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Physics-

General

Easy

Question

Two blocks A & B with mass 4 kg and 6 kg respectively are connected by a stretched spring of negligible mass as in figure . When the two blocks are released simultaneously the initial acceleration of B is 1.5 m/s² westward . The acceleration of A is :

$1 m / s^{2}$ westward
$2.25 m / s^{2}$ eastward
$1 m / s^{2}$ eastward
$2.75 m / s^{2}$ westward

The correct answer is: $1 m divided by s to the power of 2 end exponent$ eastward

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In figure shown on the right, the mass of the trolley is 100 kg, and it can move without friction on the horizontal floor. Its length is 12m. The mass of the girl is 50 kg. Friction exists between the shoes of the girl and the trolley’s upper surface, with $mu$ = 1/3. The girl can run with a maximum speed = 9 m/s on the surface of the trolley, with respect to the surface. At t = 0 the girl starts running from rest to the right. The trolley was initially stationary.(g = $10 m divided by s to the power of 2 end exponent$ )

At a certain moment when the girl was accelerating, the earth frame acceleration of the trolley is found to be 1 m/s² At this moment, the friction force between the girl’s shoes and the trolley’s surface is

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The logic circuit shown below has the input waveforms ‘A’ and ‘B’ as shown. Pick out the correct output waveform

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Truth table for system of four NAND gates as shown in figure is :

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Which of the following truth tables is true?

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