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Electrons can be “boiled off” of a wire by heating the wire to sufficiently high temperature (typically well over 1000? C). Typically the electrons leave the wire with a fairly low speed which can be approximated as zero. In many devices where this is done the hot wire is also maintained at some voltage which causes the electrons to accelerate away from the wire.Suppose electrons are boiled off of a wire that is held at an unknown voltage. The electrons accelerate away and eventually hit a metal plate which is grounded. By convention we define the grounded plate as having V = 0.(a) Is the voltage at the hot wire positive or negative? Explain.(b) There are various ways that we could measure the speed of the electrons as they impact the grounded plate. Suppose we determine that the electrons have a speed of 2.96 × 107 m/s just before hitting the plate. What is the voltage at the hot wire?
A cannonball (20kg) is shot from a cannon(200kg) with a velocity of 20m/s. what is the backwards velocity of the cannon
The linear acceleration of the center of mass of a yo-yo is 2.0m/s^2 as it rolls by gravity down its string. what is its rotational inertia
The electric field at 0.50 m away from the center of a thin metallic spherical shell of radius 0.30 m is - 400×10^3 V/m. the charge density at the outer surface of the sphere is:
A container has a pressure of 4 atmospheres and is at the temperature of 200 degrees celsius, what is the average distance between molecules (assume container is a cube)
A converging lens with focal length of 11.8 cm is placed in contact with a diverging lens with a focal length of 21.1 cm. What is the focal length of the combination
A block with mass m1=2.00 kg rests on a frictionless table. It is connected with a light string over a pulley to a hanging block of mass m2=4.00 kg. What is the angular speed of the pulley at this time
A 1590 kg satellite orbits the Earth at an altitude of 50.4 km. It is desired to increase the altitude of the orbit to 298 km, How much energy must be added to the system to effect this change in alti- tude
Two and one-half kg of ice at temperature T' = 0ºC is melted into water at the same temperature by placing it in contact with a reservoir at temperature TR = 20.0ºC. find the change in entropy of the ice that was melted
A jogger accelerates from rest to 3.49 m/s in 2.40 s. A car accelerates from 21.0 to 31.8 m/s also in 2.40 s, Find the magnitude of the acceleration of the jogger
A gamma ray photon produces an electron-positron pair each with a kinetic energy of 210 KeV. What was the energy and wavelength of the photon
A boat is traveling upstream at 20 km/h with respect to the water of a river. The water is flowing at 4.0 km/h with respect to the ground. What is the speed of the boat with respect to the ground
define what is the unknown capacitance. what focal length eyepiece should she use.
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