Ch2_2

From: Subject: Ch2_2 Date: Sat, 6 Sep 2008 17:59:02 -0400 MIME-Version: 1.0 Content-Type: multipart/related; type="text/html"; boundary="----=_NextPart_000_0000_01C9104A.3F0B9DC0" X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3350 This is a multi-part message in MIME format. ------=_NextPart_000_0000_01C9104A.3F0B9DC0 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Content-Location: file://D:\4657.html Ch2_2

Ch2_2

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 position=20 x of an object as a function of time is given as x =3D + t + t². All quantities are understood to be quoted in = SI=20 units. What is the initial velocity (see sheet = 14 ,=20 16) ? Indicate with a negative (positive) sign whether the=20 acceleration is constant (not constant) for the given expression.=20

2)An object starting with m/s is under a constant acceleration of m/s² over a distance of m. What is the final velocity (see = sheet 15 ,15'=20 )?=20

3) An object, initially at rest, falls under the influence of gravity = (neglect=20 air resistance) and reaches a speed of m/s. For how many seconds did it fall (see sheet=20 19) ? Indicate with a positive (negative) sign whether with = air=20 resistance the fall time is smaller (larger) than without air = resistance.=20

4) An object, initially at rest falls under the influence of gravity = (neglect=20 air resistance) a distance of m. How many seconds does it fall (see=20 sheet 19) ?=20

5) An object is tossed vertically downward from an m height and reaches the ground after seconds. What was its initial velocity from the toss (neglect air=20 resistance, see sheet 14) ? = =20

6) An object is launched vertically upward with m/s. How high does it rise (neglect=20 air resistance , see sheet 23' ) ? =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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