![3D"مسا=](3D"PhysicsContest2_files/image001.gif")
![3D"Physics](3D"PhysicsContest2_files/image002.gif")
![](3D"")
Two masses are connected through a ro=
d on
a movable car that can move freely on an inclined surface. The two masses a=
re
not of equal distance to the center of the car. The rod connecting the mass=
es
can rotate parallel to the track.
Choose the correct answer in part 1 and part 2 and explain your
answer:
Part 1:
When the student rele=
ases
only his left hand and the rod connecting the two masses becomes free to
rotate, what will happen?
A-
The rod will rotate clockwise when you=
look
from above.
B-
The rod will rotate counter-clockwise =
when
you look from above.
C-
The rod will not rotate.
Part 2:
When the student rele=
ases
both his hands and the car becomes free to slide on the track, and the rod
becomes free to rotate, what will happen?
A-
The rod will rotate clockwise when you look from above.
B-
The rod will rotate counter-clockwise when you look from above.<=
/span>
C-
The rod will not rotate.
Hint: You may need to read about Einstein's equival=
ence
principle
=
Submit your answer wi=
th your explanation
before 27 May 2007 to Tahmed@kfupm.edu.sa
Prizes
are:
- Cannon Scanner, =
- HP Color Printer, <=
/li>
- A valuable book by Dr. Zaghloul Alnaggar an=
d a Flash Memory 128 MB =
------=_NextPart_01C7892F.72CBDE20
Content-Location: file:///C:/A3745AB2/PhysicsContest2_files/image001.gif
Content-Transfer-Encoding: base64
Content-Type: image/gif
R0lGODlhegFJAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAAAAgB6
AUcAhgAAAAAAAB2ZnBqZnBaZmxOZmg6ZmiWZnyOZniCZnT6ZqzuZqjiZqDWZpzKZpS+ZpC2ZoimZ
oVeZvVOZu1CZuE6ZtkuZtEiZskWZr0GZrV+ZxVyZwlqZwHyZ33mZ3XeZ23WZ2XKZ1nCZ1G2Z0WqZ
zmeZzGWZyWOZx3+Z432Z4ZmZ/5iZ/peZ/ZaZ/JaZ+5WZ+5SZ+pSZ+ZOZ+JKZ95GZ9pCZ9Y+Z9I6Z
842Z8YuZ8IqZ7oiZ7YeZ64WZ6YOZ54GZ5cHBwQECAwECAwECAwECAwECAwECAwECAwECAwECAwEC
AwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwEC
AwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwEC
AwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwf/gACCg4SFhoeI
iYqLjI2Oj5CRkpOUlZaKAQGXm5ydnp+goaKjpKWlASqZpqusra6vi5qws4mqiLKgASu7K7aPuJO+
tMPExZjAxq+ZvbXIwb66vMyQwpHVydjZrtfao8u7zoLR3L/gANG8AUDU5pK64d3x8psBLPDzl5n1
LPz2t/3+KO2zp6+funW3oBm8d2gfQ3yx9OmDiK3eQ4q/BgIMWEgjR2sbZVlcR7IhP00aL3Y8iZFa
gBYwY7Yg13LVS1wIa1KTyXMmACA5z/FU2XDooExAkxp6GTOTTHW/nv7UWcuF1atYXRClyinAVVlB
uTbLihVpSUJerWoC6i6t1rM//9mGPVeWrlZBbBm5vTuXaqYXgAMLDrxVbKUAhOMaxjSYsNmkc/8e
VGoN8WSEkJcKXntubWa9hCkbDgCjtOnTqAsvtmYaat/VpFHDQDq15GvXUwXWzs27Y2zceHfrbd2b
a4AYyGNIPJ68uerVv5BPht6xufLHkD8byv66EfeMceVq1ytdtHEZMmwlzYS+ffru1AWinx7/nHv1
JMXDr52XkvhzkJinmCMBzNefcTPMgFN2ASTooIL71fdLgvTF1yCFeHE3niIHVsIWTduNFyFaFApY
UwA04LTbOijS4GKKxUkYjIvAWUhjcLbF6AqLhcE1I4wjxhNADcB8B8SQNSSZJP9UMlqCZIXQPZnh
d41IFMqQqnXoDpEmYhSADUXG+KUNZIIZZJO3kFljlGWCNSCBZYKZi5ywfMnZmRUVqeU5N/TZ50Fo
CuQnlIsF4OcNl1Fz6J+fGIpocKwY6hmeyfjiY0c4ZIrDmoESqClnFmqaKZPUiPqpJwGMqmNDIOq1
qXA66YlJDrTmQGinetV6q1gB1KqrNb76+lwttHqWa7GH2RoedPsFoMOzOnCKayzQAmohtNgW5iy2
1VJay7OgYsLtsOdEC6thze6g7g67akOuNeq269e69LL7C7uZ1EuqQAGsK+859car11L2dqlTszwk
fCdErXYSgMKr8prwxBOr9DD/DyJRHK47FCuMcMcYxxIyWiFfimYAPaScaD7LWelkD++ihYnKBs9D
Dsop56yyXjAPcmTO/yakM9AG4zw0zbX0jFbPNdcXgA9QL3zY01BXbXXLLWNSdczi3EP1xi09DQ/V
Vkcdi9ksbh1xLWVnErXJ4mxNtg/WLmX2UXSfWynXR/3g92Xe9u334IQXbvgPDwUwONeKI37L300L
6XhCjRPOUOOeZbL4nrVYjhLknGMuzuZ9VQ4q5pEfVtnk9KDgOm6Bn+P67LTXbvvsieOej+5Lva53
lRNt4zsiPNbuNe6ZGA93Q7TjEsDryz/v5vMoSEv98LJXD2ku2hPYfFcppDAp/+exhG/++einf37i
65NffvjhBAD/hnqt34r85t+zHvpjq9+++0exH17wtysCZgh/4tMSAhPIIvi9qRZVQov4CMQ/enTg
gpM6zAU3yMEOepCDYLnNBsH2CxAuBYNyoUYH+UYgEHaHJAFYYUM+6EIAimOEPjsSCnUUQwzWpod1
QwsOWeTDtZ2jA4lzXhFj8UHGecADIbRhQ56INYk88YpYpOLKlnLFoN0Ci0EMQBdTd5QsUvF+Y3wh
i8AYGTNm0Yti7OJy2Fi6NK4Ril2K42T0+MApJhEtZ+xOHKE4yCBa4wMfcFPsgoejnwQAkZCEpERy
VAtEkvAXkuzNIy25vIZEMv+TkYrkJTsiSk9+UpSdFMcpV2lJHopSIq28TSzP0UojPvKPR6nlLUC5
