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You exhale at the rate of 14 breaths a minute under normal conditions, each breath containing 0.50 L of air. You exhale against an external pressure of about 100 kPa.
a) Calculate the total amount of expansion work you do against the earth's atmosphere in a day.
b) If your typical intake of food is equivalent to 2500 nutritional calories (1 nutritional calorie = 4,184 J), what fraction of a day's energy consumption is this work by the lungs? [It's not this bad however, since the surroundings do work on the lungs when it contracts.]
An old mining tunnel disappears into a hillside. You would like to know how long the tunnel is, but it’s too dangerous to go inside. However, you figure out a way:
Find the magnitude of book's velocity, just before the book reaches the floor. Find the direction of book's velocity, just before the book reaches the floor.
A model rocket is launched straight upward. Its altitude y as a function of time is given by y = bt -ct2, where b = 82 m/s, c = 4.9 m/s2, t is the time in seconds, and y is in meters, (a) make use of differentiation to find out a general expressio..
Bicyclists in the Tour de France reach speeds of 34.0 miles per hour (mi/h) on flat sections of the road. What is this speed in meters per second
A steam engine has a boiler that operates at 4.90 102 K, If 3.50 103 J of energy is supplied from the boiler, find the work done by the engine on its environment
An injured monkey sits perched on a tree branch 3.0 m above the ground, while a wildlife veterinarian is kneeling down in the bushes 88.5 m away attempting to subdue the monkey with a tranquilizer gun.
The masses of the earth and moon are 5.98*1024 and 7.35*1022 kg, respectively. Identical amounts ofcharge are placed on each body, such that the net force(gravitational plus electrical) on each is zero. What is the magnitude of the charge placed on..
An extension cord made of two wires of diameter 0.129cm (no. 16 copper wire), How much power is dissipated in the cord
A charge of -3mc is fixed in a place.a particle with mass=7.20*10-3Kg and charge= -8mc is fired toward the fixed charge from initial distance=.450m.if the particles initial speedis 65m/s,how close will the particle get to the fxed charge? you may n..
The energy in a lightning bolt is enormous. Consider, forexample a lightning bolt in which 29C of charge moves through apotential difference of 1.4*108 V. With the amountof energy in this bolt, how many kilograms of water at100o C could be boiled int..
If the coefficient of static frictionbetween the bureau and the floor is 0.45, what is the minimum horizontal force a person must apply to start the bureau moving
Two protons in a molecule are 4.20e-10 m apart. Find the electric force exerted by one proton on the other
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