[单选题]
Two identical objects P a
)vuuw8*b k j n1bb4.:n ktpk)dnd Q are connected to identical springs. Both P and Q
-(lyz6t-avp av z :h(uo*f*sc/q1kbh are performing simple harmonic motion
s- f*c:/yb(hupo1hat ( vzakz6-lq v* (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.
