Answer:
Wy = - 268.3*cos(42) = - 199.38 [N]
Wx = 268.3*sin(42) = 179.52 [N]
Explanation:
To solve this problem we must make a free body diagram, in the attached image we can see a free body diagram.
Taking the inclined X & y axes with the same angle of 42°, we can see that the weight can be decomposed on both axes.
Since the angle is adjacent to the y-axis, we can use the cosine function
Wy = - 268.3*cos(42) = - 199.38 [N]
Wx = 268.3*sin(42) = 179.52 [N]
Answer:
Frequency is 0.5 Hz and the wave speed is 10 m/s.
Explanation:
As we know that frequency is defined as the how many times the no of cycles repeat in one second so if the wave is vibrating up and down twice during 1 second then the frequency in 1 second is

Therefore frequency is 0.5 Hz.
Now the distance of wawe in each second is,

Now the wave velocity is,

Here, f is frequency, d is the distance, v is the wave velocity.
Substitute all the variables

Therefore the wave speed is 10 m/s.
the correct answer would be C. 5m/s^2
20-5 = 15
15/3 = 5