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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?"

Answers (6)

sharmistha_98 06-03-2013
"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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ehaabhi 15-05-2013
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ekaat 16-05-2013
    "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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padnuni 21-05-2013
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shashi_16star 27-05-2013
        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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bakula 31-05-2013
    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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