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lana [24]
3 years ago
7

Sam is walking through the park. He hears a police car siren moving on the street coming toward him. What happens to the siren s

ound as it approaches and then passes Sam?
a. As the siren approaches Sam, the frequency of sound waves from the siren increase. As the police car continues past Sam, the sound waves decrease in frequency.
b. As the police car approaches Sam, sound waves from the siren remain constant. As the car continues past Sam, the sound waves decrease in frequency.
c. As the police car approaches Sam, the frequency of sound waves from the siren decrease. As the car continues past Sam, the sound waves increase in frequency.
d. As the police car approaches Sam, the frequency of the sounds waves from the siren increases and continues to increase as the car passes and moves away from Sam.
Physics
1 answer:
LiRa [457]3 years ago
5 0
The answer is a.

This is called the Doppler Effect. As a source of sound approaches a stationary object, the frequency observed by the object increases, and as the source of sound passes the stationary object, the frequency decreases.
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Please help me and show work, will mark Brainliest!!
Licemer1 [7]

Speed is distance over time, learn that formula and look at the image

3 0
3 years ago
Se golpea una pelota de golf de manera que su velocidad inicial forma un ángulo de 45° con la horizontal. La pelota alcanza el s
nordsb [41]

Answer:

42m/s

6.06s

Explanation:

To find the initial velocity and time in which the ball is fling over the ground you use the following formulas:

x_{max}=\frac{v_o^2sin(2\theta)}{g}\\\\x_{max}=vt_{max}

θ: angle = 45°

vo: initial velocity

g: gravitational constant = 9.8m/s^2

x_max: max distance = 180 m

t_max: max time

by replacing the values of the parameters and do vo the subject of the first formula you obtain:

v_o=\sqrt{\frac{gx_{max}}{sin(2\theta)}}\\\\v_o=\sqrt{\frac{(9.8m/s^2)(180m)}{sin(2(45\°))}}=42\frac{m}{s}

with this value of vo you calculate the max time:

t_{max}=\frac{x_{max}}{v}=\frac{x_{max}}{v_ocos(45\°)}\\\\t_{max}=\frac{180m}{(42m/s)cos(45\°)}=6.06s

hence, the initial velocity of the ball is 42m/s and the time in which the ball is in the air is 6.06s

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TRANSLATION:

Para encontrar la velocidad inicial y el tiempo en el que la pelota está volando sobre el suelo, use las siguientes fórmulas:

θ: ángulo = 45 °

vo: velocidad inicial

g: constante gravitacional = 9.8m / s ^ 2

x_max: distancia máxima = 180 m

t_max: tiempo máximo

reemplazando los valores de los parámetros y haciendo el tema de la primera fórmula que obtiene:

con este valor de vo usted calcula el tiempo máximo:

por lo tanto, la velocidad inicial de la pelota es de 42 m / sy el tiempo en que la pelota está en el aire es de 6.06 s

4 0
3 years ago
What is the mass of an object that weighs 686N on Earth?
Oxana [17]

Answer:

70 kg is the mass of the object

Explanation:

This question can be solved with this simple formula:

Weight force = mass . gravity

686 N = mass . 9.8 m/s²

686 N /  9.8 m/s² = mass → 70 kg

Note → 1N = 1 kg . m / s²

8 0
3 years ago
what will happen when two wave pulses that are the same size approach one another from opposite directions?
xenn [34]
When two or more waves meet, they interact with each other. The interaction of waves with other waves is called wave interference. Wave interference may occur when two waves that are traveling in opposite directions meet. The two waves pass through each other, and this affects their amplitude.
5 0
3 years ago
The mass of a giraffe on the moon would be
larisa [96]
Mass is an independent quantity. It can neither be created nor be destroyed. So mass of giraffe will not change on moon.
4 0
3 years ago
Read 2 more answers
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