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A resistor connected across an AC power supply has a current given by I = (1.15A) cos (300t) when connected to a power supply with emf 120V rms. a) Find the rms current. b) Find the resistance. c) Find the average power delivered to the resistor. Express your answers with the appropriate units.
Two children setup a "telephone" by placing a long, slender aluminium (Y = 6.9 × 1010 N/m2) bar that has a length of 6.1-m between their two houses. To communicate, the child taps a coded message on one end. How long do the sound waves take to reach ..
Refer to Interactive Solution 25.21 for help with problems like this one. How far from the wall should the mirror be located
An automobile suspension involves both leaf springs with stiffness k and shock absorbers resist motion with a force -uv. The system is critically damped. If a car has mass 2000 kg and has shock absorbers with u = 2.5 x10^4 kg/s, how much should the c..
A horizontal spring is lying on a frictionless surface. One end of the spring is attached to a wall whle the other end is connected toa movable object. The spring and object are compressed by0.074 m, released from rest, and subsequently oscillate ..
Two parallel plates have a capacitance of 1.0 µF when they are 1.0 mm apart. The plates are then fully charged by a 9.0 V battery, What is the constant electric field strength between the plates
A 160 kg horizontal beam is supported at each end. A 300 kg piano rests a quarter of the way from one end. What is the vertical force on each of the supports
A 56 kg pole vaulter running at 12 m/s vaults over the bar. Her speed when she is above the bar is 1.3 m/s. determine her altitude as she crosses the bar
In a certain experiment, the pressure of a gas depends on the volume by P=alphaV^3+betaV^2, What is the work done on the gas
light of wavelength 500 nm illuminates a 0.50 mm-diameter hole. a screen is placed 6.0 m behind the slit. the width of
Find the change in momentum of a 1380 kg car that increases its speed from 6.0 m/s to 16.0 m/s in a time of 16 s while traveling in the same direction? Express your answer to two significant figures and include the appropriate units. What minimum for..
Consider a cell that has a magnetic bead attached to it. We will treat the cell as a Kelvin body. Suppose that the magnetic field has been turned on for a very long time and is producing a constant force Fo.
In a particular region of the earth's atmosphere, the electricfield above the earth's surface has been measured to be 150 N/Cdownward at an altitude of 248 m and 168 N/C downward at analtitude of 403 m. Calculate the volume charge density of the a..
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