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The peak power of a 6ft. diameter antenna is 10 watts and its duty cycle is 0.250. The wave length is 0.03m/cycle. Find the power density in mw/cm2 at 50 meters from the antenna.
When point charges q1=+8.4uC and q2 = +5.6uC are brought near each other , each experience a repulsive force of magnitude 0.66 N. Determine the distance between the charges.
Decreasing the resistance of an ammeter's shunt resistance a.) allows it to measure a larger current at full scale deflection. b.) converts it to a voltmeter. c.) allows it to measure a smaller current at full scale deflection. d.) enables more curre..
Two identical balls are traveling toward each other with velocities of -4.1 m/s (ball A) and +9.5 m/s (ball B), Obtain the velocities (magnitude and direction) of balls
A hanging magnesium wire with diameter0.13 cm is initially 2.0 m long. When a 28kg mass is hung from it, the wire stretches an amount 1.03 cm. A mole of magnesium has a mass of 24 grams, and its density is 1.74 g/cm3.
a neutron in a reactor makes and elastic head-on collision with a carbon atom at rest. the mass of the carbon atom is
Light from a laser beam with a wavelength of 600 nm passes through a narrow single slit and observed on a screen 1.5 m behind the slit. The first minimum of the diffraction pattern is 1.5 cm from the central maximum. How wide is the slit?
A wheel is spinning at 53 rad/s. It undergoes an angular acceleration of 44 rad/s 2 until it reaches an angular velocity of 381 rad/s. Decide how long it took to spin up. Decide how many revolutions it made while spinning up.
assume the coefficient of kinetic friction between m_{rm A} and the plane in the figure is mu_k = 0.15, and that m_{rm{A}} = m_{rm{B}} = 2.7{rm{ kg}}. What smallest value of mu _{rm{k}} will keep the system from accelerating.
An 8-m-long beam, weighing 14,700 N, is hinged to a wall and supported by a light rope that is attached 2.0 m from the free end of the beam. calculate the reaction force of the wall on the beam
a force of 63.1 n is required to start a 7.0-kg box moving across a horizontal concrete floor. what is the coefficient
A softball of mass 0.220 kg that is moving with a speed of 5.5 m/s (in the positive direction) collides head-on and elastically with another ball initially at rest. calcultae the velocity of the target ball after the collision
You are researching personal watercraft (PWC) safety. These vehicles have a well known safety issue in which the rider loses steering control when there is no thrust from the engine. What is the distance covered in that time
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