Using lens equation;
1/o + 1/i = 1/f; where o = Object distance, i = image distance (normally negative), f = focal length (normally negative)
Substituting;
1/o + 1/-30 = 1/-43 => 1/o = -1/43 + 1/30 = 0.01 => o = 1/0.01 = 99.23 cm
Therefore, the object should be place 99.23 cm from the lens.
Answer: MA= Radius of wheel divided by Radius of Axle
Explanation:
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It'll last 20 hours. If it travels 110 miles in one hours, 110 times 20 equals 2,200.
