When a candle burns, the form energy that is being transformed from chemical energy would be heat energy and light energy. The flame is in the form of light energy. Also, <span>the wax melts and then volatilizes, so some energy is going into the material to do that, called latent heat.</span>
Use the Pythagorean theorem to find the magnitude of the resultant, southeast vector. A squared plus B squared equals C squared, right?
<span>so, (south)^2 + (east)^2 = (southeast)^2 </span>
<span>(11.5)^2 + (18.3)^2 = (resultant)^2 </span>
<span>Resultant = 21.6 km/s</span>
Answer:
80mm or 8cm
Explanation:
According to the lens formula,
1/f = 1/u+1/v
If the object distance u = 4cm = 40mm
Object height = 1.5mm
Image height = 3mm
First, we need to get the image distance (v) using the magnification formula Magnification = image distance/object distance = Image height/object height
v/40=3/1.5
1.5v = 120
v = 120/1.5
v = 80mm
The image distance is 80mm
To get the focal length, we will substitute the image distance and the object distance in the mirror formula to have;
1/f = 1/40+1/-80
Note that the image formed by the lens is an upright image (virtual), therefore the image distance will be negative.
Also the focal length of the converging lens is positive. Our formula will become;
1/f = 1/40-1/80
1/f = 2-1/80
1/f = 1/80
f = 80mm
The focal length of the lens 80mm or 8cm
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