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Male Rana catesbeiana bullfrogs are known for their loud mating call. The call is emitted not by the frog's mouth but by its eardrums, which lie on the surface of the head. And, surprisingly, the sound has nothing to do with the frog's inflated throat. If the emitted sound has a frequency of 275 Hz and a sound level of 87.0 dB (near the eardrum), what is the amplitude of the eardrum's oscillation (in ?m)? The air density is 1.21 kg/m3 and the speed of sound is 346 m/s.
Light of wavelength 653.0 nm is incident on a narrow slit. The diffraction pattern is viewed on a screen 83.5 cm from the slit. obtain the width of the slit
A certain lightbulb has a tungsten filament having a resistance of 16 ? at 22°C and 155 ? when hot. Find the temperature of the filament when it is hot
At rest when constructed, the ring is set rotating about its axis so that the people inside experience effective free-fall acceleration equal to g. The rotation is achieved by firing two small rockets attached tangentially to opposite points on the r..
A square plate of copper with 55.0 cm sides has no net charge and is placed in a region of uniform electric field of 83.0 kN/C directed perpendicularly to the plate. Find the charge density of each face of the plate
An electronic device dissipating 30 W has a mass of 20g and a specific heat of 850 J/kgoC. The device is lightly used, and it is on for 5 min and then off for several hours, throughout which it cools to the ambient temperature of 25 o C.
For electrons in a metal, why is the density of states at the Fermi energy approximately equal to the density of free electrons divided by the Fermi energy
Two objects (39.0 and 23.0 kg) are connected by a massless string that passes over a massless, frictionless pulley, find the acceleration of the objects
A cannonball shot with the initial velocity of 129 m/s at an angle of 36° follows a parabolic path and hits a balloon at the top of its trajectory. Neglect air resistance, how fast is the cannonball going as it hits the balloon.
Calculate the de Broglie wavelength for an alpha particle (He-e nucleus) with energy E = 4.2 GeV (which is emitted in the radioactive decay of U-238)
A satellite of mass 200 kg is orbiting around the Earth with constant speed, in a circular orbit. The centripetal acceleration is am = 0:6 m/s2 . We need to make a correction to its orbit so we fire its boosts. The first boost creates an instant fo..
You are pushing a 142 kg wooden crate in a straight line a distance of 5.1 m across a wooden floor. The crate is speeding up at 0.30 m/s^2. What is the work done by friction on the crate
q1. a 485 kg sailboat has an acceleration of 0.50 ms2 at an angle of 51deg north of east. find magnitude and direction
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