PHL100Y1 Lecture Notes - An Enquiry Concerning Human Understanding

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lemonminnow931

8 Mar 2011

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Document Summary

Hume lists 3 possibilities: from observing things cannot get it from seeing things in the world. Only see cause of conjunctions, do not see the cause of links form the world: know about causality from our experience of power over our own bodies. We do not experience the power, because its not true the mind has power over the body, e. g. wanting to grow hair instantly. It is a discovered fact, not too hard to imagine things. Mind is not at all good at controlling the sentiments. This must be where impression of necessary connection comes fromit is the customary transition from a to belief of b. Official solution - feeling of compulsion comes with the transition. With a comes the thought of b; cannot resist the thought of b source of idea with necessary connection. the sentiment that accompanies it, not the transition. The association of ideas from one thing we associate the other.

Related Questions

A rifle with a weight of 35 N fires a 4.5 g bullet with a speed of240 m/s.

a)find the recoil speed of the gun in m/s
b)If a 650 N man holds the rifle firmly against his shoulder, findthe recoil speed of the man and rifle in m/s.

A 715 N man stands in the middle of a frozen pond of radius 4.0 m.He is unable to get to the other side because of a lack of frictionbetween his shoes and the ice. To overcome this difficulty, hethrows his 1.2 kg physics textbook horizontally toward the northshore at a speed of 4.0 m/s. How long does it take him to reach thesouth shore? (in seconds)

A 75.0 kg ice skater moving at 9.00 m/s crashes into a stationaryskater of equal mass. After the collision, the two skaters move asa unit at 4.50 m/s. If the impact time is 0.115 s, what are themagnitudes of the average forces experienced by each skater duringthe collision?

Force experience by moving skater in N.

Force experience by stationary skater in N.

The dominant form of drag experienced by vehicles (bikes, cars, planes, etc.) at operating speeds is called form drag. It increases quadratically with velocity (essentially because the amount of air you run into increases with v and so does the amount of force you must exert on each small volume of air). Thus ,where A is the cross-sectional area of the vehicle and Cd is called the coefficient of drag.

Consider a vehicle moving with constant velocity
a)Find the power dissipated by form drag.

b) A certain car has an engine that provides a maximum power P₀. Suppose that the maximum speed of the car, v₀, is limited by a drag force proportional to the square of the speed (as in the previous part). The car engine is now modified, so that the new power P₁ is 10 percent greater than the original power (P₁=110%P₀).

Assume the following:

The top speed is limited by air drag.
The magnitude of the force of air drag at these speeds is proportional to the square of the speed.

By what percentage, (v₁−v₀)/v₀, is the top speed of the car increased?