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A typical sound level for a buzzing mosquito is 40 dB, and that of a vacuum cleaner is approximately 70 dB. Obtain how many buzzing mosquitoes will produce a sound intensity equal to that of a vacuum cleaner?
consider an object with s12cm that produces an image with s115cm. note that whenever you are working with a physical
A 40.0 kg wagon is towed upa hill inclined at 17.5° with respectto the horizontal. The tow rope is parallel to the incline and hasa tension of 140 N. How fast is the wagon going after moving 76 m up the hill
Planet Z is 12,000 km in diameter. The acceleration due to gravity on Planet Z is 7.0 m/s2.
A copper (Young's modulus 1.1 x 1011 N/m2) cylinder and a brass (Young's modulus 9.0 x 1010 N/m2) cylinder are stacked end to end, Find the amount by which the length of the stack decreases
a lawnmower has a six horsepower engine 1hp750w. the engine had an efficiency of 20. the throttle is set so that the
What is the bubble's diameter just as it reaches the surface of the lake, where the water temperature is 20^circ {rm C}? Suppose that the air bubble is always in thermal equilibrium with the surrounding water.
An 8.m, 220 N uniform ladder rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.75, and the ladder makes a 50° angle with the ground. How far up the ladder can an 770 N person climb before the la..
An unstable high-energy particle is created in the laboratory, and it moves at a speed of 0.984c. Determine what is the proper lifetime
A skyscraper has 550 windows that each have length 2.50m and height 2.0m when the temperature is 25C. the windows are made of single-pane glas of thickness 1/2"(1.27com) mounted in an aluminum frame.
The absolute uncertainty written in the form
an inferometer consists of 50 parabolic antennas placed 14 m apart. it operates at a wavelength of 21cm. compute the
The far point of a nearsighted person is 6.3 m from her eyes, and she wears contacts that enable her to see distant objects clearly. How high is the image formed by the contacts
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