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A fire engine moving to the right at 40 m/s sound its horn (frequency = 500 Hz) at the two vehicles shown in the figure. The car is moving to the right at 30 m/s, while the van is at rest. (a) What frequency is heard by the passenger in the car? (b) What is the frequency as heard by the passengers in the van? (c) When the fire engine is 200 m from the car and 250 m from the van, the passengers in the car hear the sound intensity level of 90 dB. At that moment, what intensity level is heard by the passenger in the van?
An object is placed 130 cm in front of a converging lens of focal length 16 cm. What is the distance to the image
a 250-kg motorcycle goes around an unbanked turn of radius 13.7m at a steady 96.5 km/h. What is the magnitude of the net force on the motorcycle?
A constant force of 23 N pulls on a 12 kg block on a horizontal surface. What is the work done by the constant force
The charges are fixed to the corners of a 0.44-m square, one to a corner, in such a way that the net force on any charge is directed toward the center of the square.
A charged sphere of mass 2.5x10^-5 kg and net charge of 6.0x10^-9 C hangs from a silk thread, what is the magnitude of the charge dentist on each plate
In the All-Alaska ice Floe Softball finals, the right fielder for the Nome IceSox (who is floating on a small chunk of ice in still water) makes an outstanding catch of a line drive. what is the final heading of the fielder just after the ball is c..
What is the velocity of a beam of electrons that go undeflected when passing through perpendicular electric, What is the radius of the electron orbit if the electric field is turned off
The temperature of 15 kg of water increases at 0.003 degrees Celsius per second. At what rate is the internal energy of the water increasing
A 76 kg window cleaner uses a 13 kg ladder that is 5.0 m long. He places one end on the ground 3.0 m from a wall, What is the angle of this force on the ladder
q1. a parallel-plate capacitor is formed from two 2.0 rm cm times 2.0 rm cm electrodes spaced 5.0 rm mm apart. the
0.5 kg of saturated vapor (H2O) at 1.5 bars is contained in a piston-cylinder device. Heat transfer in the amount of 150 kJ to the steam occurs and some work is done on the steam by a impellor. At the end of this process the steam is at 1.5 bars and ..
A microphone is attached to a spring that is suspended from the ceiling, as the drawing indicates. determine the amplitude of the simple harmonic motion
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