Which of the following statements about the concept of solid friction is NOT true?
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2003
In 90 seconds, the mass of a radioactive element reduces to \(\frac{1}{16}\) of its original value. Determine the half- life of the element.
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2003
A ball of mass m moving at velocity u collides with another ball of equal mass at rest. If the two balls move off together after the impact, calculate their common velocity.
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2003
A body is launched from the earth’s surface, of radius R, so that it just escapes from the gravitational influence of the earth; If the gravitational constant is G and the mass of the earth is M, what is the escape veloc…
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2003
The area under the curve of a velocity time graph represents
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2003
An evidence of the wave nature of matter is
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2003
Which of the following properties is NOT exhibited by sound waves?
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2003
An object is placed 30 cm in front of a concave mirror of focal length 20cm. Calculate the distance between the object and the image.
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2003
A sheet of white paper viewed through blue glass appears blue because
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2003
Which of the following statements is NOT true?
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2003
The volume of a given mass of gas is 40cm3 at 27° C. What is its volume at 90° C if its pressure remains constant?
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2003
Water in an open container boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of a mountain
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2003
J.J. Thomson’s model of the atom was abandoned because