Answer:
A. Muscular endurance
Explanation:
Muscular endurance is measured by the amount of time a muscle group can sustain a contraction.
Answer:
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Explanation:
Answer:
Explanation:
According to the Principle of Energy Conservation and the Work-Energy Theorem, the bullet has the following expression:
![F\cdot \Delta s = \frac{1}{2}\cdot m \cdot [v_{A}^{2}-v_{B}^{2}]](https://tex.z-dn.net/?f=F%5Ccdot%20%5CDelta%20s%20%3D%20%5Cfrac%7B1%7D%7B2%7D%5Ccdot%20m%20%5Ccdot%20%5Bv_%7BA%7D%5E%7B2%7D-v_%7BB%7D%5E%7B2%7D%5D)
The average force exerted on the bullet to stop it is:
![F = \frac{m\cdot [v_{A}^{2}-v_{B}^{2}]}{2\cdot \Delta s}](https://tex.z-dn.net/?f=F%20%3D%20%5Cfrac%7Bm%5Ccdot%20%5Bv_%7BA%7D%5E%7B2%7D-v_%7BB%7D%5E%7B2%7D%5D%7D%7B2%5Ccdot%20%5CDelta%20s%7D)
![F = \frac{(7.8\times 10^{-3}\,kg)\cdot [(540\,\frac{m}{s} )^{2}-(0\,\frac{m}{s} )^{2}]}{2\cdot (0.051\,m)}](https://tex.z-dn.net/?f=F%20%3D%20%5Cfrac%7B%287.8%5Ctimes%2010%5E%7B-3%7D%5C%2Ckg%29%5Ccdot%20%5B%28540%5C%2C%5Cfrac%7Bm%7D%7Bs%7D%20%29%5E%7B2%7D-%280%5C%2C%5Cfrac%7Bm%7D%7Bs%7D%20%29%5E%7B2%7D%5D%7D%7B2%5Ccdot%20%280.051%5C%2Cm%29%7D)
Answer:
Convection
Explanation:
Convection: the lighter warm air moves up and the heavier cold air moves down.
