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On a workday the average decibel level of a busy street is 84 dB, with 100 cars passing a given point every minute. If the number of cars is reduced to 30 every minute on a weekend, what is the decibel level of the street?
You can ignore friction between the sled and surface of the pond. Use the work-energy theorem to find the speed of the sled at 3.00 m.
When a 0.20-kg block is suspended from a vertically hanging spring, it stretches the spring from its unstrained 0.005 m. find the total mechanical energy of the system at any instant
When it rains, water vapor in the air condenses into liquid water, and energy is released. (a) How much energy is released when 0.0285 m (1.12 inch) of rain falls over an area of 2.59×106 m2 (one square mile)? (b) If the average energy needed to h..
35 kg girl is bouncing on a trampoline. Throughout a certain interval after leaving the surface of the trampoline, her kinetic energy decreases to 170 J from 470 J. How high does she rise during this interval? Avoid air resistance.
a box sits on a horizontal wooden board. the coefficient of static friction between the box and the board is 0.25. you grab one end of the board and lift it up, keeping the other end of the board on the ground. what is the angle between the board ..
An electron and a proton are each placed at rest in a uniform electric field of magnitude 564 N/C. Calculate the speed of each particle 44.4 ns after being released.
An intergalactic rock star bangs his drum every 1.52 s. A person on earth measures that time between beats is 2.10 s. How fast is the rock star moving relative to the earth.
The cord is after that pulled from below, shortening the radius of the circle in which block revolves to 0.15. Model the block as a particle.
An electron with kinetic energy 1.52 keV circles in a plane perpendicular to a uniform magnetic field. The orbit radius is 22.0 cm, Find the frequency of circling
What additional experiment can help you decide between these two possibilities.
What are the magnitude and direction of the resultant vector R , when the parallelogram law is applied to A and B?
A woman rides a carnival Ferris wheel at radius 16.0 m, completing 4.40 turns about its horizontal axis every minute. What are (a) period of the motion, and the magnitude of her centripetal acceleration at (b) highest point and (c) lowest point.
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