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In the 1930’s acoustic detection systems able to detect anaircraft at a range of 40.0 km were developed in several countries.The aircraft engines generate a sound intensity level of 95.0 dB ata distance of 10.0 metres from the aircraft, what intensity wouldbe present at the microphone in the detection system 40.0 km awayfrom the aircraft? You may assume that the aircraft is an isotropicsource of sound.
You are stranded on a deserted island. You have some wire, but no magnets. You decide to use the Earth's magnetic field, the only one available to you. What area must the coil have
A velocity selector is tuned to let charges with a speed of 325 m/s pass through. If the strength of the magnetic field is 0.250 T, what is the strength of the electric field
Water is boiling in a pan at sea level on a stove. During 10 minutes of boiling, it is observed that 200 grams of water has evaporated. Then the rate of heat transfer to the water is what is kJ/min?
A new type of personal scale is designed where the person stands on top of a platform supported by a rubber cylinder which has a radius of 5 cm and a height of 10 cm. What is the mass of the person
Unpolarized light passes through two polarized sheets. Theaxis of the first is vertical and that of the second is at16degrees to the vertical. What is the fraction of the initiallight that is tranmitted
When a 65-kg person climbs into a 1000-kg car, the car'ssprings compress vertically by 2.8 cm. What will be the frequency of vibration when the car hits a bump
A solid, uniform ball of mass 14.3 kg , and radius 0.21m , rolls without slipping up a hill of height 29.4m , How long is the ball in the air
On a banked race track, the smallest circular path on which cars can move has a radius of 106 m, compute the largest speed at which cars can move on this track without relying on friction
The spin cycles of a washing machine have two angular speeds, 437 rev/min and 641 rev/min. The internal diameter of the drum is 0.620 m. Find the laundry's maximum tangential speed
A thin layer of magnesium fluoride (n = 1.38) is used to coat a flint-glass lens (n = 1.61). (a) What thickness should the magnesium fluoride film have if the reflection of 717-nm light is to be suppressed? Assume that the light is incident at right ..
A uniform magnetic field of magnitude 1.00 T is directed perpendicular to the plane of a rectangular loop having dimensions 8.1 cm by 10 cm
Find the coefficient of kinetic friction between a 4.1- block and the horizontal surface on which it rests if an 83 spring must be stretched by 3.0 to pull the block wi`th constant speed. Assume the spring pulls in a direction 15 above the horizontal..
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