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A typical adult human lung contains about 330 million tiny cavities called alveoli. Estimate the average diameter of a single alveolus. Suppose the alveoli are spherical and a typical human lung is about 2 liters.
A winch is used to drag a 300 N crate up a ramp at a constant speed of 68.0 cm/s by means of a rope that pulls parallel to the surface of the ramp. If the rope were suddenly to snap, what would be the acceleration of the crate immediately after the..
a 32 g block of ice is cooled to -75 degreescelsius. it is added to 511 g of water in a 71 g copper calorimeter at a
A catapult launches a rock at a 30 degree angle with respect to thehorizontal. Find the maximum height attained if the speed of therock at its highest point is 30 m/s
A 0.73-kg mass is hanging from a spring with spring constant 13 N/m. What is the resulting period of the oscillation
A sled is dragged along a horizontal path at a constant speed of 1.5 m/s by a rope that is inclined at an angle of 30.0° with respect to the horizontal, How much work is done by the rope on the sled
A cylinder in a car engine takes Vi = 4.50 10-2 m3 of air into the chamber at 30° C and at atmospheric pressure. What is the new temperature of the air
A student has built a 20-cm-long pinhole camera for a science fair project. She wants to photograph the Washington Monument, How far should she stand from the Washington Monument
A 155 g copper bowl contains205 g of water, both at 20.0°C. Avery hot 300 g copper cylinder is dropped into the water, causingthe water to boil, with 5.40 g beingconverted to steam.
A photon with a wavelength 4.80pm scatters from an electron initially at rest. Find the maximum kinetic energy for the scattered electron. Find the wavelength of the scattered photon when the scattered electron has its maximum kinetic energy
A physics student wants to build a spring gun that when aimed horizontally will give a 30.0- g ball an initial acceleration of 'g' by releasing a spring that has been compressed 14.0 cm. What spring constant is necessary? What is the velocity of the ..
In a physics lab experiment, a student immersed 201 one cent coins (each having a mass of 3.00) in boiling water. After they reached thermal equilibrium, she quickly fished them out and dropped them into 0.240 of water at 20 in an insulated contai..
In the H atom the radius of orbit B is 16 times greater than the radius of orbit A. What is the total energy of the electron in orbit B
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