作者NBASCIDM (战神)
看板NTU-Exam
标题[试题] 97上 黄晖理 普物甲上 第三次小考
时间Thu Dec 4 14:42:34 2008
课程名称︰普通物理(甲)上
课程性质︰大一共同必修
课程教师︰黄晖理
开课学院:生农学院
开课系所︰生物产业机电工程学系
考试日期(年月日)︰2008/12/3
考试时限(分钟):50 minutes
是否需发放奖励金:是
(如未明确表示,则不予发放)
试题 :
1.Observations of the light from a certain star indicate that it is part of a
two-star system.This visible star has orbital speed v=300km/s,orbital period
T=1.50 days and approximate mass m1=5Ms (Ms is sun's mass=1.99×10^30kg).
Assume that the visible star and its companion star,which is dark and unseen,
are both in circular orbits.What multiple of Ms gives the approximate mass
m2 of the dark star?
2.Water flows through a horizontal pipe and then out into the amtosphere at a
speed v1=20m/s.The diameters of the left and right sections of the pipe are
10.0cm and 5.0cm.
(a)What volume of water flows into the atmosphere during a 5 minutes period?
(b)What is the speed v2 in the left section of the pipe?
(c)What is the gauge pressure in the left section of the pipe?
3.A wheel is free to rotate about its fixed axle.A spring is attached to one
of its spokes a distance r from the axle.
(a)Assuming that the wheel is a hoop of mass m and radius R,what is the
angular frequency ω of small oscillations of this system in terms of
m,R,r,and the spring k?
(b)if r=0.5R,ω=?
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