Given conditions:
height of object = 7.5cmdistance of object from mirror = 14 cmfocus length = -7 cmimage distance = ?
Using mirror formula:
1/(focus length) = 1/(object distance) + 1/(image distance)
or, -1/7 = 1/14 + 1/(image distance)
or, image distance = -4.66cm (the image formed is a virtual image)
Also, magnification of image is:
image height /height of object = - image distance /object distance
or, image height = - image distance / object distance * height of object
or, image height = -(-4.66) / 14 * 7.5 = 2.49 = 3(nearest whole number)
Answer:
Wave speed = 1.25 m/s
Explanation:
Given that the
wavelength = 0.25 m.
Frequency F = 5.0 Hz
The speed of a wave is the product of wave frequency and the wavelength. That is
V = F λ
Where
V = wave speed (m/s)
λ = wavelength (m).
F = frequency (Hz).
Using the formula above gives:
V = 0.25 × 5
V = 1.25 m/s
Answer:
If the balloon acquires charge, Sam's hair loses charge.
Explanation:
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