The object is at rest.
This is due to the fact hwen two forces act upon each other on opposite sides, the movement of the object does not change due to the net force equaling 0.
Answer:
D
Explanation:
P=Work/Time
The rate at which work is done matches that.
Answer:
t = 1.15 + .713 = 1.863 [s]
Explanation:
To solve this problem we must use the following kinematic equation, but first we identify the initial data.
vo = 7 [m/s]
yo = 4 [m]
g = 9.81[m/s^2]
![v_{f}=v_{o}-g*t\\0 = 7 - (9.81*t)\\7 = 9.81*t\\t = 0.713[s]](https://tex.z-dn.net/?f=v_%7Bf%7D%3Dv_%7Bo%7D-g%2At%5C%5C0%20%3D%207%20-%20%289.81%2At%29%5C%5C7%20%3D%209.81%2At%5C%5Ct%20%3D%200.713%5Bs%5D)
The final velocity happens at the moment when the maximum height is reached, at this point the final speed is zero.
![y=y_{o}+v_{o}*t-0.5*g*t^{2}\\ y = 0+ (7*0.713)-0.5*9.81*(0.713)^{2}\\ y = 2.5[m]](https://tex.z-dn.net/?f=y%3Dy_%7Bo%7D%2Bv_%7Bo%7D%2At-0.5%2Ag%2At%5E%7B2%7D%5C%5C%20y%20%3D%200%2B%20%287%2A0.713%29-0.5%2A9.81%2A%280.713%29%5E%7B2%7D%5C%5C%20y%20%3D%202.5%5Bm%5D)
The total elevation will be 2.5 + 4 = 6.5 [m]
Now using again the total height we can find the final velocity.
![v_{f}^2=v_{o}^2+2*g*y\\v_{f}=\sqrt{2*g*y}\\ v_{f}=\sqrt{2*9.81*6.5}\\ v_{f}=11.3[m/s]](https://tex.z-dn.net/?f=v_%7Bf%7D%5E2%3Dv_%7Bo%7D%5E2%2B2%2Ag%2Ay%5C%5Cv_%7Bf%7D%3D%5Csqrt%7B2%2Ag%2Ay%7D%5C%5C%20v_%7Bf%7D%3D%5Csqrt%7B2%2A9.81%2A6.5%7D%5C%5C%20v_%7Bf%7D%3D11.3%5Bm%2Fs%5D)
With this final velocity we cand find the time.
![v_{f}=v_{i}+g*t\\11.3=0+9.81*t\\11.3=9.81*t\\t=1.15[s]](https://tex.z-dn.net/?f=v_%7Bf%7D%3Dv_%7Bi%7D%2Bg%2At%5C%5C11.3%3D0%2B9.81%2At%5C%5C11.3%3D9.81%2At%5C%5Ct%3D1.15%5Bs%5D)
Now we have to sum the two times, the time it takes to go up and the time it takes to go down.
t = 1.15 + .713 = 1.863 [s]
Answer:
- Cool, dense air begins to sink downward.
- A high-pressure system forms.
- Pressure differences cause wind to blow outward.
- The skies clear, making way for pleasant weather.
Explanation:
The air near the land warms up and rises. Cool dense air sinks being heavier. This creates a pressure difference. A high pressure system forms. This difference leads to blowing of wind from High pressure to low pressure area. Eventually sky gets clear and we experience pleasant weather. Hence, the correct order to describe this is:
- Cool, dense air begins to sink downward.
- A high-pressure system forms.
- Pressure differences cause wind to blow outward.
- The skies clear, making way for pleasant weather.
The letter D represents the wavelength
