Crossed electric and magnetic fields can be used to select one speed for which charged particles in a beam moving perpendicular to the fields will pass through the fields without being deflected. what value of the electric field e should be used in a velocity selector to pick out protons whose kinetic energy is 1,000 ev when the magnetic field b = 8.0 t? the mass of a proton is 1.67 x 10-27 kg. recall that 1.0 ev = 1.6 x 10-19 joules.
a) 3.5 x 1o v/m
b) 21,900 v/m
c) 43,800 v/m
d) 0.22 v/m
e) 3.1 x 10 v/m

Acatapult is tested by roman legionnaires. they tabulate the results in a papyrus and 2000 years later the archaeological team reads (distances translated into modern units): range = 0.4 km; angle of launch = π/5 rad; landing height = launch height. what is the initial velocity of launch of the boulders if air resistance is negligible?

Answer as quick as ! kate is working on a project in her tech education class. she plans to assemble a fan motor. which form of energy does the motor convert most of its electric energy into? a. light energyb. motion energyc. sound energyd. thermal energy

Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)