electron mass, assume that the proton remains at rest. By calculating the work done on the electron by the electrostatic force, determine the distance between the two particles when the electron instantaneously has speed 3vj. An electron is projected with an initial speed v = 2.95 x 105 m/s directly toward a very distant proton that is at rest. Because the proton mass is large relative to the Unitsnm Number To.o000000000000735

2. In proton-beam therapy, a high-energy beam of protons is fired at a tumor. The KE of the protons is used to kill cells in the tumor. For one patient, it is desired to deposit 0.1 J of proton energy into a tumor. To create the beam, proton at rest are accelerated through a potential difference of 10 MV (megavolts). a) What is the KE of a single proton fired at the tumor? b) How many protons must be fired at the tumor? ans. 6.25×1010 protons

A proton's speed as it passes point A is 4.00×104 m/s. It follows the trajectory shown in the figure. What is the proton's speed at point B?

Q8. Assume the electric potential at the negatively charged plate is zero. Clearly show all work! a) A charged particle A with charge + 0.020 C and mass 3.0x10-8 kg is at rest as shown next to the positive plate which has electric potential of 120 V. What is its kinetic energy when it reaches the negatively charged plate? What is its speed? b) Another charged particle B with charge + 0.060 C and mass 3.0x10-8 kg is at rest as shown. What is its kinetic energy when it reaches the negatively charged plate? What is its speed? c) A third charged particle C (not shown) with charge 0.070 C and mass 3.0x10-8 kg is at rest in the middle of the two parallel plates. How much work is needed to move it to the positively charged plate? Is the work positive or negative? 0 0 0 0 0 0 0 0