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Approximately how many atoms thick is a cell membrane, assuming all atoms there average about twice the size of a hydrogen atom?
a proton is released from rest inside a region of constant uniform electric field e1 pointing due north. 22.3 seconds
A 10 kg block of ice has a temperature of -8°C. The pressure is one atmosphere. The block absorbs 4.20 106 J of heat. What is the final temperature of the liquid water?
A meteor that falls to earth from a great distance has a speed of 11 km/s. In class we found that the temperature of an iron meteor is 290,000K. We assumed all of the energy heats the meteor and none of it is transferred to the surroundings.
A wire of initial length L0 and radius r0 has a measured resistance of 2.0 . The wire is drawn under tensile stress to a new uniform radius of r = 0.45r0. What is the new resistance of the wire
An air spaced parallel plate capacitor is connected to a 12 v battery. If a slab of pyrex glass is inserted between the plates filling the gap, find the new capacitance of the capacitor
The coeffiecient of static friction between Jimmy's hand and his tennis racket is 0.45. How hard must he squeeze the racket if he wants to exert a force of 200 N along the longitudinal axis of the racket
The depth of the potential well for free electrons in a metal can be correctly determined with observing that the photoelectric work function is the energy necessary to remove an electron at the top of the occupied states from the metal;
A projectile is launched with a speed of 40m/s at an angle of 60 degrees above the horizantal. use concervation of energy to find the maximum height reached by the projectile during its flight?
copper has 8.5 x 10^28 electrons per cubic meter. a 12-gauge copper wire is 25.0cm in length and 2.05mm in diameter. what is the average drift speed of the electrons along the wire
In a pickup game of dorm shuffleboard, students crazed by final exams use a broom to propel a calculus book along the dorm hallway. If the 2.7 kg book is pushed from rest through a distance of 0.70 m by the horizontal 32 N force from the broom and..
A charge of -2.95 µC is fixed at the center of a compass, What are the magnitude and direction of the net electrostatic force acting on the charge at the center
The Hamiltonian of a system of two (spin- 1/2) electrons, H= ?1?z1+?2?z2 where ?z is the Pauli Matrix, ? is an energy parameter and our subscripts represent the two electrons 1 and 2. What is the basis where this Hamiltonian is diagonal and what is t..
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