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Physicians use a machine called a spirometer to measure the maximum amount of air a person can exhale (called the forced vital capacity). Suppose you can exhale 4.0L . How many kilograms of air do you exhale? Assume that the density of air is 1.3 kg/m3.
How much work did the movers do (horizontally) pushing a 190-{rm kg} crate 11.2 m across a rough floor without acceleration, if effective coefficient of friction was 0.60.
A typical flashlight battery will produce a 0.50-A current for about 3 h before losing its charge. Determine the total number of electrons
A puck slides along the frictionless track shown in the figure with an initial speed of 7.40. Suppose the puck turns all corners smoothly, with no loss of speed.
An elevator is moving upward with a speed of 11 m/s.Three seconds later, the elevator is still moving upward, but its speed has been reduced to 5.0m/s what is the average acceleration of the elevator during the 3.0 s interval
You throw a ball with mass 0.40 kg against a brick wall. It hits the wall moving horizontally to the left at 30. m/s, find the average horizontal force the wall exerts on the ball during the impact
You need to construct an RC circut with a time constant of .25s and you are given a selection of 1, 10, 100, and 1000Ohms resistors and a selection of 1, 10, 100, and 1000 micro Faradays Capacitors.
A hot-air balloon is ascending at the rate of 14 m/s and is 57 m above the ground when a package is dropped over the side. (a) How long does the package take to reach the ground? (b) With what speed does it hit the ground?
A simple pendulum is made from a 0.739-m-long string and a small ball attached to its free end. how much time elapses before it attains its greatest speed
A woman stands on a bathroom scale in a motionless elevator. When the elevator begins to move, Find the direction of the acceleration
What is the rms speed of the molecules in low-density hydrogen gas at 0 ^circ {rm C}? (The mass of a hydrogen molecule, rm{H_2} , is 3.32×10-27 kg ).
Four gram-moles of an ideal monatomic gas initially at temperature 300 K is compressed adiabatically from a volume of 1200 cm3 to a volume of 350 cm3. How much heat was transferred to the gas
A rock of mass 34 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 248 N. Elucidate what is the magnitude of the acceleration of the rock?
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