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A metal needle of length 7.0 cm does not have any excess charge on it. It is brought to a distance d=5.0 cm from the center of a negatively charged sphere containing N=6.4x1015 excess electrons. As a result the needle becomes polarized, with +7.3 nC on the end that is close to the sphere, and -7.3 nC on the end that is far. What is the magnitude of the total force acting on the needle?
An unstable high-energy particle is created in the laboratory, and it moves at a speed of 0.988c. What is the proper distance traveled
Charges of 3.0 nC, -2.0 nC, -7.0 nC, and 1.0 nC are contained inside a rectangular box with length 1.0 m, width 2.0 m, and height 2.5 m. obtain the electric flux through the surface of the box
Pendulum Clocks will create a ticking sound every time the pendulum reaches maximum displacement on either side. It is desired to design a grandfather clock which will tick once every side.
On a hot summer day, 4.00 x 106 J of heat transfer into a parked car takes place, increasing its temperature from 35.0o1 C to 45.0o C. What is the increase in entropy of the car due to this heat transfer alone?
Two equal conducting spheres each having a radius of 0.500 centimeter is connected by a light 1.60 meter long conducting wire. Compute what the tension in the wire
A 1200 kg ore cart is rolling at 10.8 m/s across a flat surface. A crane dumps 493 kg of ore (vertically) into the cart. How fast does the cart move after being loaded with ore? Assume that frictional forces with the flat surface may be neglected.
A refrigerator does 18.0 kJ of work while moving 115kJ of thermal energy from inside the refrigerator. what is its coefficient of performance
A block of mass 0.489 kg is placed on the end of a spring which has a stiffness of 337 N/m. What is the frequency of oscillation
An electron is brought to a point 0.1 m from the center of the sphere. What is the force acting on the electron (magnitude and direction) ? What is the electric field (magnitude and direction ) at the point where the electron is located
A 1.20 kilogram object is held 1.20 meter above a relaxed, mass less vertical spring with a force constant of 340 N/m. Evaluate how far does the object compress the spring
Each of the objects above is composed of identical thin sticks of uniformly distributed mass 6.55 kg and length 0.675 m. What is the moment of inertia of each object about a rotation axis perpendicular to the screen and passing through the black d..
A concave mirror (R = 56.0 cm) is used to project atransparent slide onto a wall. The slide is located at a distanceof 40.0 cm from the mirror, and a smallflashlight shines light through the slide and onto the mirror. Thesetup is similar to that i..
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