Wave speed = frequency * wavelength
We need to rearrange this equation because we are finding the wavelength :
Wavelength = wave speed / frequency
To rearrange it, I just divided it by frequency so that wavelength was the subject.
Now, input these numbers into this equation :
Wavelength = wave speed / frequency
Wavelength = 25 / 5
Wavelength = 5m
Answer:
Q = 142.324kJ
Explanation:
Data:
M = 500g = 0.5kg
T1 = 10°C = (10 + 273.15)K = 285.15K
T2 = 80°C = (80 + 273.15)K = 353.15K
Q = ?
C = 4186J/kg.K
Q = mc(T2 - T1)
Q = 0.5 * 4186 * (353.15 - 285.15)
Q = 0.5 * 4186 * 68
Q = 142324J
Q = 142.324kJ.
Answer: D.) 39,200 J
Via the equation of potential energy PE = mgh where m is mass, g is the average gravity on earth and h is the height. In this case m = 400 kg, g = 9.8, h = 10 m thus:

P.E.= 39,200 Joules
The power require to keep the car traveling is 6,666 W.
The power of the engine at the given efficiency is 3,999.6 W.
<h3>What is Instantaneous power?</h3>
This the product of force and velocity of the given object.
The power require to keep the car traveling is calculated as follows;
P = Fv

The power of the engine at the given efficiency is calculated as follows;

Learn more about efficiency here: brainly.com/question/15418098