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Q1. Antennas for radio transmission and reception are particularly effective if they're about a half-wavelength long. What's the appropriate length for an FM antenna, taking 90MHz as a typical FM frequency? (You may have used such an antenna with your FM receiver.) Express your answer to two significant figures and include the appropriate units.
Q2. Light travels at about 0.75c in water. What's the wavelength in water of light whose wavelength in vacuum is 642nm ? Express your answer to two significant figures and include the appropriate units.
the velocity vector of a sprinting cheetah has x and y components vx= +12.6 m/s and vy=-27. m/s. what is the magnitude of the velocity vector
A 600-eV electron and a 300-eV electron trapped in a uniform magnetic field move in circular paths in a plane perpendicular to the magnetic field. What is the ratio of the radii of their orbits
question1the suspended 2.2 kg mass on the right is moving up the 1.8 kg mass slides down ramp and the suspended 8.7 kg
A racecar with a speed of 60 m/s is taking a curve with a radius of 10 m. What is the acceleration of the racecar? What is the centripetal force acting on the car (mass = 400 kg)?
A step-down transformer (turns ratio = 1:8) is used with an electric train to reduce the voltage from the wall receptacle to a value needed to operate the train. What is the current in the primary coil
(Rev 2/11)In a 60 Hz circuit (such as house wiring), the voltage varies from a maximum value to a minimum, and back again 60 times per second. How is the average voltage defined
A 7650kg iceberg with density 931 kg/m3 is afloat in seawater with density 1030 kg/m3. find the buoyant force on the iceberg
A bullet with mass m = 5.21 g is moving horizontally with a speed v = 373 m/s when it strikes a block of hardened steel with mass M = 14.8 kg, What was the change in kinetic energy (J) of the bullet
A pilot having mass M(kg) flies a plane in a vertical loop with a radius of 800m at a constant speed of 500 km/h. Determine the force exerted on the pilot by the seat at both the top and bottom of the loop
Modeling the optical trap as a Hookean spring, evaluate the trap stiffness using the Boltzmann distribution. Determine the sphere diameter by comparing the Stokes drag and the tweezer force that balances the drag.
You are on the Turkish Twist, an amusement park ride with your back against the wall of a spinning vertical cylinder of radius 4.0 m, What is the minimum number of revolutions per minute necessary to prevent you from sliding down the wall
You have been given 4.4584807 g of copper from which you are to fashion a wire whose resistance is 1.2941073 ohms. What will the diameter of the wire be that you fashion
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