D: Ultraviolet Rays is the answer hope that helps
Answer:
I would agree with the statement. it's not just the body, but everything that we see is almost 99.9999% empty space
Answer:
She covers the distance is 12 km.
The magnitude of displacement is 8.6 km.
The direction of her displacement is north east.
Explanation:
Given that,
Christina drives his moped 7 kilometers North and stop for lunch and then drive 5 km east.
We need to calculate the total distance
Using formula of distance
![d=d_{1}+d_{2}](https://tex.z-dn.net/?f=d%3Dd_%7B1%7D%2Bd_%7B2%7D)
Put the value into the formula
![d=7+5](https://tex.z-dn.net/?f=d%3D7%2B5)
![d=12\ km](https://tex.z-dn.net/?f=d%3D12%5C%20km)
We need to calculate the magnitude of displacement
Using formula of displacement
![D=xi+yj](https://tex.z-dn.net/?f=D%3Dxi%2Byj)
![D=5i+7j](https://tex.z-dn.net/?f=D%3D5i%2B7j)
![D=\sqrt{5^2+7^2}](https://tex.z-dn.net/?f=D%3D%5Csqrt%7B5%5E2%2B7%5E2%7D)
![D= 8.6\ km](https://tex.z-dn.net/?f=D%3D%208.6%5C%20km)
The direction of her displacement is north east.
Hence, She covers the distance is 12 km.
The magnitude of displacement is 8.6 km.
The direction of her displacement is north east.
Answer:
Uniform Circular Motion
Explanation:
Uniform circular motion can be described as the motion of an object in a circle at a constant speed. As an object moves in a circle, it is constantly changing its direction. At all instances, the object is moving tangent to the circle.
Answer:
The slope of a position-time graph represents an object’s velocity.
Explanation:
In a position-time graph, the values on the x-axis represent the time, while the values on the y-axis represent the position of the object.
Velocity is defined as the ratio between the displacement of an object and the time taken:
![v=\frac{\Delta s}{\Delta t}](https://tex.z-dn.net/?f=v%3D%5Cfrac%7B%5CDelta%20s%7D%7B%5CDelta%20t%7D)
However, we can see that this definition corresponds to the slope of the curve in a position-time graph. In fact:
, the displacement, corresponds to the difference in position, so the difference between the values on the y-axis: ![\Delta s=y_2 -y_1](https://tex.z-dn.net/?f=%5CDelta%20s%3Dy_2%20-y_1)
, the time interval, corresponds to the difference in times, so the difference between the values on the x-axis: ![\Delta t= t_2 -t_1=x_2 -x_1](https://tex.z-dn.net/?f=%5CDelta%20t%3D%20t_2%20-t_1%3Dx_2%20-x_1)
So, the velocity is
![v=\frac{\Delta s}{\Delta t}=\frac{y_2 -y_1}{x_2 -x_1}](https://tex.z-dn.net/?f=v%3D%5Cfrac%7B%5CDelta%20s%7D%7B%5CDelta%20t%7D%3D%5Cfrac%7By_2%20-y_1%7D%7Bx_2%20-x_1%7D)
which corresponds to the slope of the curve.