課程名稱︰普物甲
課程性質︰
課程教師︰王名儒
開課系所︰土木
考試時間︰94.11.10
試題 :
1.What's the measured area including error of a rectangle with width
25.0 ±0.5 m and length 20.0 ±0.2 m, assuming these two measurements
are uncorrelated.
2.A grasshopper leaps upward, rising 0.4 m in 0.2 sec. What was its
initial speed? How much higher does it go? Assuming the air effect
is negligible.
3.What's the total displacement for a particle traveling along the
x-axis between 0 and 5 sec with the a-t graph shown below? The
particle is at rest at t = 0 sec.
a(m/sec^2)
▕ ＿＿＿＿＿＿＿＿＿
3▕ ∕ ﹨
▕ ∕ ﹨
2▕ ∕ ﹨
▕ ∕ ﹨
1▕ ∕ ﹨
▕∕ ﹨
————————————————————
0 1 2 3 4 5 sec
4.A boy whirls a stone in a horizontal circle of radius 1.5 m and at
height 2.0 m above level ground. The string breaks, and the stone
flies off horizontally and strikes the ground after traveling a
horizontal distance of 10 m. What is the magnitude of the centripetal
acceleration of the stone during the circular motion?
5.Find the work done by the force F(x,y) = xy i + xy^2 j along the line
y=x from point (0,0) to (2,2).
6.During a rockslide, a 150 kg rock slides from rest down a hillside that
is 500 m long and 300 m high. The coefficient of kinetic friction between
the rock and the hill surface is 0.20. What is the speed of the rock as
it reaches the bottom of the hill?
7.A body of mass 2.0 kg makes an elastic collision with another body at
rest and continues to move in the original direction but with one fourth
of its original speed. What is the mass of the other body?
8.Write down the definition of rotational inertial for a rigid body rotating
about a fixed axis. Prove the parallel-axis theorem.
9.Explain which of the two are rolling faster in a down hill drive
(a) small car (b) fully loaded truck? Assuming none step on the gas.
10.The rotational inertial of a collapsing spinning star drops to 1/3 its
initial value. What is the ratio of the new rotaional kinetic energy
to the initial kinetic energy?
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.112.239.79