yUQuEgQgiGLsQgSUTADzmJPUEPkCAEwv1gKZ/WFmM8kojmZKM5hSpAc0R3TNYC6lm8GU5hYbcsxy
ltOY2NwTOJs5zdClk0XeBCAzE+fNo7yTnPV0ZDuDEYIwdUIpAQiBQPtJm8esKBb97CM1BrqvgApU
Wrd4qDgemk16SDRIDu1n6ax0JI3acqAgBWkmLhrRkIp0mQn9UEI/mtKIAiOg1mNocDI6rACIQAQL
GmYhimnTm2LnSICjX0dwSs1b+JQyPSVqNnsKFps6kx5HXepNiUo8yDhVqEf/SepUfYqSqN5mq2Bt
11XXg1OFDrWsXzXWWMOi1Ukl1ZCxGMEIVKTTpch1rsg40lwpWaW5GlEvcq1RAAKbSrQEdiqD3ev9
DounxOrvh4rlJtZgeNd9ffOumB3lOfxKWc7GlbENIWxWt7dZzHpWr579BQn0VFe0kOC1eS0mbM1a
i9XSlkCwFU0AcrvU2cp2tUV1EnCpudvcVlW241yEMo/E24jog7e3se16mouJ1xq3I9YF1G4zeA7r
ene1UCnuUwNQghIsqFHlFYZSjlRe81bxvZkw77IOY17dprewR2nvRMgL0SvB97/8BbA+5FvR/Bj4
HPoVsIKXQ+BiJvi/7X0w/4MlXMUIWzi98W1wlUxgAlk5jMOxBSiHRzziAHSYxCgmMXcF0mHddni+
ekmxiVtcUSedOMU4xrGJZ5xjFcOYEcvlMYhv3OMhC7nHbpUxkYvMZBUvuckyJmMAThCm1h6Fyjst
zpRPwOUuT3nLXQ5zmKUmECrD5cu/u4WYx0xaUnx5zXCO85vjLGY3+Sc3YKaynuns5T3zGcszrbOf
/0xoLs9Zzn8m8y00wFpUMXqnCtSApCfN6EpT+tKTXnEwHh1NTlc0AJiWtLFsYulQm5rSoAb1qVH9
48OgutSrTvWqM52hc1xa1rPO9atVHWqU8BrTye3IBjaQV1QRO8ulG7ayh/8dAGIv+9nL1rQ7js0b
9fz1KNBmdpu94exse/vZzW72t6O9bYFEu9vjdra40x1CcZx73dCGt7cz8e55u0beylZ0RzjAAQ87
rN+EqFkm+E3wAPSb4AhPeL+xWiV+j7ozU3KJwp+aj4Mr/OIXN7jBMZ7wYAuk4BbnuMNDLvKVbXzk
J0c4UgaO8YOcXOMZ5w7LVY7VAEhAAsVuVJX1suCs4bcWN7czxNPsXJvj/Ocs67nSq4h0Ai1d6bBS
sG3eWxIBH5RHy0lzACYwgUY3JBhdz2GQlkt2KrmD62GPZg79c6SuMxxVXBdm2edOdysHvO54VyYx
8853uk9J70uhQGwT8oz/u0divUbST6t/QYHGPzzgljiS4FN4isYLPjyKR/yBNbQszYvCwJnxPOdF
ryX9hD7zqN984n2U+qVUYPANeX3ha334vr+9FhXIfbtDdBjd354euZe97Ycf3EcQH++HQP7fOY/5
sief+UexgAX8+U3p11RFd9781YkeC+lPP83DDID39Z0L739/vdvPkW1SqH7ub0L77Yd/+hMh/xdG
TP5APlcALnCBBfO//8EAgOUmJP8HgF0Sfvx3Xt5QgOMzLQ5IDRgQgRI4gRRYgdhXJRhwgQ7TML8w
gYrUKBL4gaIQABQogg/YDCxkMxmwgizYgi74ghmwe1USg7SHKivIQgHg/4IN6DAsGEXeoIOYd4Kx
cIOdEgAKcIRImIRKuIQKYIJ60YQ+0yhJyIG1oIQLY3dGiIQaKIVT2EhCWIVamIIVsQBkWIZmeIZo
SIaA8wtqeFvBcIbkkglw2HwOY4bCdCVoOD52VyhzKCNP1zL5QQ0MwABCRw+DeIhxeIiIWGs1lhCK
SIgRp3OPCIkH9oW38IhiOA/HZw0N0ABw5SQB0ImeeCCM9E2ieIp6yHNjE4qn6Il06HRew4qtqId7
