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3 years ago

According to the Doppler Effect, which statement is true about a sound as it approaches you and then moves away.

Physics

2 answers:

Anarel [89]3 years ago

8 0

A) As the source approaches you, the sound waves are compressed so the pitch of the noise increases.

Fiesta28 [93]3 years ago

6 0

As the source approaches you, the sound waves are compressed, so
the pitch of the sound is higher than what the source is actually emitting.

Then, after it passes you and begins moving away, the sound waves
are stretched, so the pitch of the sound is lower than what the source
is actually emitting.

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Explain between the cause of high probability of accidents of loaded vehicles in over speed on the basis of the first law of mot

Setler [38]

Cause of high probability of accidents of loaded vehicles in over speed effected by momentum on the basis of first law of motion.

<h3>What does Newton's first law say?</h3>

When we are standing inside a bus and it brakes abruptly, due to inertia, we are thrown forward. When a car is going around a curve it is necessary for a force to act, otherwise the car will go in a straight line.

the cause of high probability of accidents of loaded vehicles in over speed occurs large amount of momentum.

See more about momentum at brainly.com/question/24030570

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8 0

2 years ago

A student pushes a laptop cart down the hallway by applying 20 Newtons force. The student pushes it 10 meters and

noname [10]

Answer:

None.

Explanation:

By definition, work is a process that it happens when an applied force

causes an object to change its position, i.e. to have a displacement.

Since the laptop cart is at rest while he stops at the water fountain, no

net work done is on the laptop cart.

4 0

3 years ago

An ac voltage, whose peak value is 250 V , is across a 330-Ω resistor. Part A What is the peak current in the resistor?

Wittaler [7]

Answer:

Peak current is 0.75 A

RMS voltage is 176.77 V

RMS current is 0.53 A

Explanation:

Peak current is

$I=\frac{V}{R} \\\\I=\frac{250}{330}\\I=0.75 A$

RMS voltage is

$V_{RMS}=\frac{V}{\sqrt{2} } \\V_{RMS}=\frac{250}{\sqrt{2} }\\V_{RMS}=176.77 V$

RMS current is

$I_{RMS}=\frac{V_{RMS}}{R} \\I_{RMS}=\frac{176.77}{330} \\I_{RMS}=0.53 A$

7 0

3 years ago

Calculate the difference in blood pressur toes of a human by treating the blood as a static fluid (this is a very crude approxim

FromTheMoon [43]

Answer:

19.822 kPa

Explanation:

$\rho$ = Density of blood = 1060 kg/m³

g = Acceleration due to gravity = 10 m/s²

h = Height of person = 187 cm

The pressure difference would be given by the relation (as there are no other forces to be considered)

$\Delta P=\rho gh\\\Rightarrow \Delta P=1060\times 10\times 1.87\\\Rightarrow \Delta P=19822\ Pa$

The difference in blood pressure is 19.822 kPa

3 0

3 years ago

Mo Farah won the 10,000 meter race in the 2012 Olympics with an official time of 27 minutes, 30.42 s . To the correct number of

seropon [69]

Speed=distance/time
distance = 10,000 m
time= 27 min 30.42s but we need to convert that completely to seconds
(27x60)+30.42= 1650.12 rounded to 1650
speed=10,000/1650.12
speed=6.059063
Because when we do sig dig we round to the least number of digits we would round to 4 because 1650.12 gets rounded to 1650
so 6.059 m/s

4 0

2 years ago