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A 10 watt light bulb is half a meter from a book. How much power in watts does a second light have if it produces the same light intensity at 1 meters?
You place an 83.3 ohm resistor across the terminals of an unknown battery of negligible internal resistance and measure a current of 0.453 Amp flowing through it. What is the potential difference across the terminals of the battery
A lamp in a child's Halloween costume flashes based on an RC discharge of a capacitor through its resistance. The effective duration of the flash is 0.150 s, during which it produces an average 0.740 W from an average 3.00 V.
An undersea research chamber is spherical with an external diameterof 4.90 m. The mass of the chamber, when occupied, is61300 kg. What is the buoyant force on the chamber
Two small plastic spheres each have a mass of 2.0 {\rm g}and a charge of-50.0{\rm{ {\rm nC}}}. They are placed2.0 {\rm cm}apart. By what factoris the electric force on a sphere larger than its weight?
A jet airliner, moving initially at 330 mi/h to the east, suddenly enters a region where the wind is blowing at 100 mi/h toward the direction 30.0° north of east
A container has a large cylindrical lower part with a long thin cylindrical neck. The lower part of the container holds 12.5 m3 of water and the surface area of the bottom of the container is 5.48 m2. compute the magnitude of the force exerted by t..
a freezer compartment consists of a cubical cavity that is 2 m on a side. assume the bottom to be perfectly insulated.
The displacement of a harmonic oscillator is given by y = 7.1 sin(25t), where the units of y are meters and t is measured in seconds. Evaluate what is its maximum velocity
Two mirrors meet at a 133° angle. If light rays strike one mirror at 40°, at what angle ? do they leave the second mirror?what is the value of h.
A car of mass = 1300 travelling at 56.0 enters a banked turn covered with ice. The road is banked at an angle, and there is no friction between the road and car's tires. What is the radius of the turn if = 20.0 (assuming the car continues in uniform ..
two parallel plates of area 5 m2 are separated by a distance of 1.0 x 10-5m. they have charges on them of equal
In building a particle accelerator, you manage to produce a uniform electric field of magnitude 4.03 × 105 N/C in one 40.5 cm section. How much work is required to move a proton through the section
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