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Let the distance be x km. Speed upstream = 7 – 5 = 2 kmph Speed downstream = 7 + 5 = 12 kmph => (x/12) + (x/2) = 7 => (x + 6x)/12 = 7 => 7x = 84 => x = 12 km
The pitch of a sound is primarily determined by which of the following?
An object initially at rest explodes into several fragments. If no external forces act during the explosion, the center of mass of the fragments will:
The half-life of a radioactive substance is 10 days. The time in which only 1/8th of the original substance remains is:
Total mechanical energy =
A wire loop in the shape of a square of side a carries a current I. If an infinitely long straight wire carrying the same current passes through the ...
A particle dropped from the top of a tower uniformly falls on ground at a distance which is equal to the height of tower. Which of the following paths ...
Which of the following is not a characteristic of simple harmonic motion (SHM)?
Which of the following is the SI unit of electric charge?
A conducting rod of length 0.2 m is rotated with angular velocity 10 rad/s about one end in a uniform magnetic field of 0.5 T perpendicular to the plane...
Which of the following quantities is a scalar?