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Which of the following statement is not correct for an object moving along a straight path in an accelerated motion?
(c) It always goes away from the earth
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A particle is moving in a circular path of radius r. The displacement after half a circle would be:
A particle is moving in a circular path of radius r. The displacement after half a circle would be: (c) 2 r
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You spill a bucket of soapy water on a marble floor accidentally. Would it make it easier or more difficult for you to walk on the floor? Why?
It would make it more difficult for us to walk on a soapy floor because layer of soap makes floor smooth. The coating of soapy water reduces the friction and...
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Write any two activities which require more than a bucket of water.
(i) Washing 10 clothes (ii) Irrigating a crop field
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Write any two activities which require less than one bucket of water.
(i) Brushing your teeth (ii) Washing a handkerchief
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Boojho took an empty plastic bottle, turned it upside down and dipped its open mouth into a bucket filled with water.
(i) Bubbles of air came out from the bottle. (ii) Some water entered the bottle.
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A car of mass M is moving on a horizontal circular path of radius r. At an instant its speed is u and is increasing at a rate α.
(b) The magnitude of the frictional force on the car is greater than mv2/r (c) The friction coefficient between the ground and the car is not less than α/g. Explanation: Since the circular...
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A beaker containing a liquid is kept inside a big closed jar. If the air inside the jar is continuously pumped out,
(b) decrease EXPLANATION: The pressure at the bottom of the liquid is the sum of atmospheric pressure and the pressure due to the height of the liquid. When the air inside the...
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The excess pressure inside a soap bubble is twice the excess pressure inside a second soap bubble.
The correct answer is (d) 0125. Explanation: Let the radius of the first soap bubble = r, Excess pressure inside P = 4S/r Let the radius of the second soap bubble = r' Excess pressure...
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All the planets move around the Sun in a (i) Circular path (ii) Rectangular path (iii) Elongated path
(iii) Elongated path
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