What activates a convection current starting the flow of liquid

Answer:

Endothermic reaction

Explanation:

(a) Endothermic reaction: These are reactions that absorb heat from the surrounding during a chemical reaction. The enthalpy change for endothermic reaction is always positive,  and the energy level of the product is higher than that of the reactant

(b) Exothermic reaction: These are reactions that release heat to the surrounding during chemical reaction. The enthalpy change for exothermic reaction is always positive, and the energy level of the product is lower than that of the reactant.

From the diagram in the question,

Since the energy level of the product is higher than that of the reactant then the reaction is an endothermic reaction and as such, ΔH is positive

Answer:

The correct answer is B

Explanation:

The moment of an object is the product of its mass by velocity, it is described by the equation

          p = mv

In this problem they give us the most body and speeds before and after the crash. We must define an environment with both bodies so that the forces during the crash have been internalized and the moment is preserved

         Δp = pf -p₀

         Δp = m - m v₀

         Δp = 2 9 -2 1.5

         ΔP = 14.8 m/s

The correct answer is b

Answer:

Radius of the loop =

Explanation:

The magnetic field at the center of a circle is given by the formula

where I current = 4.2A

Magnetic Field , B = T

= ( permeability)

plugging in the parameters and evaluating, we have

=

The radius of the  loop =