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A convex lens is held over a piece of paper outdoors on a sunny day. When the paper is held 30 {\rm cm} below the lens, the sunlight is focused on thepaper and the paper ignitesWhat is the focal length of the lens?
The magnetic field B at the center of a circular coil of wire carrying a current I (as in fig. 20-9) is where N is the number of loops in the coild, determine the magnetic field strength at the center of the coil
A human hair is placed directly in front of the opening of a laser pointer. The light has a wavelength of 647.8 nm. Determine the approximate thickness of the hair
A 0.43-kg metal sphere oscillates at the end of a vertical spring. As the spring stretches from 0.12 m to 0.23 m, What is the spring constant of the spring
The electric potential difference between two infinite, parallelmetal plates is V. If the plates are separated by adistance L = 4.7 mm and the electric field between the plates is E = 265 V/m, what is V?
Two charges of equal magnitude exert an attractive force of 7.5×10-4 N on each other. If the magnitude of each charge is +2.4? C, how far apart are the charges
A 3m long ladder leans against a frictionless wall. The coefficent of static friction between teh ladder and the floor is .40. What is the minimum angle the ladder can make
A girl of m1=60 kg springs from a trampoline with an initial upward velocity of Vi=8.0 m/s. what is the speed of the girl immediately before she grabs the box
A 2.0 object is attached to a spring (k=55.6 N/m) that hangs vertically from the ceiling. find the magnitude of the maximum acceleration of the object
A 5.80uFparallel-plate air capacitor has a plate separation of 4.00mmand is charged to a potential difference of 400V. Calculate the energy density in the region between the plates
A certain lightbulb is rated at 75.0 W when operating at an rms voltage of 120 V. What is the resistance of the bulb
In the macroscopic world, you know that you can hear but cannot see around corners. Explain why sound diffracts easily around a classroom door
An asteroid has acquired a net negative charge of 128C from being bombarded by the solar wind over the years, How many more electrons does it have than protons
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