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Hot chocolate effect. Tap a metal spoon inside a mug of water and note the frequency fi you hear. Then add a spoonful of powder (say, chocolate mix or instant coffee) and tap again as you stir the powder. The frequency you hear has a lower value fs because the tiny air bubbles released by the powder change the water's bulk modulus. As the bubbles reach the water surface and disappear, the frequency gradually shifts back to its initial value. During the effect, the bubbles don't appreciably change the water's density or volume or the sound's wavelength. Rather, they change the value of dV/dp—that is, the differential change in volume due to the differential change in the pressure caused by the sound wave in the water. If fs/fi = 0.342, what is the ratio (dV/dp)s/(dV/dp)i?
At the beginning of a dive, a diver is in the layout position with an angular velocity of 100°/s and a moment of inertia of 15 kg·m2. What is the diver's moment of inertia in the tuck position
A high performance solar panel is 24" by 54". Its maximum power output is 100W when placed under full sunlight. What is the efficiency of this panel
How did Pavlov and Watson's focus on scientific inquiry of behaviours differ from earlier viewpoints of structuralisms, psychoanalysts, and functionalists.
A 2-kg block is initially at rest on a horizontal frictionless surface at x = O. What is the maximum kinetic energy of the block between x = 0 and x = 2 m
A 500-eV electron and a 300-eV electron trapped in a uniform magnetic field move in circular paths in a place perpendicular to the manetic field
Electrons emitted by the photoelectric effect are accelerated and then strike a phosphorescent screen, causing it to glow more brightly than the original scene.
A small object is 10 cm to the left of a converging lens (f = +5 cm), Find the position and magnification of the final image by calculation
An ac generator supplies a peak (not rms) voltage of 120.0 V at 60.0 Hz. It is connected in series with a 50.0-Ω resistor, What is the rms voltage of the generator
An object is placed 100 cm in front of a diverging lens of focal length -25 cm. What is the lateral magnification of this system of lenses
light bulb has a resistance of 260 . It is connected to a standard wall socket (120 V rms, 60.0 Hz). Determine the rms current in the bulb
Students determine the frequencies of standing waves on the horizontal segment of the string, then they raise a beaker of water until the hanging 1.4 kg {\rm kg} sphere is completely submerged.
A block (mass = 1.8 kg) is hanging from a massless cord that is wrapped around a pulley (moment of inertia = 1.2 x 10-3 kg·m2), find the angular acceleration of the pulley
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