Solid wooden sphere rolls down two different inclined planes of the same height but of different inclinations.
(a) Will it reach the bottom with same speed in each case ?
(b) Will it take longer to roll down one inclined plane than other ? Explain
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A boy rolls a rubber ball on a wooden surface. The ball travels a short distance before coming to rest.
(c) sprinkle talcum powder on the wooden surface.
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Will force of friction come into play when a rain drop rolls down a glass window pane?
The correct answer is : Yes.
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A marble is allowed to roll down an inclined plane from a fixed height. At the foot of the inclined plane,
On the surface covered with sand, it will cover the least distance because sand offers maximum friction against its motion.
1 Answers 1 views
Two identical solid balls, one of ivory and the other of wet-clay, are dropped from the same height on the floor
As the ivory ball is more elastic than the wet-clay ball, it will tend to retain its shape instantaneously after the collision. Hence, there will be a large energy and...
1 Answers 1 views
Why does a solid sphere have smaller moment of inertia than a hollow cylinder of same mass and radius,
I = Σmiri2. All the mass in a cylinder lies at distance R from theaxis of symmetry but most of the mass of a solid sphere lies at a smaller distance...
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What do you understand about the author’s literary inclinations from the account?
The writer was a prose-writer. He wanted to send a short story for the short story contest organized by a British periodical by the name 'The Encounter'.
1 Answers 5 views
Should the speed of two artificial satellites of the earth having different masses but the same orbital radius, be the same?
Yes it is so because the orbital speed of a satellite is independent of the mass of a satellite. Therefore the speeds of the artificial satellite will be of different...
1 Answers 1 views
If the radius of a sphere is doubled, what is the ratio of the volume of the first sphere to that of the second sphere?
Volume of first sphere = 4×r³×π / 3 = V₁ Volume of second sphere = 4×(2r)³×π / 3 = 4×8r³×π / 3 = V₂ Ratio = V₁ / V₂ = (4×r³×π /...
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If two solid hemispheres of same base radius r are joined together along their bases, then curved surface area of this new solid is
The correct option is (a) 4πr2. Explanation: Because curved surface area of a hemisphere is 2 w2 and here, we join two solid hemispheres along their bases of radius r, from which...
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A solid cylinder of radius r and height h is placed over other cylinder of same height and radius.
Solution: False Since, the total surface area of cylinder of radius, rand height, h = 2πrh + 2πr2 When one cylinder is placed over the other cylinder of same height and radius, then height...
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