WCiySHFiEX/z5y0B4AAOoFmH8Ys50ou++F6+eIzFCDt/RYxVhIzH6IRVkoxY44zPeFCWGAvF6H6L
cXy8+ADeaFkbmB1dE/8A3liO5niOD0CLGJUJ6NiOtFgZ7RiP6dh8tWghQXWNVwIB+ggB4MgJ7Ocb
+xiQAnmFjdgZASCQ+2htTecbB4mQAakKlYiPQMZXEokqEXCREUCFtbcnQBUAGPmRP1V8DJl10Dc1
H4mRISmSQiiOFdkoB/CSMKmRAUJ/jgSI25d9vKGLkYdYPmeNLekI9fiT54AARFmUCFCKpsB37+d3
/ph3Qml8T4kqCTCVVFmVWZeUqheR79d5lOcJWbl4URmWNiEAZFmWZmmW//UJy1UKKhkggCeWcHk/
AzCXdFmXdnmXA5CJWTYtQRmXfnkMBBCYgjmYhDmYevmXiJmYkZcJBdBJmI75mJApk4o5mZQJCkBl
AJiZmZqJmUFVkJX5maDpHQZJdTcZmqZ5mh5ie6i5mqw5CaSnla0Zm7JJf0w5m7Z5m8nnk7i5mxQR
CAA7
------=_NextPart_01C7892F.72CBDE20
Content-Location: file:///C:/A3745AB2/PhysicsContest2_files/image002.gif
Content-Transfer-Encoding: base64
Content-Type: image/gif
R0lGODlh2wFHAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAIAAQDY
AUYAgQAAAAAAAICAgP9mAAL/hI8Qy+2dInpQ2ouz3pcyDobiuHkfiabqyrZh4Ebm+Q72jed31ek2
HAuyAr4BUIhELoq7Y/KJWkCnJadryfxZM8Ssd3vo+sDUsoJJNqtlYq9xDU8Q0/Hgkk5qu/Fh996i
h8NX1xK4Q4h45ieYWIY12DjSBcmBtfhWcpkFZmgk8BmpVBTwKRBq1vl3aicGZLqqYuk6pMmokapJ
KjMK8ApbyOv7K1p7OLyiByN8DJLcS1v8syyBmyucSgrKHIVWun1VvTf9jWG5403OFZgNHe3J5a5j
hf2cLkI/bl8TL60PP1bP3y556FKE+/KP3zlfnbLlEziQoDaI+xS+ozih20N7/w0L5rHIDpDFQwxH
mdqIURHBgCkTgmzZZ8xJmB1ZSvpSTVmPkZ5KypwIU44Jj0EjjgyZsiNQiNiIVhyTDRdSozke/HnV
1GZRBKC8Od1q4CADcSi/ZS27rSnanQC94ROpsVRObWrBWiiFd6ldlWgczl17rG5LpYCpCsorQLBh
RjMTb6rXUOveyZUQNpYqWV/kwoGDxeoW8C21TUCl0jUJigIgE+U8dJhxy3Ul1pJmULr1BfEnxatV
V/E94cFrc4IcxJZdm3ZvbDzuoZ7IO+Nz6TKfqSX+YzRAuPLY5ExDr7VUSti7A9NoUzQ15ri3KzDE
qRad8k1efOe+6HZY9NS75/9Te01cfFXlGBqLYaKdeTHlh19V5VzCB33uGUQaXnLIw4Be7/mBB3wL
TrhfLqsxGBuEBz52jwOHlTbdie8EaJJ1JoUzDy8JOtgfhw0asyNCbJn4GWjjtCJFYy4qeCAMEmZ3
oYhHInmjjk0CmYIpDcz0IYGSmQbjdA2J1SWBSxE2IIlTirnMkjZGaSY3zw2ZoW5pFkNGRzSGyaFH
B0GZY5tl5qahBnKy2OKZDhIaY4jy+FkTniTt5o4ufZ6TXqRsUnmTgYEe0FVXT645qRF7SvpnhaGK
c6mUWV7FWQSd+vTTj2iuuqKVIEFXaKl+xTNVdHtWZ6g1bv60Kaeb/rpSsD//QAhrfuggm+ypqCrq
bKvNCOiiTtS2tW002uqKZbcv6joWaLS+MSc/NY6yJKnOxWjtp6CeK6y4jzVLZ7oYtouVfOEKcVaP
