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A sound wave from a police siren has an intensity of 103.1 W/m2 at a certain point; a second sound wave from a nearby ambulance has an intensity level that is 12 dB greater than the police siren's sound wave at the same point. What is the intensity level of the sound wave due to the ambulance?
dB
At t = 0, a stone is dropped from a cliff above a lake; 2.2 seconds later another stone is thrown downward from the same point with an initial speed of 48.0 m/s. Find the height of the cliff
A particle with a charge of ?1.0 ?C and a mass of 2.4 10-6 kg is released from rest at point A and accelerates toward point B, What is the potential difference VB ? VA between A and B
A bullet with a mass of 4.25g , traveling horizontally with a speed of 434m/s , is fired into a wooden block with mass of 0.786kg, What is the decrease in kinetic energy of the bullet
Vector A~ has a magnitude of 9 and points in the positive x-direction. Vector B~ has a magnitude of 19 and makes an angle of 38? with the positive x-axis
Using and Atwood machine with masses m1 and m2, at first with m1 a distance 2h above m2, what is the speed of either mass they pass each other? Make use of energy to solve (hint they cross halfway between the starting positions of the two masses).
Disscus how the conservation of energy law explain whys the temperature of a gas increases when it is quickly compressed, whereas the temperature decreases when the gas expands.
An electron is projected vertically upward with a speed of 1.65x10^6 m/s into a uniform magnetic field of 0.160 T that is directed horizontally away from the observer. What would the radius of the circle be.
A free electron and a free proton are placed in an identical electric field. which of the following statement are true?
A river flows due east at 1.50 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 15 m/s due north relative to water.
A block of mass 2.50 kg is pushed 2.60 m along a frictionless horizontal table by a constant 14.0 N force directed 25.0ª below the horizontal. Determine the work done by the normal force exerted by the table
If the asteroid fragment contains carbon, it may burn when entering Earth's atmosphere. Which type of chemical bond would result from this process
White light shines through a diffraction grating and onto a screen, What is the number of lines per (mm) for this grating and What is the number of lines per (cm)
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