**Unformatted text preview: **Quiz.7
Physics 1250
Name.
Circle your TA's name and write your name above. Each problem is worth 4 points.
It/ =[FXF|=rFsino a= It
Vr=rw azra a,=rw? Krot=> Iw L=rxmv=Iw
I disk = I cylinder =7
1 MR I hoop= I thinring = MR
Ipp = mr?
* 1) Without wheels a certain skateboard has a mass of 2.50 kg. Each of the four wheels can be approximately
Y
modeled as a uniform disk with a mass of 0.200 kg and a radius of 3.25 cm. Find the total kinetic energy of the
skateboard when it is rolling at a speed of 3.2 m/s.
a) 6.14 J
b ) 12.8 J
C) 4.10 J
d) 2.05 J
e) 18.9 J
m : 2.song
m: ?.56 ng
V= 3.2 MIS
md: 0. 20049
2 ( Z MR " ) ( + ) + 2 ( 2, 8 ) ( 3. 2 )?
mtotal: 7158 2 070 0xu
m tatal: 3.3 bag
2) Gear A with radius A= 8.25 cm and angular velocity WA = 6.28 rad/sec is used to turn
C
gear B with radius Is = 3.33 cm by a chain. Gear B and wheel C are fixed with each
A
other so they turn together and the radius of the wheel is 24.8 cm. Find the tangential
speed of a point on the rim of wheel C.
B
a) 0.518 m/s
b ) 15 .6 m/s
"c) 3.86 m/s
O
d) 0.241 m/s
e) 8.33 m/s
CeerA
CA : 8.28 cm
W: 4.28 radisic
Gearb
1 to : 3. 3 3 cm
W
B
rc = 24,8 cm...

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- Fall '18
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