# PH120

Physics Innovation and Entrepreneurship Mechanical Energy Module This module was developed at Loyola University Maryland, based on support by NSF IUSE program under NSF award number 1625089. Work, Energy and Power Problem: Approximately, what is your change in gravitational potential energy when you climb a

set of stairs? UUg = m g Uy What is your mass? m ~ 75 kg What is the height of a flight of stairs? Look it up! Uy ~ 4 m

UUg ~ (75 kg)(10 N/kg)(4 m) = 3000 J Work, Energy and Power Problem: Approximately, how much work do you do when you climb a set of stairs? W = UUg ~ 3000 J Note that you do this work on yourself. Work, Energy and Power

Problem: Approximately, what is your power output as you (leisurely) climb a set of stairs? P = W/tUt How long does it take to leisurely climb a set of steps? Ut ~ 15 s. P ~ (3000 J)/(15 s) = 200 W

Work, Energy and Power Problem: Suppose you climb the same distance on a stair-climbing machine. Is the work you do the same? Seems like it must be. Where does the energy go? Energy is lost to thermal energy (the room warms up). Can you think of any ways you could use what

we have just learned? Power output ~ 200 Watts Useful Applications of Humangenerated Mechanical Power Power electrical devices Wait until next semester electrical energy and power One example: The Monstrosity Bike Any other needs that could be addressed?

. . . Useful Applications of Humangenerated Mechanical Power Sub-Saharan Africa Where is the economy focused? 80% Sub-Saharan Africans are farmers Tanzania half GDP from farming and

80% of employment from farming Uganda 85% of economic output based on farming Irrigated agriculture has greatest potential impact Useful Applications of Humangenerated Mechanical Power Could we develop a human-powered pump for irrigation in sub-Saharan Africa?

The thousand dollar question: Would you invest \$1000 in my company? Initially, this is a feasibility question. Feasibility of a Human-powered Irrigation Pump What do we need to know/assume/estimate? How much land (acres)?

How much water per acre? How high must we lift the water? How long can a person operate a pump? How do we determine these things? Make assumptions and/or use Google! Feasibility of a Human-powered Irrigation Pump How much land?

1 acre How much water per acre? One approximation: 20,000 liters How high must we lift the water? 10 m seems reasonable (from a well?) How long can a person operate a pump?

Two hours? Feasibility of a Human-powered Irrigation Pump Lets ask: How long does it take to pump enough water to irrigate one acre? 1 acre How much water per acre? One approximation: 20,000 liters

How high must we lift the water? 10 m seems reasonable (from a well?) Feasibility of a Human-powered Irrigation Pump One liter of water has a mass of 1 kg, so the work required to raise 20,000 liters 10 meters is W = mgh = (20,000kg)(10N/kg)(10m)

= 2 x 106 J If we do 200 J or work every second, the required time is t = (2 x 106 J)/(200 J/s) = 104 s = 2.8 hours So this seems feasible. Would you invest \$1000? Practicality of a Humanpowered Irrigation Pump Other mechanical issues:

Pump design Friction (efficiency) Materials Locally available? Repairs/spare parts Cost Can farmers afford it?

Can some profit be made? Martin Fisher and Kickstart Poverty to Prosperity in Just One Season http://kickstart.org/ https://www.youtube.com/watch?v=PCPRgOGFElY Kickstarts Technology History: Super MoneyMaker (1998)

Dual piston micro-Irrigation pump Can pump from 7m below to 7m above (or 200m horizontally) Weighs 45 pounds Waters 2 acres Efforts similar to walking Costs about \$95

Kickstart and Martin Fisher Awards and Honors Martin Fisher Design News Magazines Engineer of the Year, 2008 \$100,000 Lemelson MIT Award for Sustainability, 2008 OneWorld.net Person of the Year Award, 2008

Kickstart International Drucker Award for Nonprofit Innovation, 2008 Other interesting (?) ideas Would you invest your money? Pyramid Power Other interesting (?) ideas Would you invest your money?

Magnet Therapy Other interesting (?) ideas Would you invest your money? Solar Panel on a car roof PH491/CS491/EG491 Technical Innovation and Entrepreneurship Learn how to start with an idea and take it

through to a finished, marketable product Idea generation / Feasibility Intellectual property Business plan Financing Marketing patents

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