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Answer: Doppler effect
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Explanation:
A radar gun (also known as a Doppler radar) uses the Doppler effect when measuring "return echoes" after having sent a microwave signal (a type of electromagnetic radiation).
In this context the Doppler effect consists of the change in a wave perceived frequency when the emitter of the waves, and the observer move relative to each other.
In the case of radars, a microwave signal is sent to a target (the tennis or baseball in this case) and then is reflected after "hitting" the target, so that the radar system measures this difference between the sent signal and the reflected signal.
esteban Julio ricardo Montoya de la rosa ramirez
Answer:
=(220^2 +150^2)
/
put this on a square root
for you to get 266.2705391
round it to a whole number =266km/h
Explanation:
p
Answer:
Height of ramp = 17.49 m
Explanation:
We have equation of motion , 
, s is the displacement, u is the initial velocity, a is the acceleration and t is the time.
Considering horizontal motion of skier
Initial velocity = 33 m/s, Displacement = 63 m, acceleration = 0 and we need to find time taken to reach ground by the skier.
The vertical distance traveled in 1.909 seconds is the height of ramp
Initial velocity = 0 m/s, acceleration = acceleration due to gravity = 9.8 
, time = 1.909 s and we need to find displacement.
So height of ramp = 17.49 m
Answer:
Technician B is correct i-e IAT type coolant should be changed every 2 years.
Explanation:
Coolant is one of the most important fluid for the car as it prevents the engine from overheating during summers and freezing during winters. What it does is that it actually lowers the freezing point during summers and increases the boiling point of the system during summers. There are different types of coolant used by different cars. Among which, two of them are:
1) OAT i-e Organic Acid Technology
2) IAT i-e Inorganic Additive Technology
IAT type coolants are usually used by older cars and generally should be usually replaced every 2 years. While, the other type which is the OAT type coolant should be replaced every 5 years.
Thus, Technician B is correct i-e IAT type coolant should be changed every 2 years.
