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The height of a typical AM radio station's tower is one-fourth of the radio wavelength. How high should the tower be for a radio station broadcasting at 830kHz ? Express your answer to two signific
An RLC series circuit is in resonance at 75Hz . If you halve both the inductance and capacitance, what's the new resonance frequency? Express your answer to two significant figures and include the
The series combination is connected across a 200V (rms), 68Hz power supply. a) Find the phase angle. b) Find the impedance of the RC combination. c) Find the peak current. Express your answers to tw
A resistor connected across an AC power supply has a current given by I = (1.15A) cos (300t) when connected to a power supply with emf 120V rms. a) Find the rms current. b) Find the resistance. c) F
You have a variable capacitor ranging from 5.9 pF to 9.9 pF . What inductor should be used with this capacitor in an FM radio receiver covering the entire FM band, 85MHz to 110MHz? Express your answ
A 220-turn coil carries 320mA . If the magnetic flux through the coil due to this current is 0.80Wb, what's the coil's inductance? Express your answer to two significant figures and include the app
Find the peak emf in this coil when it's rotating at 110Hz in a strong 6.6T field. Express your answer to one significant figure and include the appropriate units.
A magnetic field increases from 0 to 0.12 T in 1.8 s. How many turns of wire are needed in a circular coil 14 cm in diameter to produce an induced emf of 5.4 V?
A 3.3T magnetic field makes a 45 degree angle with a square loop 32cm on a side. What's the magnetic flux through the loop? Express your answer to two significant figures and include the appropriat
Assume an elastic collision with the ground instantaneously reverses the velocity of the basketball while the tennis ball is still moving down because the balls have separated a bit while falling. T
E = Blv, at B = magnetic flux density, T l = length of the conductor cutting the field, m v = speed at which the conductor cuts the field, m/s Faraday's Law, Newton's Law is used to calculate the ve
The interior of the house is maintained at Ti=75ºF by an air condition unit working continuously. 1) Calculate the rate of heat exhausted by the air condition unit.
A coil of wire is connected to an ideal 9.0-V battery at t = 0. At t = 15.8 ms, the current in the coil is 204 mA. One minute later, the current is 270 mA. a.) Find the resistance of the coil. b.) C
What is the angular separation between two stars that are barely resolved by the average eye, when viewed through a good-quality astronomical telescope with an angular magnification of 73.3? (The m
The objective mirror of the Mt. Palomar telescope has a 200-inch diameter. If an ocular with a diameter of 0.90 inches is used, what is the ratio of the intensity of light emerging from the ocular t
The electric field from a radio station some distance from the transmitter is given by (10^-4N/C) cos 10^6t, wheretis in seconds. (a) What peak voltage is picked up on a 32 cm wire oriented parallel
A single conducting loop of wire has an area of 7.1×10?2 m^2 and a resistance of 120 ohms. Perpendicular to the plane of the loop is a magnetic field of strength 0.55T. At what rate (in T/s) m
The ionosphere is at a level of about 70 km, and the potential difference between earth and ionosphere is about 350,000 V. Calculate:
A molecule of DNA (deoxyribonucleic acid) is 2.16 µm long. The ends of the molecule become singly ionized: negative on one end, positive on the other. The helical molecule acts like a spring a
John is listening to a horn. He knows the frequency of the horn is 516.402 Hz when both he and the horn are at rest. If John hears the horn's pitch at 549.402 Hz, which of the following are possible
What are the pressure and velocity of the water in the tip? What is the speed of the water just outside of the tip of the fire house? I did this incorrectly, I think maybe I started right because he
What is the magnitude and direction of the velocity of the blocks after the collision? To the left or to the right?
A pulley having a rotational inertia of 1.0x10^4 g/cm^2 and a radius of 10 cm is acted upon by a force applied tangentially at its rim that varies in time as F=0.50t + 0.3t^2, where F is in Newton's