A vacuum cleaner is about 100 times as loud as ordinary conversation as measured in W/m...
A vacuum cleaner has a measured sound level of 62.3 dB.What is the intensity of this sound?Answer in units of W/m^2.
A vacuum cleaner is plugged into a 120 V (rms) wall outlet and uses an average power of 3,150 W. If the power company charges $0.18 per kWh, how much does it cost to run the vacuum cleaner for 45 minutes?
9. Sound levels are measured by the logarithmic decibel scale, named after Alexander Graham Bell. The sound level, L, corresponding to an intensity of I, in watts per square metre, is し= 10 log-, where lo is the minimum intensity audible to the human ear. If amplified rock music has a loudness of 120 dB and ordinary conversation has a loudness of 50 dB, how many times louder than ordinary conversation is amplified rock music? 9. Sound levels are measured...
1. If the density of dust collected by a single passage of a vacuum cleaner is given by d(x,y) = 5 + xy (k/m), how much dust would be collected by a vacuum cleaner traveling counterclockwise along the upper half of a semi-circle of radius 2 centered at the origin? 2. Find the work done by the force field F = 27 +227 + zkon a particle traveling from (0, 2, -1) to (2,1,1) along a straight line. 3. Are...
The sound level measured in a room by a person watching a movie varies from 50 dB to 100 dB during a loud part. Approximately how many times louder is the latter sound? In a student laboratory exercise, the wavelength of a 30,000 Hz wave is measured to be 1.085 cm. Find the air temperature.
Question: Cicadas are loud flying insects that emerge en masse. Imagine you measure the sound level of a single male cicada to be 88.4 dB when your sound meter is 0.617 m from it. Only male cicadas make such loud noises. It is actually possible for cicadas to damage your hearing, you can learn more about how they make noise here. Part 1) What is the intensity of the sound produced by the cicada? I= W/m2 Part 2) Exactly 69...
The decibel level of the noise from a jet aircraft is 130 dB when measured 24.8 m from the aircraft. How much sound power does the jet aircraft emit? Answer in units of W. How much sound power would strike the eardrum of an airport worker 24.8 m from the aircraft? Assume the diameter of the worker’s eardrum is 1.7 × 10−2 m. Answer in units of W.
The intensity of a siren is 10.9 W/m2 when you are standing 20 m away from it. Now you go 120 m away. (in other words, 6 times farther away) How loud is it now?
A population has a current size of 100 and time steps are measured in years. If λ = 1.2, how big will the population be after 4 years? A.)1076 B.)159 C.) 207 D.) 312 A species of cleaner fish removes parasites from another species of fish that is much bigger in size. The big fish keeps cleaner fish predators away. This type of species interaction is classified as: A.) Mutualism B.) Competition C.) Neutralism D.) Antagonism It is estimated that...
The following guidelines outline the basic template for a robot vacuum cleaner game. The game must be implemented in c programming language. It mimics a robotic vacuum cleaner. The code must only use the following libraries: #include <math.h> #include <stdlib.h> #include <string.h> #include <limits.h> and any .graphics and .timers libraries. The guidelines are outlined as follows: Terminal Set-up: you may assume that the terminal will be quite large, for example, on the order of 150×50, or more. Status Display: The...