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A person wears a hearing aid that uniformly increases the intensity level of all audible frequencies of sound by 32.5 dB. The hearing aid picks up sound having a frequency of 250 Hz at an intensity of 2.90 10-11 W/m2. What is the intensity delivered to the eardrum?
Two balls attached to strings have the same mass and volume, but are made of different materials. Which ball exerts a greater net force on the block
Two parallel wires lie in the plane of the paper with equal magnitude 5.0 A currents in the opposite direction. find the magnitude and direction of the magnetic field
Estimate the force on a 145-gram baseball if it hits the bat at 50 miles per hour and stays in contact with the bat for 0.1 second
A bead with a mass of 0.02 g and a charge of 20nC is free to slide on a vertical rod. At base of the rod is a fixed 20nC charge.
q1. to calculate the program suppose she runs up a flight of 85 steps each 0.150 m high in 69.0 s. for ease ignore an
Two positive charges, one of magntude Q and the other of magnitude 2Q, and one negative charge of magnitude -Q are placed on a straight line, Find both the magnitude and direction of the net force on the positive charge on the left
question1a 150 30.0-cm-diameter turntable rotates on frictionless bearings at 61.0. a 17.0 block sits at the center of
A person having a mass of 59.1 kg stands before a flight of 30 stairs each of which is 25 cm high. How much work did he do in overcoming gravity
The image of an object seen in a mirror is twice its actual size. The orientation of the image is the same as that of the object. what is the focal length of the mirror
A 612 kg elevator starts from rest and moves upward for 4.00 s with constant acceleration until it reaches its cruising speed, 1.84 m/s. What is the average power of the elevator motor during this period
A parallel-plate capacitor is charged to an electric potential of 285 V by moving 3.20×10^16 electrons from one plate to the other
Transverse waves travel at 150 m/s on a wire of length 80 cm that is under a tension of 550 N. What is the mass of the wire
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