- #1
Shay10825
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Hi everyone! I need help on these two problems:
1.) A flower pot is knocked off a balcony 20m above the sidewalk and falls toward an unsuspecting 1.75-m-tall man who is standing below. How close to the sidewalk can the flower pot fall before it is too late for a shouted warning from the balcony to reach the man in time? Assume that the man below requires .3 s to respond to the warning.
Would I use the formula:
v=(d)/(delta t)? If so how?
The answer is 7.82m
2. Consider the sinusoidal wave, with the wave function:
y=(15 cm) cos(.157x-50.3t)
At a certain instant, let point A be at the origin and point B be the first point along the x-axis where the wave is 60 degrees out of phase with point A. What is the coordinate of point B?
I did:
y=(15 cm) cos(.157x-50.3t)=60
15cos(.157x)=60
cos(.157x)=4 and this is impossible
I have no clue what to do.
~Thanks
1.) A flower pot is knocked off a balcony 20m above the sidewalk and falls toward an unsuspecting 1.75-m-tall man who is standing below. How close to the sidewalk can the flower pot fall before it is too late for a shouted warning from the balcony to reach the man in time? Assume that the man below requires .3 s to respond to the warning.
Would I use the formula:
v=(d)/(delta t)? If so how?
The answer is 7.82m
2. Consider the sinusoidal wave, with the wave function:
y=(15 cm) cos(.157x-50.3t)
At a certain instant, let point A be at the origin and point B be the first point along the x-axis where the wave is 60 degrees out of phase with point A. What is the coordinate of point B?
I did:
y=(15 cm) cos(.157x-50.3t)=60
15cos(.157x)=60
cos(.157x)=4 and this is impossible
I have no clue what to do.
~Thanks