This experimental method of determining the surface tension of a liquid is called the Du Nüoy Ring method. The equation for this is:
σ = F/4πR
where
σ is the surface tension
F is the net force acting on the ring
R is the radius of the center ring
σ = F/4πR = [(16 g - 10 g)(1 kg/1000 g)(9.81 m/s²)]/{4π[(10 m + 9.5 m)/4]}
σ = 9.608×10⁻⁴ N/m
Answer:
6 Joules
Explanation:
The change in internal energy must be equal the work done by pushing the handle with a 20 N force a distance of 0.3 meters. That is:
Change in internal energy = Work = 20 * 0.3 J = 6 Joules
The resistance of the lamp plugged in to a standard wall outlet with a current of 0.5 amps is 240 Ω (ohms)
Explanation:
In the United States Of America the standard voltage is 120 v and their frequency is 60 Hz
Standard wall outlet voltage is 120 V
The current in the lamp is 0.5 ampere
Resistance (R) = V/ I
= 120/0.5
= 240Ω (ohms)
Thus the resistance of the lamp plugged in to a standard wall outlet with a current of 0.5 amps is 240 Ω (ohms).
Answer:
It inflicted psychological harm on children.