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The decibel level of ajackhammer is 125 dB relative to the threshold of hearing. Determine the sound intensity produced by the jack hammer?
a well with vertical sides and water at the bottom resonates at 10 hz and at no lower frequency. the air in the well
A useful model of a water molecule is sketched in the figure below, with point charges of 5.2 10-20 C at the H sites, What is the total electric potential energy of this model of a water molecule
A bicycle rides by in front of you moving right to left. What is the torque applied to the wheel
25-kg ball begins rolling from rest with constant angular acceleration down a hill. how long will it take to make the next complete revolution
An 845-N sled is pulled a distance of 173 m. The task requires 1.20 x 10^4 J of work and is done by pulling on a rope with the force of 142 N. At what angle is the rope held.
A person with perfect pitch sits on a bus bench listening to the 451 Hz horn of an approaching car. If the person detects a frequency of 486 Hz, how fast is the car moving
suppose 3.0 mol of a monatomic ideal gas initially at 11 l and 340 k is heated at constant volume to 740 k allowed to
A model rocket engine has an average thrust of 5.26 N. It has an initial mass of 25.9 g, which includes fuel mass of13.4 g. What is the average exhaust speed of the engine
A 950kg car is at the top of a 40m -long, 2.5 degree incline. What the first car's speed would have been at the bottom had it not struck the second car
a tube is open at only at one end. a certain harmonic produced by the tube has a frequency of 465 hz. the next higher
A person is pushing a uniformly-loaded 24.15 kg wheelbarrow along a plank that makes an angle ? = 38.0° with the horizontal. What is the total force the person must apply
A block is dropped onto a spring with k = 33 N/m. The block has a speed of 3.4 m/s just before it strikes the spring. what is the mass of the block
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