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In a photocell, ultraviolet light provides sufficient energy to some electrons in barium metal to eject them from the surface at high speed. See Fig. 23-36. To gauge the maximum energy of the electrons, another plate above the barium surface is kept at a negative sufficient potential that the emitted electrons are slowed down and stopped, and return to the barium surface. If the plate voltage is -3.02V when the fastest electrons are stopped, what was the speed of these electrons when they were emitted?
A boy uses this string to whirl a 10-kg stone in a horizontal circle of radius 10 m. The boy continuously increases the speed of the stone. At approximately illustrate what speed will the string break?
What is the annual petroleum consumption of the United States, and where does this petroleum originate? Include all sources supplying a significant fraction of the US consumption (5% or more).
An electron is suspended at a distance of 1.36 cm above a uniform line of charge. What is the linear charge density of the line of charge
A coil of 1800 turns has an induced voltage of 150 volt. Calculate the rate of flux change in Wb/s
A coil with length of 11 cm and a cross-section of 2.3 cm is connected in series with a 8.0k? resistor. A 42.0 V battery is applied across the two devices, What is the energy density inside the coil
In certain ranges of a piano keyboard, more than one string is tuned to the same note to provide extra loudness. For example, the note at 1.10 102 Hz has two strings at this frequency. If one string slips from its normal tension of 5.90 102 N to 5..
A 75 kilogram man is standing on a scale in an elevator. Determine what is the reading in Newton if the elevator is at rest? Moving up at a constant velocity of 2.0 m/s and accelerating up at 2.0 m/s
A meter stick balances horizontally on a knife-edge at the 50.0 cm mark. With two 5.00 g coins stacked over the 8.0 cm mark, the stick is found to balance at the 43.0 cm mark. What is the mass of the meter stick?
The plane of a rectangular coil, 4.0cm by 8.0 cm, is perpendicular to the direction of a magnetic field, B->. If the coil has 100 turns and a total resistance of 8.0 Ω,at what rate must the magnitude of B-> change to induce acurrent of 0.10 A in the ..
a motorcycle rider starts from rest and goes 3.75 rad counterclockwise around a circular track in 12.3 seconds.
In an insulated vessel, 260 g of ice at0°C is added to 630 g of water at19.0°C. What is the final temperature of the system? How much ice remains when the system reaches equilibrium?
Two slits are illuminated by a 390 nm light.The angle between the zeroth-order bright band at the center of the screen, how far apart is this bright band from the central peak
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