1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
cricket20 [7]
3 years ago
11

In a television picture tube, electrons strike the screen after being accelerated from rest through a potential difference of 27

000 V. The speeds of the electrons are quite large, and for accurate calculations of the speeds, the effects of special relativity must be taken into account. Ignoring such effects, find the electron speed just before the electron strikes the screen.
Physics
1 answer:
Vera_Pavlovna [14]3 years ago
4 0

Answer:

9.74 x 10^7 m/s

Explanation:

V = 27000 V

energy of electrons = e x V

K = 1.6 x 10^-19 x 27000 = 43200 x 10^-19 J

Energy = 1/2 m v^2

43200 x 10^-19 = 0.5 x 9.1 x 10^-31 x v^2

v^2 = 9.495 x 10^15

v = 9.74 x 10^7 m/s

You might be interested in
The lesser the mass, the greater the acceleration for the given value of force. Why does this happen?
Tju [1.3M]
Newtons law states F=ma
so F/m=a
in addition it makes logical sense the lighter an object the easier it is to accelerate its velocity form 0 to some quantity 
5 0
3 years ago
An amateur golfer swings a golf club, striking a golf ball that has a mass of 55.0 g. The club is in contact with the ball for o
Rudiy27

Answer:

The average force ≅ 519.44 N.

Explanation:

Impulse = change in momentum of a body

i.e Ft = m(v - u)

where F is the force, t is the time, m is the mass of the body, v is the final velocity and u is the initial velocity.

m = 55.0 g (0.055 Kg), t = 0.00360 s, v = 34.0 m/s, since the ball was initially at rest; u = 0 m/s

So that,

F x 0.00360 = 0.055(34 - 0)

F x 0.00360 = 0.055 x 34

                    = 1.87

F = \frac{1.87}{0.0036}

 = 519.4444

The average force exerted on the ball by the club is approximately 519.44 N.

4 0
3 years ago
5. How does a jack make changing a tire easier?
strojnjashka [21]

Answer: An jack makes changing a tire easier because it lifts up the car to get the tire off of the ground.

Explanation:

4 0
3 years ago
Which question would most likely fill in the blank
Citrus2011 [14]
Definitely not the last 2. My bet is on the first option. If it is wrong don't hit me please...
8 0
3 years ago
I NEED PHYSICS HELP ASAP! DO NOT GUESS! I WILL GIE BRAINLEIST IF RIGHT! THANKS! :D
ale4655 [162]
<span>The repelling of the support magnet decreases friction. is the answer you're looking for .  :)

hope i helped - beanz</span>
6 0
3 years ago
Read 2 more answers
Other questions:
  • Check my math please? GPE and Power lab
    5·1 answer
  • Geologists use the blank test to determine the hardness of a mineral
    10·1 answer
  • Which of the following are not typically included in the periodic table?
    12·2 answers
  • Which are examples of projectile motion?
    13·1 answer
  • Ondrea could drive a Jetson's flying car at a constant speed of 540.0 km/hr across oceans and space, approximately how long woul
    13·1 answer
  • Oceanic crust that records negative magnetic anomalies formed when the earth's magnetic field was ___________.
    15·1 answer
  • The speed limit in a school zone is 25.mph what is the speed in m/s
    15·2 answers
  • Large sections of troposphere with same temperature and humidity is called
    12·1 answer
  • A skater is spinning with his arms outstretched. He has a 2 lb weight in each hand. In an attempt to change his angular velocity
    11·1 answer
  • The van accelerates at 2.2m/s^2. The force causing the acceleration is 5.5 kN. Calculate the mass of the van
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!