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Arsh01
@arsh01
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Joined: Dec 24, 2020
Last seen: Jan 25, 2021
Topics: 0 / Replies: 2028
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Answer to: The cork floats while the nail sinks in the water, this is due to

(c) density of cork is less than the density of water.

5 years ago
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Answer to: Why is it difficult to hold a school bag having a strap made of a thin and strong string?

The force exerted by a thin and strong string is distributed to very less area and hence the force applied due to the bag is more, the pressure exerte...

5 years ago
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Answer to: The volume of 500 g sealed packet is 350 cm^3. Will the packet float or sink in water if the density of water is 1 g cm^-3? What will be the mass of the water displaced by this packet?

Here, mass of packet, M – 500 g volume of the packet, V = 350 cm3 Clearly, density of packet, d = = = Since the density of packet is more than ...

5 years ago
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Answer to: The volume of 50 g of a substance is 20 cm^3. If the density of water is 1 g cm^-3, will the substance float or sink?

Density of water, dw = 1 g cm-3 Mass of substance, m = 50 g Volume of substance, V = 20 cm3 ∴ Density of substance = = 2.5 g cm-3 As th...

5 years ago
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Answer to: Why does a block of plastic released under water come up to the surface of water?

The buoyant force acting on the block of plastic is more than its weight. As a result of this, it comes up when released under water. The cause of t...

5 years ago
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Answer to: In what direction does the buoyant force on an object immersed in a liquid act?

If an object is immersed in a liquid then the buoyant force due to liquid acts on the object in vertically upward direction.

5 years ago
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Answer to: A ball thrown up vertically returns to the thrower after 6 s. Find (a) the velocity with which it was thrown up, (b) the maximum height it reaches, and (c) its position after 4 s.

Here, time of ascent = time of descent, = 3s (a) v = 0, a = -g = -9.8 m/s2 From v = u + gt 0 = u - 9.8 x 3 u = 29.4 m/s (b) From v2 - u2 ...

5 years ago
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Answer to: A stone is released from the top of a tower of height 19.6 m. Calculate its final velocity just before touching the ground.

Initial velocity, u = 0 ms-1 Final velocity, v = ? Height of the tower, h = 19.6 m Acceleration due to gravity, g = 9.8 ms-2 Using the equatio...

5 years ago
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Answer to: A ball is thrown vertically upwards with a velocity of 49 m/s. Calculate (i) the maximum height to which it rises, (ii) the total time it takes to return to the surface of the earth.

Initial velocity, u = 49 m/s Acceleration, a = g = -9.8 m/s2 Velocity at the highest point, v = 0 m/s (i) If h is the maximum height reached by ...

5 years ago
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Answer to: Gravitational force on the surface of the moon is only 1 as strong as gravitational force on 6 the earth. What is the weight in newtons of a 10 kg object on the moon and on the earth?

Here, m = 10 kg Mass is the same on earth and moon. Now, weight of the object on earth, We, = mge = 10 × 9.8 = 98 N Weight of the object on mo...

5 years ago
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Answer to: Why will a sheet of paper fall slower than one that is crumpled into a ball?

A sheet of paper will fall slower than the one that is crumpled into a ball. This is because the air offers resistance due to friction to the motion o...

5 years ago
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Answer to: Amit buys few grams of gold at the poles as per the instruction of one of his friends. He hands over the same when he meets him at the equator. Will the friend agree with the weight of gold bought? If not, why?

We know that the value of g is greater at the poles than at the equator. So the weight of gold at the equator will be less than the weight of gold at ...

5 years ago
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