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Answers
Answer:
Initial speed (u) = 54 km/h = 15 m/s
Final speed (v) = 72 km/h = 20 m/s
Mass of car (m) = 1500 kg
To Find:
Work done by the force on the car (W)
Answer:
WORK-ENERGY THEOREM
The change in kinetic energy of a particle is equal to the work done on it by the net force.
\begin{gathered}\bf \leadsto W = \Delta K \\ \\ \rm \leadsto W = K_f - K_i \\ \\ \rm \leadsto W = \dfrac{1}{2} mv^2 - \dfrac{1}{2} mu^2 \\ \\ \rm \leadsto W = \dfrac{1}{2} m(v^2 - u^2) \\ \\ \rm \leadsto W = \dfrac{1}{2} \times 1 500(20^2 - 15^2) \\ \\ \rm \leadsto W = 750(400 - 225) \\ \\ \rm \leadsto W = 750 \times 175 \\ \\ \rm \leadsto W = 131250 \: J \\ \\ \rm \leadsto W = 131.25 \: kJ\end{gathered}
⇝W=ΔK
⇝W=K
f
−K
i
⇝W=
2
1
mv
2
−
2
1
mu
2
⇝W=
2
1
m(v
2
−u
2
)
⇝W=
2
1
×1500(20
2
−15
2
)
⇝W=750(400−225)
⇝W=750×175
⇝W=131250J
⇝W=131.25kJ
\therefore∴ Work done by the force on the car (W) = 131.25 kJ
Answer:
Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together. After the salt compounds are pulled apart, the sodium and chloride atoms are surrounded by water molecules, as this diagram shows. Once this happens, the salt is dissolved, resulting in a homogeneous solution.
When table salt, sodium chloride, dissolves in water, it dissociates into its respective cations and anions, Na+ and Cl-. ... Ionic compounds such as sodium chloride, that dissolve in water and dissociate to form ions, are called electrolytes. Please Watch animation 10.3 on ionic solutions.
Dissolving salt in water may be considered a physical change because no change occurs in the electron shells of the sodium and chlorine atoms and no chemical reaction occurs between sodium chloride and its solvent (water).
Explanation:
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