USB cooling fan simple life hacks

Two beaker contain hot water of the same temperature one beaker is placed in anotehr beaker containing cold water and the other breaker in fornt of a rotating fan .It is observed that the beaker placed infront fan cools faster .explain the reason

A USB communication device that supports encryption for secure wireless communication for notebook users is called

A dealer wishes to purchase table fans and ceiling fans. He has Rs. 57,600 to invest, and has space to store 40 items. A table fan costs Rs. 750 and ceiling fan costs Rs. 900. He can make profits of Rs. 70 and Rs. 90 by selling a table fan and a ceiling fan respectively. If dealer sell all the fans that he buy, the formulate this problem as LPP, to maximize the profit.

The angular displacement (theta) of the blades of a ceiling fan, when the fan is switched on at t=0, is shown in figure. The average angular velocity of the fan blades during the first 8 seconds will be

The angular displacement( theta ) of the blades of a ceiling fan, when the fan is switched on at t=0 , is shown in figure. The average angular velocity of the fan blades during the first 8 seconds will be

Which of the following is not a part of a hack saw ?

What are the three frequencies in an amplitude modulated wave? What are LSB and USB?

A company markets a particular brand of electrical fans.The life of fans (in months) is give the following distribution.Determine the modal class and median class.Age(in months) 0-66-1212-1818-2424-3030-3636-4242-48 No.of fans 6.1520252540321820