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The surface area of the eardrum is about 8 x 10^-5 m^2. What is the power transmitted to the eardrum by a soundwave of 40 dB if no sound is reflected?
Diffraction grating produces its third-order bright band at an angle of 79.4 degrees for light of wavelength 731nm. Find the angular location of the first-order bright band
A microscope with an eyepiece lens of focal length 1.90 cm and an objective lens of focal length 1.15 cm is used to examine a section of the brain of a sacrificed rat. The distance between the lenses of the instrument is 24.0 cm and final image is vi..
a 1.2-m-long steel rod with a diameter of 0.50 cm hangs vertically from the ceiling. By how much does the rod stretch
The pressure in a section of horizontal pipe with a diameter of 2.0 cm is 146 kPa. Water flows through the pipe at 2.80 L/s. what should the diameter of the constricted section be
Find the change in length of the bridge for an increase in temperature of 10 degree Celcius
An engine is built to extract power from the temperature difference in the ocean. what is the maximum theoretical efficiency of such an engine
A cube of ice is taken from the freezer at -8.4^circ C and positioned in a 114 g aluminium calorimeter filled with 322g of water at room temperature of 20.0 C. The final situation is observed to be all water at 15.0C.
A 2.40g bullet embeds itself in a 1.50kg block, which is attached to a spring of force constant 770 N/m. Find the time for the bullet-block system to come to rest
An ambulance moving at 37 m/s sounds its siren whose frequency is 500 Hz. What frequency does a person in the car hear as the ambulance approaches the car
A 9.0W laser beam shines on an ensemble of 1024 electrons, each in the ground state of a one-dimensional infinite square well 0.82nm wide. How many electrons can be so excited if the beam shines for 5.0ms
A 1590 kg roller coaster car starts from rest at a height H = 20.0 m above the bottom of a 15.0 m diameter loop. determine the downward force of the rails on the car
In the 1950s, an experimental train that had a mass of 2.30 x 10^4 kg was powered across a level track by a jet engine that produced the thrust of 5.30 x 10^5 N for a distance of 504 m. unless otherwise directed, suppose that air resistance is neglig..
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