We can determine the __________ of a wave when given the frequency and the wavelength. (2 points)
2 answers:
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1) Average velocity: 19 mi/h
The average velocity is given by:
where
d is the displacement
t is the time taken
In this problem,
d = 3.8 mi is the displacement
is the time taken
Substituting,
Note that this is actually the average speed, not the average velocity, since there is no information about the direction of the motion.
2)
The acceleration is given by
where we have
v = 28 mph is the final velocity
u = 18 mph is the initial velocity
t = 3.5 s is the time taken
Conerting the time from seconds to hours,
So the acceleration is
Answer:
The answer is β=0,85 rads
Explanation:
As the ladder is leaning against the building, we can imagine there´s a triangle where 20ft is the hypotenuse and 15ft is the maximum vertical distance between the ladder and the ground, it means, the leg opposite to β which is the angle we need
Let β(betha) be the angle between the ladder and the ground
We also know that
In this case we will need to find β, this way:
Then β=48,6°
We also have that 2πrads is equal to 360°, in this way we find how much β is in radians:
then we find β=0,85rads