2 years ago

If you place a hot block of metal in room temperature water is it convection or conduction?

2 answers:

4 0

The answer is Conduction: the process of heat is directly transmitted through a substance when there is a difference in temperature.

jonny [76]2 years ago

3 0

Answer:

convection

Explanation:

Convection is a process by which heat is transferred by the movement of a heated fluid such as air or water.

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An experiment begins with crystalline salt at the bottom of an otherwise empty glass. First, students add water to the glass. Th

vfiekz [6]

Answer:

Explanation:

When we add salt to water entropy of the system increases because some amount of energy is released as salt dissolves in the water due to the dissociation of ions.

Therefore entropy of the system after the salt dissolves is highest among them all and the least entropy is associated when mixing begins.

Entropy is the degree of randomness and it increases when salt dissociates to $Na^{+}\ and\ Cl^{-}$ as these ions are freer to move inside an aqueous solution compared to Previous state.

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3 years ago

A woman on a bicycle traveling at 10 m/s on a horizontal road stops pedaling as she starts up a hill inclined at 4.0º to the hor

IrinaK [193]

The kinetic energy K = 0.5 * m * v² must be equal to the potential energy U = m * g * h.

m mass
v velocity
h height
g = 9.81m/s²

The mass m cancels out:
0.5 * v² = g * h
Solve for height h and transform to distance traveled.
(sin (4°) = height / distance)