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A person wears a hearing aid that uniformly increases the intensity level of all audible frequencies of sound by 30.0 dB. The hearing aid picks up sound having a frequency of 250Hz at an intensity of 3.0 x 10^-11 W/m2. What is the intensity of the sound?
A hollow, conducting sphere with an outer radius of 0.246m and an inner radius of 0.195m has a uniform surface charge density of +6.35×10?6C/m^2. find the strength of the electric field just outside the sphere
A 25 horsepower motor consumes 21 kW of electricity, Calculate the heat loss of the motor (kW) and Calculate the efficiency of the motor
At what speed does the speed of the ball change relative to the cab floor (sign and magnitude)?
A team of tornado-chasing meteorology graduate students is out in search of tornados. They drive directly toward a tornado warning siren at 25.5 m/s
Analyze various philosophical approaches for ethical decision making, and the effectiveness and limits of each approach for making ethical choices and
A solid marble, a solid disk and a hoop have the same mass (M = 0.9 kg) and the same radius. Each object is held at rest at the same height and then released. what is the force the track exerts on the hoop
A spherical balloon of volume 4.08 103 cm3 contains helium at a pressure of 1.21 105 Pa. How many moles of helium are in the balloon
Two train cars are on a straight, horizontal track. One car starts at rest and is put in motion with a constant acceleration of 1.01 m/s2. Where will the cars collide
At amusement parks, there is a popular ride where the floor of a rotating cylindrical room falls away, What is the source of the centripetal force acting on the riders
It is found that, in a certain thermal reactor, fueled with partially enriched uranium, 13% of the fission neutrons are absorbed in resonances of U238 and 3% leak out of the reactor, both while these neutrons are slowing down; 5% of the neutrons that..
A 246 kg wooden raft floats on a lake. as a 85 kg man stands on the raft, it sinks 5.0 cm deeper into the water. When he steps off, the raft vibrates for a while.
A 72.0-kg log falls from a height of 20.0 m into a lake. find the change in entropy of the air during this process
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