One mole of ideal gas increases its volume from 10 L to 40 L with constant pressure P = 1 atm. The work done by the ideal gas is
30 J
0.3 J
0
As in the problem (2), what’s the final temperature after expansion?
273 oC
486oC
315oC
100oC
213oC
A ball falls from rest at a height of 100m. When the ball hits the ground the ground speed is about (Please ignore the air resistance)
36m/s
100m/s
45km/hr
160km/hr
100km/hr
A distant galaxy moves away from Earth at a relative speed of 0.9 c. How far is the galaxy?
5.0×1017 ly
1.7×109 ly
53 ly
1.6×1010 ly
A permanent magnetic bar is moving away from the wire loop as shown in the figure.
The induced current in the wire will
An electric current of 0.5 A is flowing through a resistor of 8Ω . The electric power consumed by the resistor is
16W
32W
4W
2W
What quantity is not conserved in the process e− + e+ →γ +γ
total momentum
total energy
total angular momentum
total mass
total electric charge
Consider a solid copper cylinder of length L and cross section A. If the length L is doubled then
the conductivity is also doubled.
the resistivity is also doubled.
the resistance is also doubled.
the mass density is also doubled.
the charge concentration is doubled.
下列敘述何者正確?
現今的核能發電是利用核融合反應,釋放出能量
台灣的核能三廠位於台北縣的萬里鄉
核能事故中的所謂中國併發症(china syndrome),意思指得是中國於新疆試爆核彈,導致中亞地區罹患癌症人數增加
日本,美國以及前蘇聯等國家的核電廠曾經發生嚴重的核能災變
光合作用是一種核分裂反應
A sound wave of frequency 1500 Hz moves toward a reflection wall with the speed 40 m/s. The frequency of the reflected sound wave is about
1700Hz
1650Hz
1600Hz
1550Hz
1500Hz
下列關於理想彈簧(ideal spring)的敘述何者為非?
彈簧的恢復力,和其伸長量成正比。
理想彈簧的運動週期,和其最大伸長量無關。
具備相同彈力常數(spring force constant)的理想彈簧,質量較大者有較短的運動週期。
具備相同質量的理想彈簧,彈力常數較大者有較大的震動頻率。
下列關於Kepler’s laws of planet motion 的敘述何者為非?
行星以橢圓形軌道(elliptical orbits)繞行太陽
太陽位於行星橢圓軌道的中心點
行星橢圓軌道的長軸愈長,公轉的週期也愈長
從太陽到行星連一線條。這條線在單位時間內所掃過的面積是相等的。
一個質量為m 的物體以速度V 運動於無摩擦的平面,向靜止的且質量為M 的物體撞過去。碰撞後兩個物體卡在一起成為一個質量為(m + M)的大物體並一起運動。此大物體的運動速度為何?
0
MV /(M + m)
mV/M
MV/m
mV/(m+M)
一個4.0 m 長、10.5 kg 重的均勻梯子,斜靠在無摩擦的牆壁上。假設梯子和地面的靜摩擦係數為0.50。若梯子能夠斜靠此牆壁,且保持平衡。則梯子和地面的最小夾角為何?
以上皆非
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