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Two automobiles are equipped with the same single-frequency horn.When one is at rest and the other is moving toward an observer at15.6 m/s, a beat frequency of 5.52 Hz is heard. What is thefrequency the horns emit? Assume T = 20°C .
A motor (mass of 180kg) sits on a horizontal 2.25 m masslessplank. The motor is 1.00 m from one end of the plank. Find the supporting force applied at each end of the plank to keep thesystem in equilibrium
a 50 w light bulb shines through two polarizers. after having passed through the first polarizer the electric field
A jet engine emits sound uniformly in all directions, radiating an acoustic power of 2.17 × 102 kW. Find the intensity of the sound
An 800-N billboard worker stands on a 4.0-m scaffold supported byvertical ropes at each end. what is the tension in the ropenearest the worker
A bottle of saline solution (with a specific gravity of 1.02) is attached to a 1.2 m long piece of tubing with a 1.0 cm inner diameter. If the tubing is held vertically, filled with saline, and clamped at the bottom, (a) what is the gauge pressure at..
A model airplane of mass 0.870 kg is flying at constant speed in a horizontal circle at one end of a 28.0 m cord and at a height of 17.0 m. What is the acceleration of the plane
A roller coaster, loaded with passengers, has a mass of 2,000 kg; the radius of curvature of the track at the TOP point before the dip is 24 m. what force is exerted on the vehicle by the track
A spacecraft flies towards the Earth at a speed of 0.8c and shines a laser at an observer on Earth. At what speed would the laser light be moving
A solid piece of an unknown material wights 96.9 N in air and 59.6 N when submerged in water. The density of water is 1000 kg/m3, Determine the density of the material
The work done by an external force to move a -8.90charge from point a to point b is 1.80×10?3 . If the charge was started from rest and had 4.87×10^4 of kinetic energy when it reached point b, what must be the potential difference between a and b?
The 100 block in 4.7 to reach the floor after being released from rest. What is the mass of the block on the left.
A singly charged positive ion has a mass of 2.53 10-26 kg. After being accelerated through a potential difference of 238 V, Calculate the radius of the path of the ion in the field
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