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Test 2 review
Test 2 auditorium assignments by the first one/two letter of your last name:A - B: FLG 270C - D: LIT 109E - Gh: LIT 113Gi - H: MAEA 303I - K: LIT 121L - N: BRY 130O - S: WEIM 1064T - Z: NEB 100
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Test 2 announcements cont’d
• Test is Tuesday, Feb 27 8:20-10:10pm
•May bring 1 81/2 x 11 handwritten sheet
• Must bring UFID
• Calculators are allowed, no cell phones,blackberries, …
• Test conflicts see me after class
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Test 2 F06 selected problems
Ans: 10m/s
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Test 2 F06 selected problems
Ans: mgL/2
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Test 2 F06 selected problems
3. An ice cube, starting at rest on top of a hemispherical igloo ofradius R, slides off. How fast is it going when it hits the ground?
2RgAns:
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Test 2 F06 selected problems
Ans: 0.75
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Test 2 F06 selected problems
Ans: 0.5
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Test 2 F06 selected problems
Ans: 15
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Test 2 F06 selected problems
Ans: 0.333
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Test 2 F06 selected problems
Ans: 60N
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Test 2 F06 selected problems
5 m/s
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Test 2 F06 selected problems
Ans: 0.1m
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Test 2 F06 selected problems
Ans: (1)
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Test 2 F00 selected problems
Ans: 15.9 J
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Test 2 F00 selected problems
3N/m4
Ans: 6 m/s
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Test 2 F00 selected problems
15. In an emergency braking maneuver, a 600-kg car deceleratesat 8 m/s2 beginning at t=0, when the car is going10m/s and continuing until it stops. What power is being dissipated in the brakes at t=1s?
Ans: 9600 W
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Test 2 F00 selected problems
18. A spring is made of a strange material which does not obey Hooke's Law for the restoring force when stretched from its relaxed length a distance x, F=-kx, but rather is found to obey F=-kx3/2. The ``spring constant" k is measured to be 10.0 N/m3/2. How much work must you do to stretch it 10.0 cm?
Ans: 0.013 J