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3 years ago

Why is it that teens that are more physically active need a significantly different dietary

Health

2 answers:

NemiM [27]3 years ago

7 0

Answer:

because of their metsbolism

Explanation:

people who are more physically active tend to have a faster metabolism than those who are not. thus, their bodies break down foods faster and process those nutrients at a quicker pace than the latter.

Simora [160]3 years ago

7 0

Individual, social, and environmental factors are associated with physical activity among adolescents

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A 5 Mhz ultrasound beam in soft tissue reflects off an object 5 cm deep. The time required to receive the echo at the transducer

miss Akunina [59]

Answer:

The time required to receive the echo at the transducer is $t=3.34\times 10^{-10}\ s$

Explanation:

Frequency of ultrasonic beam, f = 5 MHz

It reflects off an object 5 cm deep.

We need to find the time required to receive the echo at the transducer. The ultrasonic wave is an electromagnetic wave. it moves with a speed of light. Let t is the time taken by the wave to go once.

So,

$t=\dfrac{d}{c}$

$t=\dfrac{0.05\ m}{3\times 10^8\ m/s}$

$t=1.67\times 10^{-10}\ s$

Time to receive the echo at the transducer gets doubled. So,

$t=3.34\times 10^{-10}\ s$

Hence, this is the required solution.

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