A horizontally-projected beam of protons travelling at 55 km/s travels between two parallel plates separated by 7.4 cm, and 12 cm long, between which there is an electric field of 7.2 V/m upward. If the beam enters the region at a height of 3.7 cm above the lower plate, at what height above the lower plate is the beam when it exits? The proton mass is 
A. 4.4 cm
B. 3.0 cm
C. 5.1 cm
D. 2.3 cm
A. 4.4 cm
You might also like to view...
Ninety percent of all stars fuse helium to form carbon and lie on the main sequence
a. True b. False Indicate whether the statement is true or false
The least massive particle of matter is now thought to be
A) the photon. B) the neutrino. C) the proton. D) the electron. E) the neutron.
A particle (mass = 4.0 g, charge = 80 mC) moves in a region of space where the electric field is uniform and is given by Ex = ?2.5 N/C, Ey = Ez = 0 . If the velocity of the particle at t = 0 is given by vx = 80 m/s, vy = vz = 0, what is the speed of the particle at t = 2.0 s?
a. 40 m/s b. 20 m/s c. 60 m/s d. 80 m/s e. 180 m/s
In projectile motion, which of the following is not constant?
a. Vertical velocity b. Horizontal velocity c. Acceleration d. None of these