Older televisions display a picture using a device called a cathode ray tube, where electrons are emitted at high speed and collide with a phosphorescent surface, causing light to be emitted. The paths of the electrons are altered by magnetic fields. Consider one such electron that is emitted with an initial velocity of 1.90 x 107 m/s in the horizontal direction when magnetic forces deflect the electron with a vertically upward acceleration of 5.50 x 1015 m/s2. The phosphorescent screen is a horizontal distance of 7.2 cm away from the point where the electron is emitted. (a) How much time does the electron take to travel from the emission point to the screen? S (b) How far does the electron travel vertically before it hits the screen? cm

Question 15, Physics - equation sheet attached

Older televisions display a picture using a device called a cathode ray tube, where electrons are emitted at high speed and collide with a phosphorescent surface, causing light to be emitted. The paths of the electrons are altered by magnetic fields. Consider one such electron that is emitted with an initial velocity of 1.90 x 107 m/s in the horizontal direction when magnetic forces deflect the electron with a vertically upward acceleration of 4.90 x 1015 m/s2. The phosphorescent screen is a horizontal distance of 5.4 cm away from the point where the electron is emitted. (a) How much time does the electron take to travel from the emission point to the screen? S (b) How far does the electron travel vertically before it hits the screen? cm

A proton initially has v = 6.0 î - 3.0 ĵ + 4.0 k and then 4.0 s later has v = -3.0 î - 3.0 ĵ + 4.0 k (in meters per second). (a) For that 4.0 s, what is the proton's average acceleration aava in unit-vector notation? m/s? î + m/s? ĵ + m/s² k (b) For that 4.0 s, what are the magnitude and direction of aavg? m/s? ° (from the +x axis in the xz plane)

Q29

You are an engineer in charge of designing a new generation of elevators for a prospective upgrade to the Empire State Building. Before the state legislature votes on funding for the project, they would like you to prepare a report on the benefits of upgrading the elevators. One of the numbers that they have requested is the time it will take the elevator to go from the ground floor to the 102nd floor observatory. They are unlikely to approve the project unless the new elevators make the trip much faster than the old elevators. If state law mandates that elevators cannot accelerate more than 1.80 m/s2 or travel faster than 14.8 m/s, what is the minimum time in which an elevator can travel the 373 m from the ground floor to the observatory floor? minimum travel time: