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The electromagnetic wave that delivers a cellular phone call to a car has a magnetic field with an rms value of 1.20 10-10 T. The wave passes perpendicularly through an open window, the area of which is 0.20 m2. How much energy does this wave carry through the window during a 65-s phone call?
A friend of yours is loudly singing a single note at 410 Hz when racing toward you at 26.1 m/s on a day when the speed of sound is 339 m/s. What frequency does your friend hear if you suddenly start singing at 410 Hz.
A 1000-turn loop (radius = 0.045 m) of wire is connected to a 50.0 ohm resistor, What is the current flowing through the 50.0 ohm resistor
A 30 capacitor initially charged to 20 is discharged through a 1.9 resistor. How long does it take to reduce the capacitor's charge to 5.0
If she is served 200 of coffee at 84 in a well-insulated container, how much ice at 0 should she add to obtain a final temperature of 31.
A simple pendulum on the surface of Earth is found to undergo 13.0 complete small-amplitude oscillations in 7.05 s
A spherical pot of hot coffee contains 0.75 L of liquid (essentially water) at an initial temperature of 95?C. The pot has an emissivity of 0.60, Calculate the coffee's rate of heat loss by radiation
The Earth has a surface temperature around 270 K and an emissivity of 0.8, while space has a temperature of around 2 K. If the Earth is in thermal equilibrium, how much power must the Earth absorb from the Sun
What is the velocity of a beam of electrons that go undeflected when passing through perpendicular electric and magnetic fields of magnitude 8.8x103 V/m and 3.5x10-3 T respectively
A magnetic field of 3 Tesla is oriented into the page. A 10 cm long conducting bar is pulled to the right at a constant speed of 3.4 m/s. What is the power supplied by the person pulling the bar
Football players measure their acceleration by seeing how fast they can sprint 40 yards (37 ). what is the average power output for this sprint
A block of mass 0.489 kg is placed on the end of a spring which has a stiffness of 337 N/m. What is the frequency of oscillation
Blue light of frequency 6.0 1014 Hz falls on the surface of potassium, which has a work function of 2.26 eV. Find the maximum kinetic energy of emitted electrons
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