The sum of the resistance = 2 ohms x 80 lights = 160 ohms.
Current = Total voltage / total resistance:
Current = 120V / 160 ohms
Current = 0.75 Amps
Answer:
Image formed by a <u>convex mirror</u> is always <u>virtual and erect</u>. When an object is placed at infinity, virtual image is formed at focus and the size of the image is <u>smaller</u>.
<h2>도움이되기를 바랍니다!</h2>
Answer:
A. As the ropes are horizontal the child has travelled 2m of vertical displacement from his lowest position.
Gpe @ A=mgh=40*9.81*2=784.8J
B. At 30degree vertical angle the vertical displacement from lowest position is given by
2-2cos(30)=2-1.73=0.27m
Gpe @B= 40*9.81*0.27=106 J
C: at the bottom of circular arc it's Gpe is zero relative to lowest position as bottom of arc itself is lowest position.
1) 30 volts is correct
2) Rt = (4x6)/(4+6)=2.4 Ω
3) P = I^2 x R = 36 W
we use AC because it's easy to transmit via 3 phase on cables and easy to step up and down
<span>Torque = force * distance from axis of rotation. Multiply.
If it's not perpendicular, you multiply that with the sine of the angle between the force and the perpendicular direction.
T= 0.470*57*Sin 90 = 26.79 N</span>
