From: Subject: Ch3_1 Date: Sat, 6 Sep 2008 18:00:17 -0400 MIME-Version: 1.0 Content-Type: multipart/related; type="text/html"; boundary="----=_NextPart_000_0000_01C9104A.6B69F420" X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3350 This is a multi-part message in MIME format. ------=_NextPart_000_0000_01C9104A.6B69F420 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Content-Location: file://D:\20739.html Ch3_1
Ch3_1
 
New Problems reloads the page with new = variable=20 values in all questions. You must do this after grading the test = to rework=20 it another time.
Make sure to calculate your answers = in SI=20 units unless specified otherwise .
1) = The=20 x-component of a velocity vector is - m/s and the y-component is m/s. What is the magnitude of the velocity (sheet=20 3,4 and 5) ?=20
2) The magnitude of a velocity vector is and its direction is degrees (measured counter clockwise from the positive = x-axis).=20 What is the y-component (sheet 3,4 and=20 5) ?=20
3) The x-and y-components of two vectors A and = B in=20 the notation (x, y) are ( , ) for A and (-6, ) for B in arbitrary units. What is the direction of the vector = C=20 =3D (A - B) measured as an angle between the vector = C and the=20 positive x-axis in counter clockwise direction (sheet 6 - convince yourself with the = graphical "head=20 to tail" method that your result makes sense, see sheet=20 7,8; such a graphical evaluation will be required in midterm = 1 ) ?=20 =20
4) A person runs on a slowly moving trailer with m/s toward the back end of the trailer. What is the velocity of = the=20 person relative to the ground if the trailer has a velocity of m/s (sheet 13,14,14') ? The = direction=20 in which the trailer moves is the positive x-axis.=20
5) A person in a rowboat crosses a river which flows with km/hr. The person rows with maximum velocity of km/hr relative to the water (measured while rowing on a still = lake) and=20 heads the boat straight across the river - along a line at 90 = degrees=20 with respect to the river shore pointing to a point on the opposite = shore. How=20 far downstream from this point in km does the person reach the = opposite=20 shore if the river is km wide (sheet 13, similar = to 15, but figure on the right on sheet=20 16"' is relevant ) ?=20
6) A person in a rowboat crosses a river which flows with km/hr. The person rows with maximum velocity of km/hr relative to the water (measured while rowing on a still = lake) and=20 wants to reach the opposite shore directly across from the start point - = along a=20 line at 90 degrees with respect to the river shore . At what = angle with=20 respect to this line does the person have to point the boat (sheet 15 to 16") ? Indicate with a negative = (positive)=20 sign whether the boat has to be pointed upstream (downstream).=20

Once you have=20 submitted your answers for grading by clicking the grade button, you = cannot=20 resubmit answers for the same Problem Set--you must use the 'New = Problems'=20 button first.=20
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