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# Your friend's heart beats 18 times in 15 seconds when at rest. While running, your friend's heart beats 25 times in 10 seconds.

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Your friend's heart beats 18 times in 15 seconds when at rest. While running, your friend's heart beats 25 times in 10 seconds.

Question 1

a.  Find the heart rate in beats per minute at rest and while running.

While at rest, the heart rate is beats per minute. While running, the heart rate is beats per minute.

Question 2

b.  How many more times does your friend's heartbeat in 3 minutes while running than while at rest?

Your friend's heart beats more times while running.

Dec 10, 2019

#1
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18 beats/15 seconds   x  60 seconds/ 1 minute = 18 x60 /15 = 72 beats/min

25 beats / 10 sec x 60 sec/1 minute = 150 beats/min

150 beats / min x 3 min      -    72 beats/min x 3 min =

150 x 3       - 72 x 3 =

= 234 beats more

Dec 10, 2019
#2
+8806
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Your friend's heart beats 18 times in 15 seconds when at rest. While running, your friend's heart beats 25 times in 10 seconds.

Question 1

a.  Find the heart rate in beats per minute at rest and while running.

While at rest, the heart rate is beats per minute. While running, the heart rate is beats per minute.

Question 2

b.  How many more times does your friend's heartbeat in 3 minutes while running than while at rest?

Your friend's heart beats more times while running.

Das Herz deines Freundes schlägt im Ruhezustand 18 Mal in 15 Sekunden. Während des Laufens schlägt das Herz Ihres Freundes 25 Mal in 10 Sekunden.
Frage 1
a. Finden Sie die Herzfrequenz in Schlägen pro Minute in Ruhe und beim Laufen.
Im Ruhezustand beträgt die Herzfrequenz Schläge pro Minute. Während des Laufens beträgt die Herzfrequenz Schläge pro Minute.
Frage 2
b. Wie oft schlägt das Herz Ihres Freundes in 3 Minuten beim Laufen mehr als im Ruhezustand?
Das Herz deines Freundes schlägt beim Laufen öfter..

Hello Guest!

$$f_{re}=\frac{18}{15s}=1.2s^{-1}\\ f_{ru}=\frac{25}{10s}=2.5s^{-1}$$

1.a.

$$b_{re}=f_{re}\cdot t=1.2s^{-1}\cdot \frac{60s}{min}=72min^{-1}\\ b_{ru}=f_{ru}\cdot t=2.5s^{-1}\cdot \frac{60s}{min}=150min^{-1}$$

While at rest, the heart rate is 72 beats per minute. While running, the heart rate is 150 beats per minute.

2.b.

$$\Delta b_{3min}=\Delta f\cdot t=(2.5-1.2)s^{-1}\cdot 3min\cdot\frac{60s}{min}\\ \Delta b_{3min}=234$$

Your friend's heart beats more 234 times while running.

!

Dec 10, 2019