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In a period of 1.0 s, 5.01023 nitrogen molecules strike a wall of area8.0 cm2 . If the moleculesmove at 280 m/s and strike the wallhead on in a perfectly elastic collision, find the pressure exerted on the wall. (The mass of one N2 molecule is 4.6810-26 kg.)
The temperature of a body is increased from -173 C to 357 C. What is the ratio of energies emitted by the body per second in these two cases
Amtrak's 20th-Century Limited is en route from Chicago to New York at 120km/h when the engineer spots a cow on the track. What is the magnitude of the train's acceleration
For a charged hollow metal sphere with total charge Q and radius R centered on the origin:
An electric field of 16000 N/C is directed along the positive x-axis. What is the electric force on an electron in this field
Ice at -10.0 °C and steam at 118 °C are brought together at atmospheric pressure in a perfectly insulated container. find the ratio of the mass of steam to the mass of ice
A U.S. penny has a diameter of 1.9000cm at 20.0 C . The coin is made of a metal alloy (mostly zinc) for which the coefficient of linear expansion is 2.6e-5 K^-1. What would its diameter be on a hot day in Death Valley
On a spacecraft, two engines fire for a time of 598 s. One gives the craft an acceleration in the x direction of ax = 4.92 m/s^2, while the other produces an acceleration in the y direction of ay = 7.60 m/s2. At the end of the firing period, the c..
A woman of massm=50.1kg sits on the left end of a seesaw-a plank of lengthL=3.99m-pivoted in the middle, Find the normal force exerted by the pivot if the plank has a mass ofmpl=10.2kg
You are standing in the very center of a deep, flat-bottomed valley, and shout "Hello!" If the speed of sound is 343 m/s, how wide is the valley
In an experiment on the transport of nutrients in a plant's root structure, two radioactive nuclides X and Y are used. What is the half-life of isotope X
Two people are standing on a 2.5 m longplatform, one at each end. The platform floats parallel to theground on a cushion of air, like a hovercraft. One person throws a6.6 kg ball to the other, who catches it.
A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1330 Hz. What is the speed of the bird
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