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A certain sound has an intensity of 4.986275×10-4 W/m2 2.33 m from its source. What is the power emitted by this source in watts? Express your result to three significant digits and in scientific notation. Hint: The area of a sphere is 4π
A 0.75 kg object is suspended by a string from the ceiling of a car while the car travels in a 30 m radius circle at 25m/s. What angle does the string make with the vertical?
When lightning strikes a vehicle with a person inside, how long should the person stay inside the vehicle
A radioactive isotope has a decay constant lambda = 0.0582 s-1. What is the half-life of the isotope in seconds? What fraction of the activity of a sample of the isotope will remain after 30 seconds?
question1the diameter of the large piston of a hydraulic press is 20 cm. and the area of the small piston is 0.50 cm2.
A proton is released from rest at the left side of a region by a uniform electric field that is directed to the right. At the same time, an electron is released from rest on the right side of this same region. Ignoring the electrical and gravitationa..
A 6.50%u03BCF capacitor that is initially uncharged is connected in series with a 4700%u03A9 resistor, Just after the circuit is completed, what is the voltage drop across the capacitor
A horizontal pipe 12.00 centimeter in diameter has a smooth reduction to a pipe 6.00 centimeter in diameter. Find at what rate does water flow through the pipes
Why in this case The magnetic field in the inductor is maximum at t = 0 s.
Planet A and Planet B are in circular orbits around a distant star. Planet A is 4.5 times farther from the star than Planet B. What is the ratio of their speeds
question uncompressed the spring for an automobile suspension is 40cm long. it needs to be fitted into a space 33cm
a cowboy fires a silver bullet of mass 5g with a muzzle speed of 257 ms into the pine wall of a saloon.what is the
An isolated parallel plate capacitor contains charge Q = +10uC on its plates, correponding to a potential difference of 10V. What is the voltage between the two plates after the separation becomes 2d
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