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Chapter 37: Q98P (page 1152)

An astronaut exercising on a treadmill maintains a pulse rate of 150 per minute. If he exercises for 1.00 h as measured by a clock on his spaceship, with a stride length of 1.00 m/s, while the ship travels with a speed of 0.900c relative to a ground station, what are (a) the pulse rate and (b) the distance walked as measured by someone at the ground station?

Short Answer

Expert verified

(a) The pulse rate at ground station is 65.4pulsemin.

(b) The distance measured at ground station is1569.2m .

Step by step solution

01

 Step 1: Identification of given data

The pulse rate of astronaut on treadmillis ro=150pulsemin

The duration for exercise for astronaut is t=1h=3600s.

The stride length is u=1ms

The speed of ship is v=0.900c.

The pulse rate is the frequency of heart rate in every minute. Each pulse is made from one compression and one expansion of heart.

02

 Step 2: Determination of pulse rate at ground station 

(a)

The pulse rate at ground station is given as

r=ro1-vc2

Here, c is the speed of light and its value is 3脳108ms.

Substitute all the values in the above equation.

r=150pulsemin1-0.900cc2r=65.4pulsemin

Therefore, the pulse rate at ground station is 65.4pulsemin.

03

Determination distance measured at ground station

(b)

The distance measured at ground station is given as:

d=uto1-vc2

Substitute all the values in the above equation.

d=1ms3600s1-0.900cc2

d=1569.2m

Therefore, the distance measured at ground station is1569.2m. .

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