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A red blood cell typically carries an excess charge of about -2.5 × 10-12 C distributed uniformly over its surface. The red blood cells can be modeled as spheres approximately 7.0 ?m in diameter and with a mass of 9.0 × 10-14 kg. How many excess electrons does a typical red blood cell have?
Does the mass of the extra electrons appreciably affect the mass of the cell? To find out, calculate the ratio of the mass of the extra electrons to the mass of the cell without the excess charge.
What is the surface charge density on the red blood cell. Express your answer in units of C/m2 (THIS PART IS ALL I NEED HELP WITH)
A river ?ows at a speed vr = 5.85 km/hr with respect to the shoreline. A boat needs to go perpendicular to the shoreline to reach a pier on the river's other side, determine the width of the river
Judy (mass 45.0 kg), standing on slippery ice, catches her leaping dog, Use the conservation of momentum to find the speed of Judy and her dog after the catch
What would be the fundamental frequency on a piece of the same string that is twice as long and has four times the tension
A projectile is fired with muzzle speed 150m/s, Where does the projectile hit the ground with what speed
Identical point charges of +2.4 ?C are fixed to diagonally opposite corners of a square. A third charge is then fixed at the center of the square, Find the sign and magnitude of the third charge
On a hot day, the temperature of a road surface may rise to over 50 degrees C. calculate the net radiation flux from the road to the air
A point P is on a rim of a wheel of radius 2.0m. At time t=0 wheel is at rest and P is on the x-axis. The wheel undergoes a uniform angular acceleration of 0.01 rad/s2 about the center O. Find out the time t, when P returns to an original position on..
Consider a bright star in our night sky. Assume its distance from Earth is 89.4 light-years (ly) and its power output is 4.00 multiply.gif 1028W, Find the intensity of the starlight at the Earth
You are a professional frontier re-enactor who specializes in making lead shot. To do this you put 1.3 kg of ice into 1.3 kg of water, both at 0 C, into an insulated bucket.
A boat moves relative to water with a velocity which is n =2 times less than the river flow velocity. At what angle to the stream direction should the boat move to minimize drifting.
A 990-kg sports car collides into the rear end of a 2100-kg SUV stopped at a red light. The bumpers lock, the brakes are locked, What was the speed sports car at impact
The current in a 1.70mm Ã? 1.70mm square aluminum wire is 1.80A. compute the electron drift speed
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