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Two sound sources produce sound waves. The first source has an intensity level of 38.0 W/m^2 and the second source has an intensity level that is 2.5dB greater than the intensity level of the first source. What is the intensity level of the second source?
An elevator can lift a 107 N aircraft a distance of 26 meters in 11 s. What is the power output of the elevator
q1. consider a person of mass 72 kg. what would his mass be if he was composed entirely of neutron-star material of
An entertainer, when performing a bubble trick, forms one bubble inside another. The surface tension of the bubble liquid is ?=0.04 N m-1. What is the gauge pressure in the inner bubble
A student is doing Lab 3: Motion in One Dimension. The student places 50 g on the cart and 50 g one the hanger, What happens to the acceleration
When point charges q1 = +7.0 ?C and q2 = +6.6 ?C are brought near each other, Determine the distance between the charges
At a rock concert, the engineer decides that the music isn't loud enough. He turns up the amplifiers so that the amplitude of the sound, By what percentage does the intensity increase
A 3800kg truck is parked on a 12 degree slope. How big is the friction force on the truck
You want to build a raft that can hold you (76 kg) plus some supplies (39 kg) for a long trip. how many logs do you need
You have a 96.1-cm-long copper rod with a rectangular cross section of dimensions 5.47 cm by 7.39 cm. Find the heat current* through the rod
Jason takes off from rest across level water on his jet-powered skis. The combined mass of Jason and his skis is 75 kg, What is Jason's top speed
The alpha line in the Balmer series of the hydrogen spectrum consists of light having a wavelength of 6.56 ×10-7 meter. Compute the frequency of this light.
A 390 nm thick film floats on a puddle of water. When illuminated normally with 700 nm light there is no reflection, but 400 nm light is strongly reflected. What is the film's index of refraction
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