Surface tension is a property of a liquid to resist the external force. It is the result of cohesive forces between the molecules of the liquid.
The stronger the cohesive forces between the molecules of the liquid, the stronger is the surface tension.
Since methylated spirit has weaker cohesive forces than water, it will also have a weaker surface tension.
Answer:
0.7 mJ
Explanation:
<u>Identify the unknown: </u>
The work required to turn the dial from 180° to 0°
<u>List the Knowns: </u>
Capacitance when the dial is set at 180°: C = 350 pF = 350 x 10^-12 F Capacitance when the dial is set at 0°: C = 100 pF = 100 x 10^-12 F
Voltage of the battery: V = 130 V
<u>Set Up the Problem:</u>
<em><u>Energy stored in a capacitor: </u></em>
U_c=1/2*V^2*C
=1/2*Q^2/C
<em><u>When the dial is set at 180°:</u></em><em> </em>
U_c=1/2*(130)^2*350*10^-12=10^-4
Q=√2*U_c*C=4*10^-7
<u><em>When the dial is set at 0°:</em></u>
U_c=1/2*(4*10^-7)^2/100*10^-12
=8*10^-4 J
<u><em>Solve the Problem: </em></u>
ΔU_c=7*10^-4 J
=0.7 mJ
note:
there maybe error in calculation but method is correct
Answer:
k=694.44
Explanation:
PE=1/2kx^2
5=1/2k*.12^2
5=1/2k(.0144)
divide both sides by .0144
It is C) because that truck has more mass
