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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.
On a spacecraft, two engines are turned on for 658 s at a moment when the velocity of the craft has x and y components of velocity v0x = 4115 m/s and v0y =5135 m/s, Find the x and ycomponents of the craft's acceleration
A box slides down a 22° ramp with an acceleration of .92m/s2. Determine out the coefficient of kinetic friction between the box and the ramp.
Two plates of area 30.0 cm2 are separated by a distance of 0.0150 cm. calculate the potential difference (voltage) between the two plates
a 250 kg merry-go-round is a solid disc with a radius of 1m when a 40 kg child sits at the center the angular speed is 6 rev/s
A spherical mirror is to be used to form a real image of an object that is located 5 meters from the object. What type of mirror needs to be used
A system does 167 J of work on its environment and gains 85.5 J of heat in the process, Find the change in the internal energy of the environment
A horizontal light ray is incident on a crown glass prism as shown in the figure below where ? = 42.5°. Find the angle of deviation ? of the ray-the angle
A rocket is accelerating upward at 4.90m/s2 from the launchpad on the earth. If the ball is displaced 8.50 ? from the vertical and released, find the amplitude of the resulting swings of this pendulum
A cell membrane is composed of lipid molecules and is approximately 18 nm thick, what is the approximate capacitance of a spherical cell that has a diameter of 20 m?
In a new (inelastic) collision, the same two bumper cars with the same initial velocities now latch together as they collide. What is the final speed of the two bumper cars after the collision
An oscillating LC circuit has a current amplitude of 7.50 mA, a potential amplitude of 250 mV, and the capacitance of 220 nF. What are (a) the period of oscillation.
A 45.0-g object connected to a spring with a force constant of 30.0 N/m oscillates with an amplitude of 4.00 cm on a frictionless, horizontal surface. calculate the total energy of the system
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