The answer is the fourth choice because there are 7 represents in a coefficient.
Answer:
Mechanical advantage = 4
Explanation:
Given the following data;
Distance of effort, de = 8m
Distance of ramp, dr = 2m
To find the mechanical advantage;
Mechanical advantage = de/dr
Substituting into the equation, we have;
Mechanical advantage = 8/2
Mechanical advantage = 4
The answer is that it is true
Answer:
20 m/s
Explanation:
First, we calculate for the acceleration down the incline using
.
a = (9.80)sin(20°)
a = 3.35
Then, we use one of the kinematics equations,
.
= 0 m/s
a = 3.35
= 62 m
![v_{f} = \sqrt{2(3.35)(62)}](https://tex.z-dn.net/?f=v_%7Bf%7D%20%3D%20%5Csqrt%7B2%283.35%29%2862%29%7D)
![v_{f} =20.381 = 20 m/s](https://tex.z-dn.net/?f=v_%7Bf%7D%20%3D20.381%20%3D%2020%20m%2Fs)
The light does not undergo a phase change.
Also, the surface of a mirror is a rigid boundary.