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ATQ, 12 employees and 2 managers went for the picnic which means that 20 employees and 4 managers did not go to the picnic. Total weight of 12 employees who went for picnic = 38 × 32 – 35 × 20 = 1216 – 700 = 516 kg Total weight of 2 managers who went for picnic = 62 × 6 – 61 × 4 = 128 kg Total weight of all the people who went for the picnic = 516 + 128 = 644 kg Required average = 644/14 = 46 kg
Speed of sound in air is unaffected by change in :
The instrument which uses sound waves to measure the depth of oceans is –
I threw a ball horizontally on the road and after covering certain distance, the ball stopped due to
The apparatus used in the refrigeration is
Which of the following is the time taken for one complete oscillation of a sound wave in the density of the medium?
Which of the following is the best fire-extinguisher?
Einstein was awarded Nobel Prize for –
The waves which are less than 20Hz are known as
Where is the gravitational acceleration zero?
In gymnastics, which event is performed on a large floor mat?