solve these equations using matrices. (iii) Which values are reflected in the questions?