In the fall 2006, the National Basketball Association (NBA) started using basketballs made with synthetic, or manmade material instead of leather. They made the switch because they wanted every basketball they use to feel and bounce the same.
However, some players complained right away that the new balls bounced differently and were actually harder to control than leather ones. Dallas Mavericks owner Mark Cuban asked for help the Department of Physics at the University of Texas. The scientists investigated friction that affects the ability of a player to hold onto a ball. "The greater the friction, the better it will stick to his hand", explains Horwitz, one of the physicists who worked on the project.
Tests on both wet and dry balls showed that while the plastic ball was easier to grip when dry, it had less friction and became much harder to hold onto when wet. That's because sweating stays on the surface of the synthetic balls but gets absorbed into the leather balls—an important detail for sweaty athletes.
In January, the NBA went back to use the traditional leather balls. They aren't perfect, but for now, that's just the way the ball bounces.
The NBA started using synthetic basketballs instead of leather ones because ______.
A.NBA players had used the leather balls for too long a time
B.NBA officials wanted a switch with which to start a reform
C.they emphasized that synthetic materials are manmade
D.they wanted every basketball to feel and bounce the same
第5题
A.树立正确的经营道德观
B.做好采购供应的道德要求,确保药品质量,并要及时准确
C.做好安全储运的道德要求
D.药品销售服务中的道德要求
E.药品广告宣传中的道德责任
第6题
A.树立正确的经营道德观
B.做好采购供应的道德要求,确保药品质量,并要及时准确
C.做好安全储运的道德要求
D.药品销售服务中的道德要求
E.药品广告宣传中的道德责任
第7题
A.树立正确的经营道德观
B.做好采购供应的道德要求,确保药品质量,并要及时准确
C.做好安全储运的道德要求
D.药品销售服务中的道德要求
E.药品广告宣传中的道德责任
第8题
A.树立正确的经营道德观
B.做好药品采购生产、销售的道德要求
C.药品广告宣传中的道德责任
D.药品销售服务中的道德要求
E.做好药品采购供应的道德要求
第9题
A.广告宣传中的道德要求
B.销售服务中的道德要求
C.安全储运的道德要求
D.采购供应的道德要求
E.正确经营的道德要求
确保药品质量、及时准确、廉洁奉公是做好药品的
第10题
A.广告宣传中的道德要求
B.销售服务中的道德要求
C.安全储运的道德要求
D.采购供应的道德要求
E.正确经营的道德要求
确保药品质量、及时准确、廉洁奉公是做好药品的
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