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A boy flies a kite with the string at a 30 degree angle to the horizontal. The tension in the string is 4.5N. How much work does the string do on the boy if the boy: Stands still? Walks a horizontal distance of 11m away from the kite? Walks a horizontal distance of 11m toward the kite?
The pulmonary artery, which connects the heart to the lungs, has a radius of 2.6 mm and is 8.4 cm long. what is the speed of the blood in this artery
The position of a particle moving along an x axis is given by x = 17t2 - 6.0t3, where x is in meters and t is in seconds. What is the maximum positive coordinate reached by the particle
What is the terminal speed at which the bar falls? Imagine the bar remains horizontal and in contact with the rods at all times.
The 9 inch long elephant nose fish in the Congo River generates a weak electric field around its body using an organ in its tail. How many electrons would be required to create that charge
Two point charges q and 4q are at x=0 and x=L, respectively, and free to move. A third charge is placed so that the entire three-charge system is in static equilibrium. What is the magnitude of the third charge
The distance between atoms in a solid is typically around 2.0 x 10-10 m What is the wavelength of an electron with a kinetic energy of 110 eV
The four masses shown in the figure are connected by massless, rigid rods, Find the coordinates of the center of gravity
A professor's office door is 0.95 wide, 2.2 high, 4 thick; has a mass of 22 , and pivots on frictionless hinges. A "door closer" is attached to door and the top of door frame. When the door is open and at rest, the door closer exerts a torque of 5..
Consider neon, a noble gas whose molecules consist of single atoms of atomic mass 0.02 kg/mol. Avogadro's number is 6.02 × 1023 mol-1, what is the average kinetic energy of a neon atom
A child's water pistol shoots water through a 1.0mm -diameter hole. What is the volume flow rate during the squirt
An uncharged spherical conducting shell surrounds a point charge - q at its centre. Then a charge +3q is placed on the outside surface of shell.
You and a friend are sitting in the bleachers of a major league baseball park,132m from home plate on a day when the temperature is 20° C. How much later does the other person hear the sound
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