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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 88.0 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 343 m/s.
A 5.0 kg object is moving to the right at 4 m/s and collides with another object of mass 10 kg moving to the left at 5 m/s. Find the momentum of the combined object
For the infinite square well problem an electron spends 40% of its time in the n=3 state and 60% of its time in the n=5 state. What is the average energy of the electron
Starting from its nest, an eagle flies at constant speed for 4.0min due east, then 4.2min due north. How long is the eagle in the air
A ten pound car wheel has a moment of inertia of 0.52 kg m2. How much torque is required to stop the wheel in 43.21 s
A skater is initially spinning at a rate of 13.1 rad/s with a rotational inertia of 2.54 kg·m2 when her arms are extended. What is her angular velocity after she pulls her arms in and reduces her rotational inertia to 1.64 kg·m2?
A simple pendulum with a length of 2.43 m and a mass of 6.84 kg is given an initial speed of 1.76 m/s at its equilibrium position. Determine its maximum angular displacement
A spring-loaded gun, fired vertically, shoots a marble 6.4 m straight up in the air. What is the marble's range
An electron is moving at a speed of 1.1 multiply.gif 104 m/s in a circular path of radius of 1.9 cm inside a solenoid. Find the strength of the magnetic field inside the solenoid
A helicopter is ascending vertically with the speed of 5.79. At a height of 127 above the Earth, a package is dropped from a window. How long take the package to hit the ground.
For a Nd:YAG laser there are four pump levels located at 1.00 eV, 1.24 eV, 2.40 eV, and 2.54 eV. What is shortest possible pump wavelength (in nanometers) that could be used to populate any of the excited energy levels
A steel section of the Alaskan pipeline had a length of 65 m and a temperature of 18 °C when it was installed. What is its change in length
Two 10-cm charged disks face each other, 20 cm apart. The left disk is charged to -30 nC and the right disk is charged to +30 nC. What is the electric field (both magnitude and direction) at the midpoint between the disks? What would be the force (ag..
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