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The sound level from a siren emitting sound with a frequency of 2300 Hz is 70.0 dB at a distance of 40.0 m from the siren. Assume that the intensity of that sound obeys the inverse square law. Calculate how far from the siren a person, with a threshold of hearing of 25.0 dB at that frequency, can be located to barely be able to hear the sound from that siren.
A Cessna aircraft has a lift-off speed of 120 km/h. What minimum constant acceleration does the aircraft require if the aircraft is to be airborne after a takeoff run of 260 m? How long does it take the aircraft to become airborne?
A grating is made of five similar, uniformly spaced, narrow slits. For light of wavelength ? = 675 nm perpendicularly incident on the slits, What is the angular position of the first principal order when the first and fifth slits are covered
An electron collides elastically with a stationary hydrogen atom. The mass of the hydrogen atom is 1837 times that of the electron. Assume that all motion, before and after the collision, occursalong the same straight line.
Michelle is enjoying a picnic across the valley from a cliff. She is playing music on her radio (assume it to be an isotropic source) and notices an echo from the cliff. what is the intensity of the music arriving at the cliff
NASA's Cassini mission to Saturn released a probe on December 25, 2004, that landed on the Saturnian moon Titan on January 14, How many revolutions had Huygens completed when it was 130 yards from the mother ship
A Dodge Caravan has a speed of 50 mph and an acceleration of 2 mph second. Which car has the higher speed after 10 seconds have elapsed
A wall clock has a second hand 20.0 long. What is the radial acceleration of the tip of this hand?
A ping pong ball of mass 100 grams travelling at 10 m/s hits a stationary bowling ball of mass 3 kg, head on. determine the final velocities of both balls
A thin rod consists of two parts joined together. One third of it is silver and two-thirds is gold. The temperature decreases by 24C°.
A bicyclist travels in a circle of radius 26.0 m at a constant speed of 9.00 m/s. The bicycle-rider mass is 84.0 kg. Calculate the magnitude of the net force on the bicycle from the road
A projectile is launched on an unnamed planet. The projectiles vertical position is y(t)= -5t^2 + 15t +50, find the vertical velocity of the projectile launched
A non-conducting, infinitely long cylinder of radius R lies along the z-axis. Find what is the magnetic field on the z-axis
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