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Suppose that the sound level of a conversation is initially at an angry 74 dB and then drops to a soothing 50 dB. Assuming that the frequency of the sound is 516 Hz, determine the (a) initial and (b) final sound intensities (in ?W/m2) and the (c) initial and (d) final sound wave amplitudes (in nm). Assume the speed of sound is 347 m/s and the air density is 1.21 kg/m3.
A hot air balloonist rises vertically with a constant velocity of 6.0 m/s and releases a sandbag at the precise instant when the balloon is 40.0 m above the ground. what is the time when the sandbag hits the ground
A 9.8 kg board is wedged into a corner and held by a spring at a 50.0° angle, Find the amount by which the spring is stretched from its unstrained length
An electron travels north at a speed of 6.0x10^4 m/s through a uniform magnetic field that is directed upwards and whose magnitude is 1.8x10^-3 T. determine the direction of the magnetic force
Use Kirchhoff's laws to set up three simultaneous equations that can be solved for the value of each of the currents in Figure 3 in terms of the power supply voltages and the resistor values. Use the measured resistor and power supply voltage values ..
Fighter airplane is flying horizontally at the altitude h=5000m with velocity of u=100m/s. When airplane passes directly above an air defense station, find the horizontal distance s from the fun to the point of impact
A plate carries a charge of -2.0 microcoulombs while a rod carries a charge of 2.5 microcoulombs. How many electrons should be transferred from the plate to the rod, so that both objects have the equal charge.
Air is streaming horizontally past a small airplanes wings such that the speed is 50m/s over the top surface and 30 m/s past the bottom surface. the plane has a mass of 300 kg and a total wing area of 5 m^2(both wings).
An ideal gas in a piston is placed in a refrigerator, which removes 686 J of energy from the gas via cooling. find the net change in the internal energy of the gas in the piston
Calculate the angular momentum of Jupiter due to its orbital motion about the Sun. In your calculation, use 7.780 1011 m as the average Jupiter-Sun distance and 3.740 108 s as the period of Jupiter in its orbit
An air-filled parallel plate capacitor with a plate spacing of 1.50 cm has a capacitance of 7.20 ?F. Calculate the dielectric constant of the inserted material
What is the y component (in Newtons) of F
A football punter accelerates a football from rest to a speed of 9 m/s during the time in which his toe is in contact with the ball, what average force does the punter exert on the ball
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