作者NBASCIDM (战神)
看板NTU-Exam
标题[试题] 黄晖理 普物甲上 第一次小考
时间Sat Oct 25 14:10:32 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)︰2008/10/08
考试时限(分钟):60分钟
是否需发放奖励金:是
(如未明确表示,则不予发放)
试题 :
1.A baseball leaves a pitcher's hand horizontally at the speed of 150 km/hr,
the distance to the batter is 18.3m. The batter hits the ball into a fly,
the initial speed of the ball is 30m/s directed at angle θ=45度 above
the horizontal. The ball falls to the ground 93.3m far from the batter.
(a)how long does the ball take to travel from the pitcher to the batter?
(b)the maximum height H of the ball above the ground?
(c)at what height h1 does the batter hit the ball?
(d)at what height h2 does the ball leave the pitcher?
2.A 20kg monkey climbs up a massless rope that runs over a frictionless tree
limb and back down to a 25kg package on the ground.
(a)what is the magnitude of the least acceleration to the monkey must have,
if it is to lift the package off the ground?
If,after the package has been lifted,the monkey stops its climb,and holds
onto the rope,what are the(b)magnitude and(c)direction of the monkey's
acceleration,(d)and the tension in the rope.
3.A 10.0kg block is sent sliding up a plane inclined at θ=39度
while a horizontal force F of magnitude 70N acts on it.The coefficient of
kinetic friction between block and plane is 0.40.The block's initial speed
is 5.0m/s.
(a)what is the magnitude and direction(up or down the plane)of the block's
acceleration?
(b)how far up the plane does the block go?
(c)when it reaches its highest point,does it remain at rest or slide back
down the plane?
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