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(A) Find the potential energy of a system of two small spheres, one carrying a charge of 2.30 µC and the other a charge of -4.00 µC with their centers separated by a distance of 0.250 meter. Suppose zero potential energy when the charges are infinitely separated.
_______ J
(B) Assume that one of the spheres is held in place and the other sphere, which has a mass of 1.50 gram is shot away from it. Find what minimum initial speed would the moving sphere need in order to escape completely from the attraction of the fixed sphere? (To escape, the moving sphere would have to reach a velocity of zero when it was infinitely distant from the fixed sphere.)
_____ m/s
A piston, A, as shown below, has a diameter of 0.54cm. A second piston, B has a diameter of 3.7 cm. find the force, F, necessary to support the 500N weight in the absence of friction.
Sound with a frequency 650 HZ from a distant source passes through a doorway 1.10 m wide in a sound absorbing wall. Find the number and angular directions of the diffraction minima at listening positions along a line parallel to the wall.
On an air track, a 400.5g glider moving to the right at 2.00m/s collides elastically with a 500.5g glider moving in the opposite direction at 3.00m/s. find the velocity of the glider after the collision
Monochromatic light of a given wavelength is incident on a metal surface. However, no photoelectrons are emitted. how should the incident light be adjusted
In a physics lab, a student accidentally drops a 21.0-g brass washer into an open Dewar of liquid nitrogen at 77.2 K. How much liquid nitrogen boils away as the washer cools from 291 K to 77.2 K? The latent heat of vaporization for nitrogen is 199.1 ..
The speed of an ion in a particle accelerator is doubled from0.360c to 0.720c. The initial relativistic momentum of the ion is 4.40 x 10-17 kg·m/s. Decide (a) the mass and (b) the final relativistic momentum of the ion.
A helicopter holding a 70-kg package suspended from a rope 5.0 m long accelerates upward at a rate of 5.2 m/s2. Ignore air resistance on the package. Find the distance between the helicopter and the package
A person stands in a stationary canoe and throws a 5.22 kgstone with a velocity of 8.20 m/s at an angle of 34.0 degrees above the horizontal. find the horizontal recoil velocity (magnitude and direction) of the canoe
A mule uses a rope to pull a box that weighs 3.0 x 10^ 2 N across a level surface with constant velocity. What is the normal force of the floor on the box
The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. find the magnitude of the electric field within the cell membrane
a satellite has a moment of inertia of I=8000 kgm^2 and rotates at 3 rev per min. what will be the rate of rotation after the panels has been deployed
a flat surface with area 2.2 m2 is in a uniform electric field of 910 nc. what is the electric flux through the surface
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