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Observe yourself breathing and count the number of times you inhale per second. During each breath you probably inhale 0.58L of air. Assume the pressure is 1 atm and the temperature is 20°C. Only about 21% of air is O2. How many oxygen molecules do you inhale if you are at sea level?
question1a person doing a chin-up weighs 725 n disregarding the weight of the arms. throughout the first 20.0 cm of the
Show that the boundary conditions far away from the cylinder
What is the efficiency of a pump that uses 3.5kW of electrical power in raising 200 litters of water through a height of 12m in 10 seconds
Two cars are traveling along a straight line in the same direction, the lead car at 25.2m/s and the other car at 31.0m/s. At the moment the cars are 41.9m apart, the lead driver applies the brakes, causing her car to have an acceleration of -2.07m..
A light plane attains an airspeed of 480 km/h. The pilot sets out for a destination 830 km due north but discovers that the plane must be headed 24.0° east of due north to fly there directly
The wave function for a wave on a taut string is given by y(x,t)=(0.350m) sin (10pi(t)-3pi(x)+pi/4), What is the energy contained in each cycle
A clean copper surface is exposed to light of wavelength 275 nm. What is the maximum speed of the photoelectrons emitted from this surface? Use the table below copper=4.7eV.
What is the magnitude of the total linear acceleration of a piece of metal on the very outer edge of the flywheel 4.1 seconds after it started to rotate
A charge of -3.0 nC is at the origin and a second charge of 13.0 nC is at x = 8.00 m. Find the magnitude and direction of the electric field halfway in between the two charges.
Suppose 2.5 cubic meter of oil is spilled into the ocean. Find the area of the resulting slick, assuming that it is one molecule thick
A 0.55 kg air cart is attached to a spring and allowed to oscillate. You are given the displacement of the air cart from equilibrium to be x = (19.7 cm) cos[(2.64 s-1)t + ?]. Find the maximum kinetic energy of the cart
A person who weighs 68 kg steps onto a spring scale in the bathroom, and spring compresses by 0.79cm. (a) what is the spring constant? (b) What is the weight of another person who compresses the spring by 0.34cm.
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