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1. Two alpha particles (helium nuclei), each consisting of two protons and two neutrons, have an electrical potential energy of 6.32 × 10-19 J. What is the distance between these particles at this time?
2. Two charges are located along the x-axis. One has a charge of 6.4 mC, and the second has a charge of -3.2 mC. If the electrical potential energy asso- ciated with the pair of charges is -4.1 × 10-2 J, what is the distance between the charges?
3. In a charging process, 1013 electrons are removed from a metal sphere and placed on a second sphere that is initially uncharged. Then the elec- trical potential energy associated with the two spheres is found to be -7.2 × 10-2 J. What is the distance between the two spheres?
4. A charge moves a distance of 2.0 cm in the direction of a uniform electric field having a magnitude of 215 N/C. The electrical potential energy of the charge decreases by 6.9 × 10-19 J as it moves. Find the magnitude of the charge on the moving particle. (Hint: The electrical potential energy depends on the distance moved in the direction of the field.)
A 20-N horizontal force pushes an object along a rough floor so that the object moves with a constant velocity of 7.0 m/s
Suppose a 31.7 kg child sits 1.38 m to the left of center on the same seesaw as the problem you just solved. Find the normal force acting at the pivot point
The human lungs can function satisfactorily up to a limit where the pressure difference between the outside and inside of the lungs is one-twentieth of an atmosphere. how far below the water can she swim
A satellite has a mass of 6079 kg, What would be the true weight of the satellite if it were at rest on the planet's surface
A 2.70-cm-high object is situated 18.5 cm in front of a concave mirror that has a radius of curvature of 8.06 cm. Calculate the location and the height of the image
A circular disk with the rectangular hole has a radius of 0.540 m and mass of 0.440 kg. It is suspended by a point on its perimeter. The moment of inertia about this point is I_p = 1.7×10-1 kgm2.
A loudspeaker of mass 22.0 {rm kg} is suspended a distance of h = 1.60 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 3.90 {rm m}.
Two trains on separate tracks move toward one another. Train 1 has a speed of 130km/hr and train 2 has a speed of 90km/hr. What is the frequency heard by the engineer on train
A zone plate is to be set up on an optical bench , where it will be used an an enlarging lens. find the focal length of the zone plate
question a 78.3 kg weight-watcher wishes to climb a mountain to work off the equivalent of a large piece of chocolate
A sound wave travels in air toward the surface of a freshwater lake and enters into the water. What is the wavelength in the water
A box of weight Fg=2N accelerates down a rough plane that isinclined at an angle %u03C6=30 degrees above the horizontal, What is the work Wgrav done on the box by gravity
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