[单选题]
Two identical objects
u/cbb 7a irgbzz ;*u0 -./wyhjP and Q are connected to identical springs.
(o.dm +byqp :lfow*i 4Both P and Q a
ybom*: oipq. +4l(wdfre performing simple harmonic motion (SHM) around equilibrium level O.
The diagram shows positions of P and Q at time $t=0$. Which graph shows how kinetic energy of P and Q vary with time t?
A.
B.
C.
D.
参考答案:
A
本题详细解析:
Explanation:
Potential energy is in its maximum value at boundaries (extreme points), kinetic energy at a maximum value at equilibrium point. So at $t=0$, for P kinetic energy is a maximum, for Q potential energy is a maximum but kinetic energy is zero. For both masses, the kinetic energy will maximise every half cycle.
At $t=\frac{T}{2}$ again for P kinetic energy is a maximum, for Q potential energy is a maximum.
