A river has a steady speed of 0.30 m/s. A student swims downstream a distance of 1.2 km and returns to the starting point. If the student swims with respect to the water at a constant speed and the downstream portion of the swim requires 20 minutes, how much time is required for the entire swim?
a. 50 minutes
b. 80 minutes
c. 90 minutes
d. 70 minutes
e. 60 minutes
d
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A horizontal uniform meter stick supported at the 50-cm mark has a mass of 0.50 kg hanging from it at the 20-cm mark and a 0.30 kg mass hanging from it at the 60-cm mark. Determine the position on the meter stick at which one would hang a third mass of 0.60 kg to keep the meter stick balanced
a. 74 cm b. 70 cm c. 65 cm d. 86 cm e. 62 cm
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What will be an ideal response?
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