The list of choices you provided with your question
is utterly devoid of any such examples.
Answer:2.6 h
Explanation:
Given
Total Trip distance=450 miles
Meeting starts after 10.8 hours
safe Fastest speed is 55 mi/h
so if he drives all the to the meeting with max speed then it takes ![=\frac{450}{55}=8.181 h](https://tex.z-dn.net/?f=%3D%5Cfrac%7B450%7D%7B55%7D%3D8.181%20h)
and total allowable time is 10.8
Therefore longest time he can spend over dinner is ![10.8-8.181 \approx 2.6 hours](https://tex.z-dn.net/?f=10.8-8.181%20%5Capprox%202.6%20hours%20)
An element becomes a + ion when it...loses electrons
Answer:
v = 5.24[m/s]
Explanation:
Este problema se puede resolver por medio del principio de la conservación de la energía, donde la energía potencial es igual a la energía cinética. Es decir a medida que el carrito desciende su energía potencial disminuye, pero su energía cinética aumenta.
![E_{kin}=E_{pot}](https://tex.z-dn.net/?f=E_%7Bkin%7D%3DE_%7Bpot%7D)
Donde:
![E_{kin}=\frac{1}{2} *m*v^{2} \\\\E_{pot}=m*g*h](https://tex.z-dn.net/?f=E_%7Bkin%7D%3D%5Cfrac%7B1%7D%7B2%7D%20%2Am%2Av%5E%7B2%7D%20%5C%5C%5C%5CE_%7Bpot%7D%3Dm%2Ag%2Ah)
Ahora reemplazando:
![\frac{1}{2} *m*v^{2}=m*g*h\\\\0.5*v^{2}=9.81*1.4\\v=\sqrt{\frac{9.81*1.4}{0.5} } \\\\v=5.24[m/s]](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%7D%20%2Am%2Av%5E%7B2%7D%3Dm%2Ag%2Ah%5C%5C%5C%5C0.5%2Av%5E%7B2%7D%3D9.81%2A1.4%5C%5Cv%3D%5Csqrt%7B%5Cfrac%7B9.81%2A1.4%7D%7B0.5%7D%20%7D%20%20%20%5C%5C%5C%5Cv%3D5.24%5Bm%2Fs%5D)