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(II) According to a simplified model of a mammalian heart, at each pulse approximately 20 $g$ of blood is accelerated from 0.25 m/s to 0.35 m/s during a period of 0.10 s. What is the magnitude of the force exerted by the heart muscle?
(I) What is the magnitude of the momentum of a 28-g sparrow flying with a speed of 8.4 m/s?
(II) A person has a reasonable chance of surviving an automobile crash if the deceleration is no more than 30 $g$'s. Calculate the force on a 65-kg person accelerating at this rate.What distance is traveled if brought to rest at this rate from 95 km/h?
(I) A 7150-kg railroad car travels alone on a level frictionless track with a constant speed of 15.0 m/s. A 3350-kg load, initially at rest, is dropped onto the car. What will be the car's new speed?
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welcome to our fourth example Video, looking at intensity and decibels in this video will once again consider a speaker That puts off sound. And we're going to stand at a distance of 40 m from the speaker and we ask ourselves how what's the decibel level that we hear if the speaker has a power of 1200 lots? Okay, so 1200 watt speaker, we're standing 40 m away. What do we hear? So we have decibels is equal to 10 decibel times Log base 10 of I over I not well. We know that eyes going to be equal to p over four pi r squared, which in this case will be 1200 watts divided by four pi times 40 meters. Quantity squared. Okay, so we can calculate that. Plug it in. Remember that I not is our baseline intensity of one times 10 the negative 12 watts per meter squared. So if you're worried because this was a small number, notice that we're dividing by an extremely small number here. Okay, And then you'll take the log based 10 of that, multiply by 10, and you will have the decibel level that you want
Thermal Properties of Matter
The First Law of Thermodynamics
Kinetic Theory Of Gases
The Second Law of Thermodynamics