题目

Can you be too beautiful? It is hardly a problem that most of us have to bother — as much as we might like to dream that it were the case. Yet the blessings and curses of beauty have been a long-standing interest in psychology. Do those blessed with shiny faces and an attractive body live in a cloud of appreciation — or does it sometimes pay to be ordinary? Combing through decades of findings, social psychologists Lisa Slattery Walker and Tonya Frevert at the University of North Carolina at Charlotte have reviewed all the evidence to date and their conclusions are not what you might （2011?上海二模）一小车沿倾角为θ的斜面向下匀加速运动．小车的支架上缚着一质量为m的小球，其摆线恰好处于水平状态，如图所示．则小车的加速度大小是gsinθgsinθ；摆线的拉力大小是mgctgθmgctgθ．