3.如圖所示,在水平轉(zhuǎn)臺(tái)上放置有質(zhì)量相同的滑塊P和Q(均視為質(zhì)點(diǎn)),它們與轉(zhuǎn)臺(tái)之間的動(dòng)摩擦因數(shù)相同,P到轉(zhuǎn)軸OO′的距離為r
P,Q到轉(zhuǎn)軸OO′的距離為r
Q,且r
P:r
Q=1:2,轉(zhuǎn)臺(tái)繞轉(zhuǎn)軸OO′勻速轉(zhuǎn)動(dòng),轉(zhuǎn)動(dòng)過程中,兩滑塊始終相對(duì)轉(zhuǎn)臺(tái)靜止。認(rèn)為最大靜摩擦力等于滑動(dòng)摩擦力,重力加速度大小為g,下列正確的是( ?。?/div>
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發(fā)布:2024/9/24 2:0:8組卷:111引用:3難度:0.5