Download presentation

Presentation is loading. Please wait.

Published byKassidy Gailey Modified over 2 years ago

1
BIOL/PHYS 438 ● Introductions: Jess, Jeremy, Alex & You! ● Logistics & Procedures: Syllabus & Website Website ● Mini-Lecture (Ch. 1: Introduction) ● Assignment 1: METABOLISM Assignment Participatory Experiment: Hebb Stairs

2
PEOPLE ● Jess Brewer ( Boye Ahlborn) Henn 320A, 2-6455, jess@physics.ubc.cajess@physics.ubc.ca ● Jeremy Goldbogen ( John Gosline) Biosci 3475, 2-2373, jergold@zoology.ubc.cajergold@zoology.ubc.ca ● Alex Weber (TA) AMPEL 143, 2-5244, aweber@physics.ubc.caaweber@physics.ubc.ca ● You (See Assignment 1): Please Email us a brief explanation of who you are and why you are taking BIOL/PHYS 438!Email us

3
BIOL/PHYS 438 Logistics & Procedures: Syllabus & WebsiteWebsite

4
Ch. 1: Information, Matter & Energy ● “Life is remembering the form as matter flows through it.” - Thomas Mann Enormous complexity! ● “Physics: a wise choice of approximations & corrections.” - Jess Brewer Implausible simplicity. ● “Science is the belief in the ignorance of experts.” - Richard Feynman “Try and see.” The proof of the pudding is in the eating. ● The Physicist will try to make up simple models based on rigourous definitions and precise measurements. ● The Zoologist will acquaint him with reality. ● Perhaps we will get somewhere this way.

5
Notation: a few symbols X = Any abstract quantity dX = An infinitesimal change in x ΔX = A finite change in x t = Time [ s ], x,y,z,d,r,R = Distances [ m ] (usually) M = Mass [ kg ] U = Energy [ J ] (usually potential energy) K = Kinetic energy [ J ] W = Mechanical Work [ J ] P = dW /d t = Power [ W ] H = Helmholtz Free Energy [ J ] (usually chemical) Q = Heat energy [ J ] h = Mechanical efficiency of a heat engine G = Metabolic rate [ W ]

6
Conservation Laws in Physics Some things are rigourously conserved: ● kinetic energy K + potential energy U + m c 2 ● electric charge q Other things are approximately conserved: ● mass M ● work and energy W + K + U Other things are not conserved at all: ● entropy σ or S = k B σ ● temperature T = (dS / dU ) -1

7
Physics Model of an Animal ΔM in ΔM out ΔH in ΔW out ΔQ out ΔM stored ΔH stored ΔM in = ΔM stored + ΔM out ΔH in = ΔW out + ΔH stored + ΔQ out In steady-state, ΔM stored = 0 and ΔH stored = 0 ● Mechanical efficiency h = ΔW out / ΔH in ● Resting Metabolic Rate G 0 = minimum dH in /dt to stay alive.

8
Measuring G 0 ΔH in

9
Allometry: how things scale with mass log G 0 log M Kleiber, 1932

10
Allometry: Ahlborn, 2004 (Fig. 1.7, p. 12) G0G0 M

11
Allometry G0G0 M West & Brown, J. Exp. Biol. 208, 1575-1592 (2005).

12
Improved Model (but still just a model!)

13
Let's go do an Experiment!Let's go do an Experiment! Let's go do an Experiment in Allometry ! (Hebb Staircase Olympics)

14
Newton's Second Law: F = m a = dp/dt ≡ p [Dot Notation for Time Derivatives] Time Integral: ∫ F(t) dt = ∆p [Impulse changes Momentum] Dot Product with r & Path Integral: ∫ F(r) dr = ∆(½ mv 2 ) [Work changes Kinetic Energy] Cross Product with r : r x F ≡ Γ = r x p = L [Torque changes Angular Momentum] The Emergence of Mechanics (a mathematical fantasy)

Similar presentations

OK

10 - 1 KINETICS OF PARTICLES: ENERGY AND MOMENTUM METHODS s2s2 A1A1 A2A2 A s1s1 s drdr F ds Consider a force F acting on a particle A. The work of F.

10 - 1 KINETICS OF PARTICLES: ENERGY AND MOMENTUM METHODS s2s2 A1A1 A2A2 A s1s1 s drdr F ds Consider a force F acting on a particle A. The work of F.

© 2018 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on power transmission drives Ppt on psu in india Ppt online downloader for games Ppt on save environment image Ppt on fuel cell Ppt on power supply Ppt on index numbers excel Ppt on communist party of india Ppt on mind reading machine Ppt on condition based maintenance plus