TTQAaGq34rsQwtJASmyBwNrrEL3MTrqAXPw9JVG80ua5cbWlmvqxqFye65DDEoVMbBJc/sdTT/0q
9G2jtOpkMqUnZUUyomgACnEvBj+MsZYa27vDtETXC23EK2M282XmJv3vFfcGCm1cth788skQu9Ww
Sg88i+14pEgYEnx5KUJBsQK73A6GiY18NLNXyz13xgw/bDbYIl9Zd55qZ/rm2nSGhlO7hAO9Gbih
FflMuKJhNtPj1THEuJGA//vXttC94Bx3uU97vm+Gmwspo2cyh1V546jTJ9zQgo/7Ot1ZEws3uLPX
WnMT4wy69WlvWhyr7a7K+W6ul6MJfPDjJZ9xqCVbSJjCC5OrF+8562ZHwQ9VHav06P7M7dbX912V
FAlQ3eJmiDrAdV/mGzt07cOefPthEutyt9Y5+3xS7gspmx3yFccKxQIQ/7JXIZRwz270KtnHkKIU
cTlQLDRYm9KsFpyKYW9U78tcrZAROKKVDYMGHB8AHdhA8G2igrJakcr+8hWJcQh/p6Kh+KQnqcTF
DUMtpNQNL2CkyMlHPxaMWvFW4igfPvBw4RPhvwLmPCHmokOeIQZpVNdDa/9YKIW4Slnv/oRC7tUp
fcbjilPE6MGEBYmBXOyd74LnRH2FziopQ2MWI4bABKptgaLy1AmxCEXFnQ5lBkqSzx5oxMoMjkLm
eo1LGCNHLSGyi827nrw4JkBVGdJ1T4pYWcTmAcQkqSC8UUreKCmfVF3Qix/xFiNRs5MO1pAoZCqh
7ZLIto7RbYfziiMnZeiyvyFSdUHckqacV6nqeGgaC1xX+HQ4Pye1MlH4kaXimFlFaA7Te9/i5cSA
2csl/nKHNETLygaFPliakGL+Q6EuozXJScYvUtaSX7A6SKYTtq+S8WzjOz0GTni6UWraW8vKDhjD
dfaTnaeMHeZ+GJ08VM3/Xde6GAARNMg4ihOHh1SoN/3GBn9F0mYEZZdXKqrO46lRo8oqjzu9IzcT
RjQKyJqKIlMqrSPkU6YW3ektL2qbUFZPTZL05Xl+Vxj1HFFzItQKfJa5gbfRCDKkU+rq9CNVjqnU
fql6EeeiWDokNjCZYgVrMc+amc0R9SJOLCm36omtpbrQoxLsmqB2Q7Y3as2nijLOXbNq0ZvC8X7M
ExNQ9zkro7I0iuhsLBDxaku+TrNhrYJcNEmiT6eOYXIh6Ir6dMXEh46VAzdrZNBwlFP+fbVnhbUf
N1kSUZn1L4ieQktpBxtBEGpKmF3tyWUXxs0zVotqzTGA/9iWT1+F8z0s//ypXOcIw4XKU7o+lWxu
DVLc0bFSss8dWFAfBK/fomuWDh1vBs0Rn2dWUZzkpSOTkAnXltmQaW2tXwAzi8tu7k8ofj1vG9Ir
WqtudZFF5O1hUflBeeGxZ4tZpRdNg7q4hIexlW1ZLsezobAVypYPbM5Xn6rTQrITwQO0JkrVlcV+
xLeJoNUQmMYkYohe7Dt/Ye8PJ6suP6Ksxvb1bQovitol3s+fziUkgrqbryElEMcrne6nFnw0FXVt
p3xM2HG1kGFWIlmLOvOW3rabK7EAmWAxxjDrtmhkIhrZb0o2bXdtaONOYjGgx7zxmo+ZSUHcK62P
pCdZvRzaQ8EXyJj9qP9n8ly0OoNTv+25lTHLmIkNQ5qQUDY0Azlc5QnCLKGR5hWaLY07hWKazXS2
G6LJ0mWcNhprXbXpiYtqZ0LD+Z+Y6zFbS81UUDdZvM7KjBgtd82xjpTFfFxwsefMS0aD9ygsi+tp
cznQ3kKb0L+LNq2tfG1s6zbJX5no2RRb5GSneri4RPWwEyvYHLt4z0y+74+bfejyMga26832rHEN
u6NOLJGGLid5zSrnc/fFiBO9Nzn5LW0RwZufbyZlYHPK6Zp+29r/1KBwIfQ8cGB84g61OIy1bN2C
