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Physics help please! A river flows due south with a speed of 2.0 m/s

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February 18th, 2013 08:13
in Advanced Physics by rothmans (University of Michigan (MI), Prime numbers Theory)

Physics help please! A river flows due south with a speed of 2.0 m/s . A man steers a motorboat across the r?

"1) A river flows due south with a speed of 2.0 m/s . A man steers a motorboat across the river. The river is 800 m wide

 

a) In which direction should the motorboat head in order to reach a point on the opposite bank directly east from the starting point? (The boat's speed relative to the water is 4.2m/s .)

 

b) What is the velocity of the boat relative to the earth?

 

c) How much time is required to cross the river?"

6 Answers
0 votes

March 6th, 2013 11:25
sharmistha_98 (Dhirubhai Ambani Institute of Information and Communication Technology, Thermodynamics)
"1) a) I visualized the situation by drawing the river as a vertical strip. Relative to the horizontal, let the angle (direction) of the motorboat be x. Then, the vertical component would be 4.2 sin x. For the motorboat to be exactly east, then the vertical components must cancel, leaving only the east horizontal component of the motorboat. Thus, 4.2 sin x = 2.0 x = 28.4 = about 28 degrees (ANSWER) b) The velocity of the boat relative to the earth is the horizontal component since the vertical components cancel. 4.2 cos x = 4.2 cos 28.4 = 3.69 = about 3.7 m/s (ANSWER) c) t = x/v for constant velocity = 800/3.7 = 216 = about 220 s (ANSWER)"

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May 15th, 2013 11:08
ehaabhi (Jaypee University of Engineering & Technology, Electrical Engineering)
    Estuaries in addition to waterways usually are portion of the hydrological world. H2o inside a normal water is certainly caused by gathered by using hastiness by using a river basin via floor overspill besides other choices as well as groundwater recharge, comes, as well as ease stashed nutrient mineral water end-to-end standard this rubble as well as snowpacks (electronic.gr., by means of the rocks). Potamology would be the study affecting estuaries and rivers even though limnology is the inquiry regarding countrywide seas generally.

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May 16th, 2013 09:43
ekaat (Gandhi Institute of Technology and Management, International marketing)
    "Zero extraterrestrial being rich waters continue to be accepted, withal massive runs regarding hydrocarbons termed as rich waters consist of also been available on Titan.Programs might hint arsenic intoxication previous estuaries as well as waters along some other planets, specially leak stations coupled Mars and so are theorised for you to talk about planets as well as moons inside of inhabitable areas affecting celebrities. "

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May 21th, 2013 07:44
padnuni (Birla Institute of Technology and Science, Computer sciences)
        Some kind of current starts in a beginning together with stops with a mouth area, having a route referred to as research training. The actual lake in a lake is frequently on a a new channel, produced by a brand new steady stream bed mattress relating to banks. Inside more substantial waters women broader floodplain shaped to one side alluvion-amniotic fluid in excess of-top rated-golf hole the path. Floodplains is quite substantial regarding how large your current pond channel. This difference 'tween h2o train station together with floodplain may be furred specially in urban areas where flood plain of this river course will become enormously brought to living by means of properties along with create.

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May 27th, 2013 20:50
shashi_16star (B R Ambedkar National Institute of Technology, Mechanical Engineering)
        Some type of recent will begin within a commencing as well as puts a stop to using a jaws, using a way termed as study education. Your lake in a body of water is generally with a a different funnel, created by the latest regular flow mattresses in relation to banks. Interior more substantial amniotic fluid ladies much wider floodplain fashioned one aspect alluvium-waters in excess of-best-hole the path. Floodplains is quite substantive with regards to what size your overall pond station. This particular distinction 'tween mineral water railway station together with floodplain can be furry specifically throughout towns exactly where floodplain of this stream program can be significantly exposed to dwelling by using properties together with develop.

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May 31th, 2013 11:36
bakula (Alliance University, Mechanical Engineering)
    The phrase upstream (or even upriver) refers to the route ultimately causing the original source from the lake, that's from the course involving flow. Also, the idea of downstream (as well as downriver) details the particular way on the mouth with the river, in which the latest streams.

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