Answer:
Water is a polar molecule
Explanation:
The general solubility rule is that like dissolves like. In short, polar solutes would dissolve in polar solvents. Non polar solutes also dissolves on non polar solvents.
NaCl is an ionic molecule which forms as a result of transfer of electrons from one atom to another. The transfer of electrons makes the atoms oppositely a charged ions and they become polar.
Water is made up of Hydrogen H⁺ ions and hydroxy ions OH⁻. Water is an heteronuclear covalent molecule. Here, there is an unequal sharing of electrons as one atom pulls the shared electron more closer. This leaves a partial negative charge on the more electronegative atom and a partial positive charge on the other.
This polar nature of water NaCl makes dissolution easy.
1). Wrap more turns of the wire around the nail.
2). Increase the electrical current through the wire. (Do this by inserting another battery in the circuit, in series with the first one.)
Answer: true
They vary from element to element
Answer:
A. increase
Explanation:
Stirling cycle having four processes
1.Two processes are constant temperature processes
2.Two processes are constant volume processes
The efficiency of Stirling cycle is same as the efficiency of Carnot cycle.
The efficiency of Stirling cycle given as
=Lower temperature
=Upper temperature
If we increase then upper temperature while the lower temperature is constant then the efficiency of Stirling cycle will increase because the ratio of lower and upper temperature will decreases.
Therefore answer is
A. increase
Approximate the instantaneous velocity by computing the average velocity of the car over the interval [1.95, 2.05] (i.e. the interval centered at <em>t</em> = 2 s with length 0.1 s).
By definition, average velocity is given by
<em>v</em> = ∆<em>x</em> / ∆<em>t</em>
So we have
<em>v</em>(2 s) ≈ (<em>x</em>(2.05 s) - <em>x</em>(1.95 s)) / (0.1 s) ≈ 13.94 m/s