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A small sphere with a mass of 2.00×10−3gand carrying a charge of 4.80×10−8 C hangs from a thread near a very large, charged insulating sheet, as shown in the figure . The charge density on the sheet is−2.30×10−9 C/m^2
A. Discover the angle of the thread
65kW is to arrive at a town over two 0.100-Ω lines. Estimate how much power is saved if the voltage is stepped up from 120V to 1200V and then down again, rather than simply transmitting at 120V. Assume the transformers are 99% efficient.
A coil is wrapped with 300 turns of wire on the perimeter of a circular frame (radius = 8.0 cm). Each turn has the same area, equal to that of the frame. A uniform magnetic field is turned on perpendicular to the plane of the coil.
suppose the speci?c heats of milk and coffee are the same as that of water.
At a playground, a 19kg child plays on a slide that drops through a height of 2.3m. The child starts at rest at the top of the slide. What is the childs speed at the bottom of the slide
Put a 10 V battery with a 10 ? internal resistance in series with a switch: hook this up to a 100 ? resistor in parallel with a 2 H inductor. Find the initial voltage across the inductor when the switch is opened
A pilot flies her route in two stright-line segments. The displacement vector A for the first segment has a magnitude of 249 km at a direction of 30 degress north of east.
the resistance of a wire increases 3.9 when the temperature of the wire is raised 100degc. what is the temperature
A 8.75-\mu {\rm C} point charge is glued down on a horizontalfrictionless table. What would the tension be if both charges were negative
A flywheel is a solid disk that rotates about an axis that is perpendicular to the disk at its center. Rotating flywheels provide a means for storing energy in the form of rotational kinetic energy and are being considered as a possible alternativ..
A near-sighted person might correct his vision by wearing diverging lenses with focal length f = -45cm, Use ray tracing to determine the location of the image
An elevator with a mass of 4850 kilogram is to be designed therefore that the maximum acceleration is 0.0680 g. Find what the maximum and minimum forces the motor should exert on the supporting cable
a wire of cross-sectional area 5.0010-6 m2 has a resistance of 1.75 ohms. what is the resistance of a wire of the same
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