The process by which the heat energy is transmitted between the atoms or molecules is known as conduction.
Explanation:
Conduction is the transfer of heat through the material that are caused by temperature gradient with the material ends in heat flux. The heat transfer done by movement and mixing of a fluid is known as convection.
If a fluid is taken and it is kept as stationary. If there is a temperature gradient across that fluid, there would be transfer of heat that occurs in the fluid. It is negligible when compared to convective heat transfer.
Because of the heat transfer from solid to solid, density of liquid changes and start to move in upward direction due to low density. This type of motion is known as convection currents.
Answer:
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Explanation:
This is a classic problem in statics. The counterweight is placed so that the tower crane would be stable, or the total moment is zero. There are four sources of torques: the load, the jib BD, the jib BC, and the counter weight. Staring with the total moment equals zero, and taking clockwise moments as positive. The units of moment here is Mg * m.
M = 0
(2.0)(12.5) + (1.7)(9.5) - (0.6)(4) - (C)(7.5) = 0
7.5C = 38.75
C = 5.17 Mg
Therefore, the counterweight must be 5.17 Mg.
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Answer: option is C: the cross-section of the water decreases.
Explanation:
From the equation of continuity for in-compressible fluids (Bernoulli's equation),
a v = constant
where, a is the area and v is the velocity.
Also, pressure is inversely proportional to the velocity.

From the image, area of cross-section at A is greater than at B,

thus,

which means the velocity of water at B would increase and pressure of the water decreases. Hence, the correct option is C, i.e. the cross-section of the water decreases.