GGRB02H3 Lecture 8: (Global) Sense of Place

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blueserval947

6 Mar 2012

School

UTSC

Department

Geography

Course

GGRB02H3

Professor

Rajyashree Narayanareddy

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Document Summary

Space doesn"t matter because of the way in which capitalism has evolved. How should we think about space if place does not matter anymore. New phase in our world/ new understanding of space: everything is speeding up (dinner comes from produce sourced around the world) This was characterized by marx as the annihilation of space by time: space is no longer a constraint because of travel and technological advances. Idealized notions of place : inhabited by communities sense of security in these places: community and place are taken to be co-terminus, reactionary notions of place (xenophobia) Keeping others out resulting in different kinds of mobility. Can place be progressive and outward looking? (central question: query time-space compression (its ethnocentricity and causes, formal definition of time-space compression on page 147. Does everybody experience time-space compression and if so how: different experiences of space and place between people. Do we all benefit from time-space compression? i. e. people in prison, poor people.

Related Questions

Materials fracture when the force per unit area, called STRESS,exceeds a critical value. In general, the critical stress dependson the direction as well as the magnitude of the force. Forexample, bones break differently when subjected to torsional(twisting) stress than when subjected to compressional (orsqueezing) stress. Let us consider compressional stress. Wet humanbone for 20-39 year olds has an ultimate compressive strength of ~16x104Ncm2 [8]. Consider a person who falls from a height to theground. Upon landing, the person's kinetic energy is converted towork. If the person decelerates over a distance h, we can estimatethe average force during the collision by

If a person lands stiff-legged on a hard surface and doesn'tbounce, the deceleration occurs over a very short distance, h ~ 1cm. Since the force is transmitted up the leg, the stress isgreatest where the cross-sectional area is least, i.e., the tibiajust above the ankle [8].
The following lists some different conditions that may occur duringlanding and physical explanations for why they make bone fracturefrom a fall more or less likely [8]:

(a) bounce [more likely. The impulse is twice as large for anelastic collision as for an inelastic collision.]
(b) bent knees [less likely. Bending the knees increases the timeand distance over which deceleration occurs, which reduces theforce.]
(c) landing in loose earth or sand [less likely. This increases hwhich reduces F.]
(d) turning the body to land on the side [less likely. Thisincreases h. It also distributes the force widely over the body(increases A), thereby reducing the stress.]

So, why can a properly executed karate kick break a concrete blockwithout fracturing bones [16]? First, bone is a very strongmaterial. Its ultimate compressive strength is approximately 40times larger than concrete. Second, contact is made with the edgeof the foot. This concentrates the force into a small area of thetarget and reduces the likelihood of bending a bone to the point offracture. Third, the collision with the target is essentiallyinelastic and extends over several milliseconds, so the peak force,though large, does not exceed the strength of the bone. If A(cross-sectional area of the tibia) ~ 3.3 cm2, compute how far a 69kg person can fall and land stiff-legged on both legs withoutbreaking a bone. Assume F is split evenly between two legs. (Hint:F<or =2(theta)A )

A large pan is filled to the top with oil of densityÏ_o. A plastic cup of mass mc, containing a sample ofknown mass ms, is placed in the oil so that the cup and samplefloat, as shown above. The oil overflows from the pan is collected,and its volume is measured. The procedure is repeated with avariety of samples of different mass, and the pan is refilled eachtime.

a) On the dot below that represents the cup-sample system, drawtand label the forces (not component) that act on the system whenit is floating on the surface of the oil.

b) Derive an expression for the overflow volume V_o(the volume of oil that overflows due to the floating system) interms of Ï_o, m_s, m_c, andfundamental constants. If you need to draw anything other than whatyou have shown in part (a) to assist in your solution, use thespace below. Do NOT add anything to the figure in part (a).

PS: i need full detail explanation on how you guys works out onthe calculation, don't jump steps please.
PS2: im finding the OVERFLOW VOLUME after i put the mass and thecup in the water, not the total volume, it you think they are thesame, please explain your thought.

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to helper SRG: The answer that you give me doesn't make sense tome

You said "Fg = Fb, therefore(m_c+m_s)g=ÏV_og,"
but the confusing part is that you said "thus,overflow volume is V=(mc+ms)/g
The [g] should cancel out each other and left theequation with V=(mc+ms)Ï
I want a explanation of your answer, i think you jumpa couple steps that's importantto the whole question

1.As a rocket rises its acceleration increases. Why does thishappen? (assume that the acceleration due to gravity and airresistance are nearly constant during the ascent)

2. If the head of the hammer is loose, and you wish tighten it bybaging it against the top of a work benchm why si it bettwee tohold it with the handle down ( as indicated in the diagram to theright) than to hold with the head down?

3. If a four-engine jet accelerate down a runway at 2.0m/s^2 andone of its engines suddenly fails, how much acceleration will theramaining three produce? ( asuume that all four engines areidentical.)

4. If an elephant was chasing you, its enourmous mass would be mostthreatning, but if made a quick turn, its mass would be to youradvantage. Why?

5. Many automobile passengers waiting at traffic lights havesuffered nech injuries when their cars were struck from behind.Explain why this happens, how can head rests reduce the severity ofthis type of injury?

6. Some people used to think that a spaceship could not maneuverover it left the earths's atmosphere because it would have no airto push against, obiviously, this thinking must be wrong sincerocket engines have been used to steer vehicles through space sincethe late 1950s. how does a rocket engine manage to apply a force toa spaceship in the vacuum of outer space?

7. If a bicycle and a truck have a head-on collision, which vehicleexperiences the greater force? which undergoes the greateraccleration?

8.two closed containers look the same, but one is tightly packedwith lead and the other loosely packed with feathers. how could youdetermine which was which if you and the containers were weightlessin outer space?

9. Two teams are involved in a tug-of-war. why is it wrong to saythat the team that pulls the hardest wins? what force realllydetermines who wins?

10. The photo on the website shows a physics teacher sandwichebetween two bed of nails. A second physics teacher is pulverizing acement block on top of the upper bed with a sledgehammer. If thecement block were replaced with a smaller brick, would thedemonstration be more or less safe?

GGRB02H3 Lecture 8: (Global) Sense of Place

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