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In some places, insect "zappers," with their blue lights, are afamiliar sight on a summer's night. These devices use a highvoltage to electrocute insects. One such device uses an ac voltageof 3970 V, which is obtained from a standard 120-V outlet by meansof a transformer. If the primary coil has 30 turns, how many turnsare in the secondary coil?
A conducting rectangular solid of dimensions dx = 5 m, dy = 3m, and dz = 2m moves at a constant velocity V= 20 i m/s through a uniform magnetic field B = 30 mT j.
A 1940-kg car experiences a combined force of air resistance and friction that has the same magnitude whether the car goes up or down a hill at 32.2 m/s. At what angle is the hill inclined above the horizontal
When monochromatic light shines perpendicularly on a soap film (n = 1.33) with air on each side, What is the vacuum wavelength of the light
A 230g baseball is pitched at 32m/s , and it's spinning at 44 rad/s. What fraction of its kinetic energy is rotational
A rocket has a mass of 1.2kg and is acted upon by an impulse from the engine of 130.5 N s during the 2 seconds the engine is firing. Determine the average net force acting on the rocket while the engine fired?
Compressed air is used to fire a 52 g ball vertically upward from a 1.7-m-tall tube. How high does the ball go above the top of the tube
A vertical spring, k= 305N/m, vibrates with amplitude of 28cm when.26kg hangs from it. What equation describes the motion as a function of time
A purple beam is hinged to a wall to hold up a blue sign. The beam has a mass of mb = 6.1 kg and the sign has a mass of ms = 16.8 kg. What is the net force the hinge exerts on the beam
Calculate the net impulse delivered to a 138-kg quarterback initally running at 4.5 m/s if he's hit by a defending player and slowed to a speed of 1.1 m/s
A rock is released from rest into water. The magnitude of Fd of the drag force acting on the rock due to its motion through water can be modeled as Fd = Cd(v), where v is the speed of the rock and Cd is the constant drag coefficient. Determine the..
a 10.5-kg uniform board is wedged into a corner and held by a string at a 50 degree angle. calculate the tension in the
A massless spring hangs from the ceiling with a small object attached to its lower end. What is the frequency of the oscillation
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