Explanation:
We need convert the velocities first to m/s and we get the following:
v2 = 21 km/hr = 5.8 m/s
v1 = 11 km/hr = 3.1 m/s
We need to find the mass of the car also for later use do using the work-energy theorem:
6.0x10^3 J = (0.5) m [(5.8)^2 - (3.1)^2]
or
m = 499.4 kg
Now we determine work needed delta W to change its velocity from 21 km/hr to 33 km/hr
v2 = 33 km/hr = 9.2 m/s
v1 = 21 km/hr = 5.8 m/s
delta W = (0.5)(499.4)[(9.2)^2 - (5.8)^2]
= 1.3 x 10^4 J
Answer:
192 mm/s
Explanation:
The frequency, speed and wavelength of any given wave are related to one another by the formula;
fλ = v
Where f denotes the frequency, v the speed or velocity and λ the wavelength
We are given that;
λ = 12
f = 16
v = 16 * 12 = 192 mm/s
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The answer is C and I know it because I had to answer it.
