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The sound intensity level of a racing car at a distance of 10 m is 130 dB. Assume that the racing car like a small point source and ignore the effects of absorption and reflection. (a) What is the power of the sound emitted by the car? (b) What is the sound intensity at a distance of 10 m from the car? (c) What is the sound intensity due to the car at a distance of 1.0 km from the car? (d) At what distance from the car would the sound intensity fall to the threshold of hearing
A siren produces a sound intensity level of 90 decibel at a distance of 8.0 m.
assume that the siren acts as a point source of sound.
a. What is the sound intensity at a distance of 6.0m from the siren?
b. What is the power of the sound emitted by the siren?
c. What is the sound intensity level at a distance of 16.0 m from the siren?
A ball is thrown upward with an initial velocity of 10m/s. how high does the ball rise? and what is the total time flight
A flywheel initially rotating at 600 rpm is bought to a stop by a constant torque in 15 a. How many revolutions does the flywheel make before coming to stop
Assume that a car weighing 1200kg is traveling east at a velocity of 12.0 m/s. Another car, 40 meters away, weighs 1800 kilograms and travels at a speed of 20.0 meters per second to the east. How do you determine the location of the system's center of mass when it consists of two cars? How do you calculate each car's momentum? What about the overall system's momentum?
A 10N force is applied to a 5kg object resulting in an acceleration of 0.5m/s2. What is the force of friction acting on that object?
A 2kg cart experiences three forces a 10N pull to the left, a 10N pull to the right and then some other unknown pull. If the positive direction is to the right, and the carts accelerarion is 2m/s/s what us unknown force
Two 10 kg spheres experience a 4.17 * 10-10 N force. How far apart are their centers?
Mars takes 1.88 years to complete one orbit around the sun. What is its average distance from the sun?
A convex security mirror has a focal length of -0.25 m. A person with height of 1.5 m
is 4.0 m from the mirror. GRASP method
a) Calculate the image distance.
b) Calculate the image height.