XTLjlwzmwrXcZ0+7eAacHo5Q/cu+jXB4RCtUxphgQ1ycvIrmK0QowL7/s/MSmXS23lENdFi+btKF
1H0HfE3hgr50qLQc5kG1TUfvgs4VWO98Wz9Rpe9iG+xhXewuTxvHlyPUTwdBqmmfOn+/JsrHEm94
ZC863APF9rurfT1Dibt49E6Cxgr+7K4iJrIDb/jdJX7ZggYMWoF9l8ULavEIL/zj+dyCy1c+A5ef
fDEjD3kJaB6IlD88Bkbv+NKjAPWlR0nWVfB6rtf9wJwR/F9nL/e5d9axZrB9lbp+et2bUfiij33u
cX974kcV+CAYvPPH+YuzQJ8y1K++9a8fgwoeFPvc7773vw8wLRhu8+Avv/nP732JGxj97G+/+zHy
q6+/f/70rz9Hdmn/Vvzrf/+nGJXp+Q+AASiAeaRHA2iAB4iAA2ZY05eADeiA5ncne/eAE0iB+5cT
/1eBGaiB7hdUhLeBHwiC5rdzXsGAIWiCJ0gOvoeCK8iC2Ed+LQiDLVgAADs=
------=_NextPart_01C7892F.72CBDE20
Content-Location: file:///C:/A3745AB2/PhysicsContest2_files/image003.gif
Content-Transfer-Encoding: base64
Content-Type: image/gif
R0lGODlhMQMXAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAEAAQAw
AxUAgQAAAAAAAP+ZAAECAwLvjI+py+0Po5y02ouz3rz7D4biSJbmiabqmgruC8fyTNf2jef6zvf+
DwwKh8Si8YhMKpfMpvMJjUqnTgP1is1qt9yu9wsOi8fkMtlqTqvX7Lb7DY/L5/QZuo7P6/f8vv8P
+HcXSFhoeIiYqLgIN8j4CBkpOUlZCehomam5ydnp+ZmDCTpKWmp6irommsra6voKG1uzKltre4ub
e0ir2+v7CxzMxStcbHyMnDwboNzs/AytSxxNXW19zTiNvc3d7e2m/S0+Tl4OFW6err7OboPeDh8v
3/0+b3+Pb8yyz9/v/w8woMCBBAsaPIgwocIABQAAOw==
------=_NextPart_01C7892F.72CBDE20
Content-Location: file:///C:/A3745AB2/PhysicsContest2_files/image004.gif
Content-Transfer-Encoding: base64
Content-Type: image/gif
R0lGODlhMQMXAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAEAAAAw
AxYAgQAAAAAAAAD//wECAwL4jI+py+0Po5y02ouz3rz7D4biSJbmiabqegKBAMfyTNf2jef6zvf+
DwwKh8Si8YhMKpfMpvMJjUqn1CrUYM1qt9yu9wsOi8fksvlsxqLX7Lb7DY/L5/S6vaa+6/f8vv8P
GCgYmDdoeIiYqLjI2ChX6BgpOUlZaXkpCIm5ydnp+QkauqMpWmp6ipqq2ka66voKGys7e9NKe4ub
q7ubaMv7CxwsPOzlS3yMnKy8XPvC/AwdLb1rPG19jZ3tWK3d7f0NDscdTl5ufi41jr7O3u6Oo/4u
P0//HV+Pn6+PfL/v/w8wFouBBAsaPIgwocKFDBs6fAgxosQABQAAOw==
------=_NextPart_01C7892F.72CBDE20
Content-Location: file:///C:/A3745AB2/PhysicsContest2_files/filelist.xml
Content-Transfer-Encoding: quoted-printable
Content-Type: text/xml; charset="utf-8"