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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.
Someone points out that a ball, if released from rest on a hill, will roll down the hill with increasing momentum. explain the Law of Conservation of Linear Momentum
A battery provides a voltage of 10.0V and has unknown internal resistance Rint. If the external resistance is then changed to R2 = 7.00? , what is the value of the current I2 in the circuit
A person stands on a scale in an elevator. As the elevator starts, the scale has a constant reading of 590 N. Determine the magnitude of acceleration of the elevator
To verify her suspicion that a rock specimen is hollow, a geologist weighs the specimen in air and in water. What fraction of the specimen's apparent volume is solid
Find the linear momentum and kinetic energy of a bullet of mass 4.60 10-2 kg moving at a speed of 320 m/s
The ground state total energy, total entropy, and temperature are 5.00 Btu, 0.11690 Btu/R, and 50.0°F, respectively. If the total entropy of the cell must be ten times its ground state value,
A thin film of acetone (n = 1.25) coats a thick glass plate (n = 1.50). White light is incident normal to the film. In the reflections, fully destructive interference occurs at 600 nm and fully constructive interference is seen at 700 nm. No other de..
Two astronauts are at rest in outer space, one 19.7 m from the Space Shuttle and the other 39.4 m from the Shuttle. Using a 129.0-W laser, how long will it take her to reach the Space Shuttle
When an electric heater is turned on, the Nichrome heating element is at 0° C and draws a current of 15 A, with a potential difference of 120 V between the ends of the element. The element heats up to 797° C, with the potential difference constant..
The heat of fusion for water is 80. cal/g. How various calories of heat are released when 20.0 g of water at 30. °C is cooled to 0 °C and frozen to ice at 0 °C
a concave mirror has a focal length of 15.0 cm. An object is placed 18.5 cm in front of the mirror. How tall is the object placed in front of the mirror
A uniform plank of length 4.30 m and weight 226 N rests horizontally on two supports, with 1.10 m of the plank hanging over the right support (see the drawing). To what distance x can a person who weighs 437 N walk on overhanging part of the plank be..
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