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A proton and an electron are fixed in space with a separation of 911 nm. Calculate the electric potential at the midpoint between the two particles. Find the magnitude and direction of the electric field at the same point. Find the potential and the magnitude of the force.
How fast would it be moving after it had fallen a distance of 0.010-m? (Assume that the gravitational force is constant over the distance of the fall, and that the star is not rotating.)
A hiker's trip consists of three segments. Path A is 9km long heading 60.0° north of east. Path B is 6.0km long in a direction due east. Path C is 5.0 km long heading 315° counter clockwise from east.
A piece of string 5.30 m long has a mass of 14 g. What must the tension in the string be to make the wavelength of a 128 Hz wave 120 cm.
The nucleus of an atom consists of protons and neutrons (no electrons). A nucleus of a carbon-12 isotope contains six protons and six neutrons.
Estimate the initial speed of that car assuming a level road.What would be the equilibrium temperature when a 252 block of copper at 275 is placed in a 136 aluminum calorimeter cup containing 807 of water at 14.90.
Suppose the peak of a particular star's spectrum occurs at about 6000 Å (Angstrom). (a) Use Wien's law to calculate the star's surface temperature. (b) If this star were a factor of four hotter, at what wavelength would its spectrum peak? In what ..
if the box is moving at a constant speed of 0.35m/s and the coefficient of kinetic friction is 0.12. What is the magnitude of F.
In order to clearly read a book 24 cm away, a farsighted girl needs an image to be 35 cm from her eyes. What focal length is necessary for lens in her eyeglasses.
An airplane accelerates down a runway at 3.20 m/s2, finally lifts off the ground Determine the distance traveled before takeoff?
A loudspeaker of mass 24.0 {rm kg} is suspended a distance of h = 1.40 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 3.70 {rm m}.
On a hot summer afternoon, Keith is out fishing in a rowboat when he decides to jump into the water and go for a swim, what is its velocity in the opposite direction after he jumps
A block of mass 4.0 kg is put on top of a block of mass M = 5.5 kg. To cause the top block to slip on the bottom one, while the bottom one is held fixed, a horizontal force of at least 16 N must be applied to the top block. The assembly of blocks is ..
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