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An electric dipole consists of charges +2e and -2e separated by 0.53 nm. It is in an electric field of strength 4.60 106 N/C. Calculate the magnitude of the torque on the dipole when the dipole moment has the following orientations. (a) parallel to the field (b) perpendicular to the field (c) antiparallel to the field
Under some circumstances, a star can collapse into an extremely dense object made mostly of neutrons and called a neutron star. find the angular speed of the neutron star
A lighter-than-air spherical balloon and its load of passengers and ballast are floating stationary above the earth. determine how much weight must be dropped overboard to make the balloon rise 122m in 23 s
a small ball bearing is illuminated with blue light from an argon ion laser (4880 A.) What is the diameter of the ball bearing
A car of mass 930 kg is traveling over the top of a hill, If the hill has a radius of curvature of 38 m and the car is traveling at 13 m/s, what is the normal force between the hill and the car at the top of the hill
A 180g block hangs from a spring with spring constant 6.0 N/m. At the block is 31cm below the equilibrium point and moving upward with a speed of 98.0cm/s. What is the block's position at t = 9s.
An object has a kinetic energy of 310 J and a momentum of magnitude 22.1 kg · m/s. Find the mass of the object
A geological survey ship mapping the floor of the ocean sends sound pulses down from the surface and measures the time taken for the echo to return. How deep is the ocean at a point where the echo time (down and back) is 7.07 s
A proton moves through a magnetic field at 25.5% of the speed of light. find the magnitude of the magnetic force acting on the proton
A small but measurable current of 7.4 x 10-10 A exists in a copper wire whose diameter is 2.9 mm, calculate the current density and electron drift speed
An 80 kg skydiver falls through air with a density of 1.15 kg/m3 . Assume that his drag coefficient is C=0.57. What are the terminal speeds in both cases
A capacitor has parallel plates of area 12cm^2separated by 2.5 mm. The space between the plates is filled with polystyrene (K=2.6,Em=2.0*10^7 V/m). Find the permittivity of polystyrene
The Earth's orbit has a radius of 1.52·1011 m, and that of Mercury has a radius of 6.98·1010 m. What is the length of a vector from Earth to Mercury
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