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Some cell walls in the human body have a layer of negative charge on the inside surface and a layer of positive charge of equal magnitude on the outside surface. Suppose that the charge density on either surface is ± 0.50×10?3 C/m2, the cell wall is 5.00nm thick, and the cell-wall material is air. A typical cell in the human body has a volume of 10?16m3 . Estimate the total electric-field energy stored in the wall of a cell of this size. (Hint: Assume that the cell is spherical, and calculate the volume of the cell wall.)
A roller-coaster car moves 198 ft horizontally and then rises 143 ft at an angle of 30° above the horizontal. It then travels 143 ft at an angle of 40° downward
find the tangential and centripetal components of the net force exerted on a car (by the ground) when its speed is 38 m/s, and it has accelerated to this speed from rest in 9.5 s on a curve of radius 370 m. The car's mass is 1000 kg.
Weight of a box is 150 pounds. The horizontal force required to move the box is 70 lb. What horizontal force is required if 60lbs is added to box.
What is the radius r of the iron ball?
A charge particle of mass .0020kg is subjected to a 6 T magnetic field which is acts as a right angle to its motion. if the particle moves in a circle of radius .20m at a velocity of 5.0 m/s. what is the magntiude of the charge on the particle.
You have a total charge Q=16fC. An amount q is to be put in one sphere, What value of q maximizes the electrostatic force between the two spheres
A charged rod carrying a negative charge is brought near two conducting spheres that are in contact with each other but insulated from the ground. If the two spheres are then separated, what charge does B have, positive, negative or neutral?
A motorboat heads due east 13.3 m/s across a river that flows toward the south at a speed of 4.5m/s. Illustrate what is the magnitude of the resultant velocity relative to an observer on the shore?
A cup of coffee is on a table in an airplane flying at a constant altitude and a constant velocity. The coefficient of static friction between the cup and the table is 0.170 .
There are approximately 120 million TVs in the United States. Each uses, on average, 75 W of power, how much money is spent every day in keeping the TVs turned on
A runner accelerates to a velocity of 4.15 m/s due west in 1.50s. His average acceleration is 0.640 m/s^2, also directed due west. What was his velocity when he began accelerating.
A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 15.0 m/s due north relative to the water. Illustrate what is the velocity of the boat relative to shore?
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