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Katen [24]
3 years ago
13

Police radar guns measure the speed of moving vehicles by transmitting electromagnetic waves at a vehicle and detecting a Dopple

r shift in the reflected wave. Suppose a police radar transmits at a frequency of 26.8 GHz and receives a wave reflected from a car moving toward the radar at 66.0 mph. Find the frequency shift
Physics
1 answer:
Naddika [18.5K]3 years ago
4 0

Answer:

Frequency shift, f = 5270.66

Explanation:

It is given that,

Velocity of the car, v = 66 mph = 29.50 m/s

Frequency transmitted by a police radar, F_s=26.8\ GHz=26.8\times 10^9\ Hz

Frequency shift is given by :

f=\dfrac{2vF_s}{c}

f=\dfrac{2\times 29.50\ m/s\times 26.8\times 10^9\ Hz}{3\times 10^8\ m/s}

f = 5270.66 Hz

So, the frequency shift is 5270.66 hertz. Hence, this is the required solution.

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A geologist is studying rock layers in an old river bed, and he finds a fossil of a fish and a horsetail rush in the same rock l
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Two forces,one of 12 N and another of 24 N,act on a body in such a way that they make an angle of 90degree with each other.Find
jok3333 [9.3K]

Answer:

26.83 N.

Explanation:

If the angle between two vector is 90°, to get the resultant, we use Pythagoras theorem.

a² = b²+c²......................... Equation 1

Where a = R = Resultant, b =  12 N, c = 24 N.

Substitute these values into equation 1

R² = 12²+24²

R² = 144+576

R² = 720

√R² = √720

R = 26.83 N.

Hence, the result of the two force is 26.83 N.

4 0
3 years ago
Light bulb is connected to a 110-V source. What is the resistance of this bulb if it is a 100-W bulb
masya89 [10]

Answer:

<h2>121ohms</h2>

Explanation:

Formula used for calculating power P = current * voltage

P = IV

From ohms law, V = IR where R is the resistance. Substituting V = IR into the formula for calculating power, we will have;

P = IV

P =(V/R)V

P = V²/R

Given parameters

Power rating of the bulb P = 100 Watts

Source voltage V = 110V

Required

Resistance of the bulb R

Substituting the given parameters into the formula for calculating power to get Resistance R;

P = V²/R

100 = 110²/R

R = 110²/100

R = 110 * 110/100

R = 12100/100

R = 121 ohms

<em>Hence, the resistance of this bulb is 121 ohms</em>

5 0
3 years ago
cup of hot chocolate has a spoon in it. How does the heat move from the hot chocolate to the metal spoon handle?
serg [7]

The heat moves from the hot chocolate to the handle of the spoon by a process called thermal conduction.

It is the transfer of heat energy from one object to another when they are in contact with eachother.

Hope this answers your question.

5 0
3 years ago
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