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In the human body, blood vessels can dilate, or increase their radii, in response to various stimuli, so that the volume flow rate of the blood increases. Assume that the pressure at either end of a blood vessel, the length of the vessel, and the viscosity of the blood remain the same, and determine the factor R(dilated)/R(normal) by which the radius of a vessel must change in order to double the volume flow rate of the blood through the vessel.
A family ice show is held at an enclosed arena. The skaters perform to music with level 85.0 dB. What is the combined sound level
A spherical water drop 2.9 ?m in diameter is suspended in calm air due to a downward-directed atmospheric electric field of magnitude E = 5240 N/C. How many excess electrons does it have
A 200 gram object moves horizontally and slams into a 500 gramobject connected to a 1 meter long massless string. find the period of oscillation of the conglomerate object
A heavy sled is being pulled by two people as shown in the figure. The coefficient of static friction between the sled and the ground is ?s = 0.571, and the kinetic friction coefficient is ?k = 0.467. what is the sled\'s acceleration
if a 1500kg car is driven in sand at 5m/s, the coefficient of rolling friction is 0.06. What is the propulsion force need tot keep the car moving
John is sitting ( at rest) at the top of a slide that is inclined 25 deg with respect to the horizontal. how much does the thermal energy increase during John's trip down the slide
your refrigerator has a mass of 124.7 kg including the food in it. it is standing in the middle of your kitchen and you
Suppose a man's scalp hair grows at a rate of .31 mm per day. What is this growth rate in feet per week
The change in the kinetic energy of the system
A diver springs upward from a three-meter board. At the instant shecontacts the water her speed is 8.90m/s, How much time does she spend in the air
Large meteors can impact the earth with speeds of 80,000 km/h. If such a meteor were to impact at a point on the plane of Earth's equator, calculate the mass of the meteor
A 0.150-kg glider is moving to the right on a frictionless,horizontal air track with a speed of 0.80 m/s. Find the final velocity (magnitudeand direction) of each glider if the collision is elastic
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