subject
Physics, 12.11.2019 04:31 bluebunny1231999

Energy is conventionally measured in calories as well as in joules. one calorie in nutrition is one kilocalorie, defined as 1 kcal = 4 186 j. metabolizing 1 g of fat can release 9.00 kcal. a student decides to try to lose weight by exercising. he plans to run up and down the stairs in a football stadium as fast as he can and as many times as necessary. to evaluate the program, suppose he runs up a flight of 95 steps, each 0.150 m high, in 63.0 s. for simplicity, ignore the energy he uses in coming down (which is small). assume that a typical efficiency for human muscles is 20.0%. therefore when your body converts 100 j from metabolizing fat, 20 j goes into doing mechanical work (here, climbing stairs). the remainder goes into extra internal energy. assume that the student's mass is 74.0 kg.(a) how many times must the student run the flight of stairs to lose 1.00 kg of fat? times(b) what is his average power output, in watts and horsepower, as he runs up the stairs? whp(c) is this activity in itself a practical way to lose weight?

ansver
Answers: 3

Other questions on the subject: Physics

image
Physics, 22.06.2019 02:00, apalacios3503
Which safety measures should you follow during a thunderstorm? check all that apply. (a) avoid touching anything that conducts electricity. (b) avoid touching a person who has been struck by lightning. (c) go outside. (d) keep your computer turned off. (e) stay out of water. (f) stay inside.
Answers: 2
image
Physics, 22.06.2019 04:30, cicimarie2018
Ameter stick is pivoted at the 0.50-m line. a 3.0-kg object is hung from the 0.15-m line. where should a 5.0-kg object be hung to achieve equilibrium (the meter stick oriented horizontal and motionless)?
Answers: 1
image
Physics, 22.06.2019 04:40, ortega103
Steam enters an adiabatic diffuser at 150 kpa and 1208c with a velocity of 550 m/s. determine the minimum velocity that the steam can have at the outlet when the outlet pressure is 300 kpa.
Answers: 3
image
Physics, 22.06.2019 05:10, dre8343
Which best represents the law of conservation of mass ?
Answers: 3
You know the right answer?
Energy is conventionally measured in calories as well as in joules. one calorie in nutrition is one...

Questions in other subjects:

Konu
Mathematics, 05.03.2021 01:00