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A marine biologist powers the 800 W, 24 V electric outboard motor on her boart from a 75 A*hr battery. How long can she run the motor before the battery is drained?
A large plastic block has a net charge of -1.0mC. How many more electrons than protons are in the block
Estimate how much power is saved if the voltage is stepped up from 240 V to 1200 V and then down again, rather than simply transmitting at 240 V
An electron is then fired directly toward the center of the shell, from point P at distance r from the center of the shell (r >> R). What initial speed v0 is needed for the electron to just reach the shell before reversing direction.
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
two semicircular filament have a common diameter. one lies in the x-y plane and one in the x-z plane. the curved portion of each carries a uniform line charge density (rho). find the electric filed at the common cetner of the semicircles
A student holds a laser that emits light of wavelength 633nm. The beam passes through a pair of slits separated by 0.3mm, Find the speed of the first-order maxima on the screen
Mountaineers often use a rope to lower themselves down the face of a cliff (this is called rappelling). They do this with their body nearly horizontal, What tension does his rope need to support
An implanted pacemaker supplies the heart with 72 pulses per minute, each pulse providing 6.0 V for 0.65 ms. find The average power supplied by the pacemaker
An electric motor rotating a workshop grinding wheel at the rate of 106 rev/min is switched off. Assume the wheel has a stable negative angular acceleration of magnitude 1.50 rad/s2.
The punter on a football team tries to kick a football so that it stays in the air for a long "hang time". If the ball is kicked with an initial velocity of 25.0 m/s at an angle of 60.0 degrees above the ground, illustrate what is the "hang time"?
A total charge of Q is deposited on a solid metal sphere of radius R. This charge distributes itself uniformly over the surface, yielding an electrostatic field E~ perpendicular =(sigma / e0) n^ just outside the sphere and E~ = 0 everywhere insid..
The body contains many small currents caused by the motion of ions in the organs and cells. how large is the current in the heart
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