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The density of air under standard laboratory conditions is 1.29{\rm kg}/{\rm m}^{3} , and about 20.0\% of that air consists of oxygen. Typically, people breathe about .5 L of air per breath.How many grams of oxygen does a person breathe in a day?
A ball on the end of a string is revolved at a uniform rate ina vertical circle of a radius 72.0cm. calculate the tension in the string when the ball isat the top of its path
A copper-constantan thermocouple generates a voltage of 4.75 x 10-3 volts when the temperature of the hot junction is 110 °C, what is the temperature in degrees Celsius of the hot junction
A 9kg block is connected by a string over a light pulley to a 5kg block that is sliding over a flat table (i.e. the 9kg is pulling the 5kg off the table). If Co-efficient of kinetic friction is 0.200, find the tension in the string.
A blue car with mass mc = 480.0 kg is moving east with a speed of vc = 23.0 m/s, obtain the magnitude of the initial momentum of the car
A bullet with a mass of 4.95 g and a speed of 940 m/s penetrates a tree horizontally to a depth of 6.15 cm. Calculate the magnitude of this frictional force
how much kinetic energy does each electron have. Blocks of mass m_1 and m_2 are connected by a massless string that passes over the pulley.
Consider an infinite solenoid of radius R, n turns per unit length, and current I. Calculate the final cinetic moment of each of the cylinders
Two traveling sine waves, identical except for a phase difference of phi, What is the phase difference between the two waves
The blackbody radiation emitted from a furnace peaks at a wavelength of 3.0 10-6 m (0.0000030 m). What is the temperature inside the furnace
A disk of radius 217 cm rotates about its axis. Points on the disk\'s rim undergo tangential acceleration of magnitude 2.31 m/s2. what is the tangential speed, v, of a point on the rim
What is the resulting compressional force on Earth. Two loudspeakers, A and B, are driven by the same amplifier and emit sinusoidal waves in phase.
The height of a helicopter above the ground is given by h = 3.00 t3, where h is in meters and t is in seconds. After 2s, the helicopter releases a small mailbag. How long after its release does the mailbag reach the ground.
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