Answer:
Explanation:
Forehand groundstroke effectiveness is important for tennis success. Ball topspin angular velocity (TAV) and accuracy are important for fore hand groundstroke effectiveness, and have been extensively studied, previously; despite previous, quality studies, it was unclear whether certain racquet kinematics relate to ball TAV and shot accuracy during the forehand groundstroke. This study evaluated potential relationships between (1) ball TAV and (2) forehand accuracy, and five measures of racquet kinematics: racquet head impact angle (i.e., closed or open face), horizontal and vertical racquet head velocity before impact, racquet head trajectory (resultant velocity direction, relative to horizontal) before impact, and hitting zone length (quasi-linear displacement, immediately before and after impact). Thirteen collegiate-level tennis players hit forehand groundstrokes in a biomechanics laboratory, where racquet kinematics and ball TAV were measured, and on a tennis court, to assess accuracy. Correlational statistics were used to evaluate potential relationships between racquet kinematics, and ball TAV (mixed model) and forehand accuracy (between-subjects model; α = 0.05). We observed an average (1) racquet head impact angle, (2) racquet head trajectory before impact, relative to horizontal, (3) racquet head horizontal velocity before impact, (4) racquet head vertical velocity before impact, and (5) hitting zone length of 80.4 ± 3.6˚, 18.6 ± 4.3˚, 15.4 ± 1.4 m·s-1, 6.6 ± 2.2 m·s-1, and 79.8 ± 8.6 mm, respectively; and an average ball TAV of 969 ± 375 revolutions per minute. Only racquet head impact angle and racquet head vertical velocity, before impact, significantly correlated with ball TAV (p < 0.01). None of the observed racquet kinematics significantly correlated to the measures of forehand accuracy. These results confirmed mechanical logic and indicate that increased ball TAV is associated with a more closed racquet head impact angle (ranging from 70 to 85˚, relative to the ground) and increased racquet head vertical velocity before impact.
The type of health insurance that is not considered as a managed care plan would be traditional health maintenance organization.
But you didn’t ask specifically which care plan so I’m going off a managed care plan.
Answer:
It's a non-hybridized bell pepper that is one of the largest, and best sweet bell peppers
Explanation:
I believe it could be answer A. Because when you are stabbed, it does alert your body. But also it could be answer D because you’re body does try to fight the bacteria.
Not much help sorry, I also could be completely wrong. Good luck
Answer: Examples
Explanation:
In some elderly people, the senses required for safe driving like vision and hearing are compromised. Those who have impaired vision may drive safely during day but find difficulty at night. These adults are subjected to accidents then people of other age groups.
In the given situation, the Karl is claiming that elder people are bad drivers. He has supported the claim by giving reasoning involving examples of 75 year old grandfather and 68 year old woman.
