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Suppose that the sound level of a conversation is initially at an angry 72 dB and then drops to a soothing 50 dB. Assuming that the frequency of the sound is 507 Hz, determine the
(a) initial and
(b) final sound intensities (in μW/m2) and the
(c) initial and
(d) final sound wave amplitudes (in nm). Assume the speed of sound is 345 m/s and the air density is 1.21 kg/m3.
At an amusement park there is a ride in which cylindrically shaped chambers spin around a central axis, What is the radius of a chamber
Setting a world record in a 100m race, Maggie and Judy cross the finish line in a dead heat, both taking 10.0 s. Accelerating uniformly, Maggie took 2.0 s and Judy 2.5 s to attain maximum speed that they maintained for the rest of race.
A player uses a hockey stick to increase the speed of a 0.200 kg hockey puck by 6m/s in 2 seconds. how much force was exerted on puck? how much on the stick.
An automobile has a total mass of 1700 kg. It accelerates from rest to 40 km/h in 10 s. Assume each wheel is a uniform 32 kg disk. find the total kinetic energy of the automobile
Two wheels have the same mass and radius of 4.8 kg and 0.50 m, respectively. Find the net external torque that acts on each wheel
A vacuum cleaner is plugged into a 120.0-V socket and uses 2.4 A of current in normal operation, Find the coil resistance of the motor
A horizontal beam of electrons initially moving at 4.0x10^7 m/s is deflected vertically by the vertical electric feild between oppositely charged parallel plates. the magnitude of the field is 2x10^4N/C. What is the verticle deflection d of the el..
Two waves traveling in the same direction combine. The constituent waves have identical angular wave numbers, find the phase difference between the constituent waves
Two identical balls are traveling toward each other with velocities of -4.1 m/s (ball A) and +9.5 m/s (ball B), Obtain the velocities (magnitude and direction) of balls
A ball on a porch rolls 60cm to the porch's edge, drops 40cm, continues rolling on the grass, and eventually stops 80cm from the porch's edge. What is the magnitude of ball's total displacement, in centimeters.
A 7.11-kg box is sliding across the horizontal floor of an elevator. find the kinetic frictional force that acts on the box
In a home laundry dryer, a cylindrical tub containing wet clothes is rotated steadily about a horizontal axis as shown in the figure below. what rate of revolution is needed
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