homework help: Need help with physics homework please! - Help.com



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Need help with physics homework please!

!!

A hunter wishes to cross a river that is 1.35km
wide and flows with a speed of 2 km/h par-
allel to its banks. The hunter uses a small
powerboat that moves at a maximum speed
of 17 km/h with respect to the water.
What is the minimum time necessary for
crossing? Answer in units of min.

This open post was written 1 year ago | V/U/S: 340, 1, 2 | Edit Post | Leave a reply | Report Post


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sugar_baby_tweety_bi offline Unverified User #
An Unknown Location | 1 year ago (1 day, 11 hours after post)

”A hunter wishes to cross a river that is 1.35km
wide and flows with a speed of 2 km/h par-
allel to its banks. The hunter uses a small
powerboat that moves at a maximum speed
of 17 km/h with respect to the water.
What is the minimum time necessary for
crossing? Answer in units of min.”

Ok so I will have a go at this
OK first of all as the speed of the boat is 15 km/hr or 15km/60 min with respect to speed of waterwhat you will want to do is add the speed of the water to speed of the boat. The speed of water is 2km/hr or 2km/60min. 15+2=17
So now your speed increases to 17km/60m.

Now the hunter wants to cross the river which is 1.35 km. So what you will do is find the unit time. So you would take the 17km and divide it by the 60m. Making the answer to that 0.2833(repeated 3) now that is your new speed per minute. Making it 0.2833km/1min now you will take your speed per minute and multiply it by the distence across the river. so 0.2833*1.35= 0.382455

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