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26 Nov 2019

If cholesterol build-up reduces the diameter of an artery by15%,what will be the effect on the blood flow?

My professor gave us a similar problem relating to a hose inclass,however I cannot find a way to relate the two.

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Elin Hessel
Elin HesselLv2
7 Jan 2019

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

Desperately need help on this problem i have triedeverything!

A solar sail allows a spacecraft to use radiation pressure forpropulsion, similar to the way wind propels a sailboat. The sailsof such spacecraft are made out of enormous reflecting panels. Thearea of the panels is maximized to catch the largest number ofincident photons, thus maximizing the momentum transfer from theincident radiation.

For such spacecraft to work, the force from the radiation pressureexerted by the photons must be greater than the gravitationalattraction to the star emitting the photons. The critical parameteris the area density (mass per unit area) of the sail.

Consider a perfectly reflecting mirror oriented so that solarradiation of intensity I is incident upon, and perpendicular to,the reflective surface of the mirror. If the mirror has surfacearea A, what is F_rad, the magnitude of the average force due tothe radiation pressure of the sunlight on the mirror?
Express your answer in terms of the intensity I, the mirror'ssurface area A, and the speed of light c.

my answersreview part

To solve the second part of this problem you will need to know thefollowing:

* the mass of the sun, M_{\rm sun} = 2.0\times10^{30}\;{\rmkg},
* the intensity of sunlight as a function of the distance R fromthe sun,

I (sun)(R) = 3.2\times10^{25}\,\frac{1}{R^2}\;({\rm W/m^2}),
and
* the gravitational constant G = 6.67 \times 10^{-11}\; {\rmm^3}/({\rm kg}\cdot {\rm s^2})\;.

Part B
Suppose that the mirror described in Part A is initially at rest adistance R away from the sun. What is the critical value of areadensity for the mirror at which the radiation pressure exactlycancels out the gravitational attraction from the sun?

I found part A, but cannot find part B

In order to solve the problem you must refer to the first partwhich i already solved and I am 200% sure of the answers, however Iam stuck on the second part and I need help asap. Please do not getscared when you look at this problem and thank you soo much inadvance.

A wheel 75 meters in diameter is mounted vertically on an infinitefrictionless plane at the origin. The infinite frictionless planehas a grid of Cartesian coordinates on it. The moment of inertia ofthe wheel is mr^2. The mass of the wheel is 2000kg. There is anengine connected to the wheel that can produce a torque of 2.34x10^6 Nm. There is a 50 kg object attached to the circumference ofthe wheel that is attached to the wheel with a remote releasemechanism. The wheel is placed on the origin so that the plane ofthe wheel contains the point x=50 meters and y=86.8 m. The wheel ispositioned so that the object is just above the plane at the 6o'clock position. The engine is engaged and begins to apply thetorque to the wheel at 12:00 noon on March 1, 2011. The wheelbegins to rotate in the counterclockwise direction. The torque isapplied for 4 x 10^4 revolutions. At that point the object isreleased from the wheel and a 75 Newton motor accelerates theobject in the direction it is released. The motor is fired for 2.34x 10^4 seconds. (the following questions i have already answered)What is the angular velocity and rotational KE of the object justbefore it is released? (answer for that is 6.39 x 10^2 rad/sec and5.89 x 10^11 J). What angle does the path of the object make withthe x axis? (answer is 60.05 degrees). Where is the object on theinfinite frictionless plane when the motor stops (what are itscoordinates....answer is x=4.85x10^8m y=8.40x10^8m). What is thevelocity and linear KE of the object when the motor stops?(5.91x10^4 m/sec and KE= 8.73 x 10^10J). How much work was done onthe object up until the time the motor stopped? (8.73 x 10^10J).(Hint: the mass of the wheel is 2050 kg while the torque is appliedand the object is attached).

YEA I know what you are thinking at this moment. Difficult right?Please give it a chance and have faith in yourself. Here is thepart I had difficulty with:

After the engine stops firing the object is turned around so thatthe engine can be used to stop the object. The motor is fired atits rated thrust to stop the object. Unfortunately it malfunctionsand shuts down after an hour and the object coasts from then on. Atthe end of an hour of coasting it encounters a ramp that is 2000meters high and slopes up at an angle of 20 degrees. The objectclimbs the ramp and flies off the ramp into the air when it reachesthe end of the ramp. It strikes the plane and digs a crater 5meters deep in the plane and comes to a stop. How far from the endof the ramp does it land? Where does it land on the plane (as incoordinates)? What is the resultant velocity of the object and whatis the acute angle of the resultant velocity with the plane when itstrikes the plane? What is the KE of the object when it hits theplane? What date and time is it when the object lands on the plane?How much work was done on the object to stop it? How long did ittake to stop? What was the deceleration of the object in m/sec^2?What was the force on the object in Newtons to stop it?

If you are from MIT I have faith that you can do this. I am only ajunior in high school taking first year physics that is not evenAP. My teacher is from MIT and said he did this kind of stuff whenhe was there. Please please please help me! I'm desperate.

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