Answers:
1) I saw a jogger whose velocity was about 3 m/s going straight North.
2) A car passed me at a velocity of almost 45 mles per hour, straight South.
3) I saw a dog chasing a cat. The cat was runing at about 40 km/h, but the dog barely reached 32 km/h, both 30° North of the East.
Explanation:
- <em>Velocity is a vector</em> and so you must report it using the <em>magnitude and </em>the<em> direction</em>.
- Velocity has <em>units</em> of distance (meter, kilometer, miles, among others) divided by units of time (second, minutes, hours, among others).
- The magnitude of velocity is also called <em>speed</em>, and you calculate speed (average speed) as per the formula <em>Speed = distance / time</em>.
The velocities described above have these meanings:
Velocity Magnitude (speed) units direction
3 m/s going North 3 m/s m/s North
45 m.p.h hour, South 45 miles per hour miles/h South.
40 km/h 30° North of East 40 km/h km/h 30° North of East
40 km/h 30° North of East 35 km/h km/h 30° North of East
Remeber, <em>vectors, like velocity, must be describe by its magnitude and direction.</em>
Answer:
2.72 m
Explanation:
Sound travels at a certain speed and has a frequency and wavelength. The relationship between the speed of sound (V), its frequency (f), and wavelength (λ) is the same as for all waves, it is given by the equation:
V = fλ
The speed of sound in air (V) is 334 m/s
Frequency of sound (f) = 123 Hz
Wavelength = λ
V = fλ
λ = V/f = 334/123
λ = 2.72 m
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