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You need to use your cell phone, which broadcasts an 720 MHz signal, but you're behind two massive,radio-wave-absorbing buildings that have only a 13 m space between them. What is the angular width of the electromagnetic wave after it emerges from between the buildings?
What tension is necessary to tune string properly
You want to take a full-length photo of your friend who is 1.80{\rm m} tall, using a 35.0{\rm mm} camera having a 50.0{\rm mm} lens. How far is the lens from the film
An asteroid is headed towards a starbase. To try and avoid a collision, an explosive device is planted on the asteroid, Does the other piece of the asteroid hit the starbase
A series AC circuit contains a resistor, an inductor of 210 mH, a capacitor of 5.40 µF, and a source with Î"Vmax = 240 V operating at 50.0 Hz. Calculate the resistance in the circuit
A certain dog whistle operates at 22.75 kHz, while another (brand X) operates at an unknown frequency. estimate the operating frequency of brand X
Suppose that the speed of light in a vacuum were one million times smaller than its actual value: c = 3.00 x 102 m/s. Determine how far you would have to compress the spring from its equilibrium length
Two objects each have a positive charge. The total charge on both objects is 390 µC. When the objects are placed a distance of 1.20 m apart, each exerts an electrostatic force of 21.3 N on the other. What is the charge on each object? (Round the a..
Electric charge can accumulate on an airplane in flight. You may have observed needle-shaped metal extensions on the wing tips and tail of an airplane. Their purpose is to allow charge to leak off before much of it accumulates.
If a metal wire carries a current of 23.0 mA, how long does it take for 12.0×1020 electrons to pass a given cross-sectional area anywhere along the wire? The magnitude of the charge on an electron is 1.6 × 10-19 C.
Two equally charged, 1.00 g spheres are placed with 2.00 cm between their centers. find the magnitude of the charge on each sphere
An electric field with an average magnitude of about 220 N/C points downward in the atmosphere near Earth's surface. We wish to "float" a sulfur sphere weighing 4.8 N in this field by charging the sphere. What charge (in C), with the proper sign, mus..
A football is thrown horizontally with an initial velocity of (18.9 m/s)x. Calculate the direction of the velocity with respect to the positive x-axis at this time
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