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Say yes or No: a. Can an object moving towards north have acceleration towards south? b. Can an object reverse the direction of its motion even though it has constant acceleration
17
Sep
Say yes or No: a. Can an object moving towards north have acceleration towards south? b. Can an object reverse the direction of its motion even though it has constant acceleration Say yes or No: a. Can an object moving towards north have acceleration towards south? b. Can an object reverse the direction of its [...]
a. If the velocity of a body is zero, does it mean that its acceleration is also zero? (yes/no) b. If the acceleration of a body is zero, does it mean that its velocity is also zero? (yes/no)
17
Sep
a. If the velocity of a body is zero, does it mean that its acceleration is also zero? (yes/no) b. If the acceleration of a body is zero, does it mean that its velocity is also zero? (yes/no) a. If the velocity of a body is zero does it mean that its acceleration is also [...]
A raft of wood of mass 120 kg floats in water. The weight that can be put on the raft to make it just sink should be (d raft = 600 kg / m^3
17
Sep
A raft of wood of mass 120 kg floats in water. The weight that can be put on the raft to make it just sink should be (d raft = 600 kg / m^3 A raft of wood of mass 120 kg floats in water. The weight that can be put on the raft to [...]
Two cylinders of same cross-section and length L but made of two different materials of densities d1 and d2 are connected together to from a cylinder of length 2L. The combination floats in a liquid of density d with a length L/2 above the surface of the liquid.If d1
17
Sep
Two cylinders of same cross-section and length L but made of two different materials of densities d1 and d2 are connected together to from a cylinder of length 2L. The combination floats in a liquid of density d with a length L/2 above the surface of the liquid.If d1 Upthrust will remain same September 17, [...]
Two vectors A and B lie in one plane. Vector C lies in a different plane. Then, A + B + C a. Cannot be zero b. can be zero c. Lies in the plane of A or B
17
Sep
Two vectors A and B lie in one plane. Vector C lies in a different plane. Then, A + B + C a. Cannot be zero b. can be zero c. Lies in the plane of A or B A + B + C a. Cannot be zero b. can be zero c. Lies in [...]
If v1 + v2 is perpendicular to v1 – v2 then a. v1 is perpendicular to v2 c b. v1 = v2 c. v1 is a null vector
17
Sep
If v1 + v2 is perpendicular to v1 – v2 then a. v1 is perpendicular to v2 c b. v1 = v2 c. v1 is a null vector If v1 + v2 is perpendicular to v1 - v2 then a. v1 is perpendicular to v2 c b. v1 = v2 c. v1 is a null [...]
A piece of steel has a weight w in air, w1 when completely immersed in water and w2 when completely immersed in an unknown liquid. The relative density (specific gravity) of liquid is
17
Sep
A piece of steel has a weight w in air, w1 when completely immersed in water and w2 when completely immersed in an unknown liquid. The relative density (specific gravity) of liquid is A piece of steel has a weight w in air w1 when completely immersed in water and w2 when completely immersed in [...]
A pump is designed as a horizontal cylinder with a piston of areal A and and outlet orifice of area A arranged near the cylinder axis. Find the velocity of out flow of the liquid from the pump if the piston moves with a constant velocity under the action of a constant force F. The density of the liquid is ρ.
17
Sep
A pump is designed as a horizontal cylinder with a piston of areal A and and outlet orifice of area A arranged near the cylinder axis. Find the velocity of out flow of the liquid from the pump if the piston moves with a constant velocity under the action of a constant force F. The [...]
The volume of an air bubble becomes three times as it rises from the bottom of a lake to its surface. Assuming atmospheric pressure to be 75 cm of Hg and the density of water to be 1/10 of the density of mercury, the depth of the lake.
17
Sep
The volume of an air bubble becomes three times as it rises from the bottom of a lake to its surface. Assuming atmospheric pressure to be 75 cm of Hg and the density of water to be 1/10 of the density of mercury, the depth of the lake. Upthrust will remain same September 17, 2020 [...]
A metal ball immersed in alcohol weights W1 at 0∘C and W2 at 50∘C. The coefficient of expansion of cubical the metal is less than that of the alcohol. Assuming that the density of the metal is large compared to that of alcohol, it can be shown that
17
Sep
A metal ball immersed in alcohol weights W1 at 0∘C and W2 at 50∘C. The coefficient of expansion of cubical the metal is less than that of the alcohol. Assuming that the density of the metal is large compared to that of alcohol, it can be shown that Upthrust will remain same September 17, 2020 [...]