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
Katarina [22]
4 years ago
14

3. An electron with a mass of 9.11 X 10^-31 kg is moving at a speed of 2.19 X 10 m/s. What is the kinetic energy of the electron

?
Physics
1 answer:
max2010maxim [7]4 years ago
7 0

Answer:

2.18\times 10^{-30} \:J

Explanation:

K.E._{Electron}= \frac{1}{2} mv^2 \\\\= \frac{1}{2} \times 9.11\times 10^{-31}\times (2.19\times 10)^2 \\\\=4.555\times 10^{-31}\times 4.7961\times 10^2 \\\\=4.555\times 10^{-31+2}\times 4.7961 \\\\=21.8462355\times 10^{-29}\\=2.18462355\times 10^{-30}\\=2.18\times 10^{-30} \:J\\

You might be interested in
Monochromatic light is incident on a grating that is 75 mm wide and ruled with 50,000 lines. the second-order maximum is seen at
DIA [1.3K]

Answer:

The wavelength of the incident light is \lambda = 400 nm

Explanation:

Given data

Distance between the sits

d = \frac{0.075}{50000}

d = 1.5 × 10^{-6} m

\theta = 32.5°

m = 2

We know that the wavelength of the incident light is given by

\lambda = \frac{d\sin \theta}{m}

Put all the value in above formula we get

\lambda = \frac{1.5 (\sin 32.5)}{2}×10^{-6}

\lambda = 4 × 10^{-7} m

\lambda = 400 nm

Therefore the wavelength of the incident light is \lambda = 400 nm

4 0
4 years ago
A flat, rectangular coil consisting of 60 turns measures 23.0 cmcm by 34.0 cmcm . It is in a uniform, 1.40-TT, magnetic field, w
Travka [436]

Answer:

(a)   ΔФ = -0.109W

(b)  emf = 28.43V

(c)   Iin = emf/R

Explanation:

(a) In order to calculate the magnetic flux you use the following formula:

\Delta\Phi_B=\Phi-\Phi_o=BAcos(90\°)-BAcos(0\°)   (1)

B: magnitude of the magnetic field = 1.40T

A: area of the rectangular coil = (0.23m)(0.34m)=0.078m^2

Where it has been taken into account that at the beginning the normal vector to the cross sectional area of the coil, and the magnetic field vector are parallel. When the coil is rotated the vectors are perpendicular.

Then, you obtain:

\Delta\Phi_B=(1.40T)(0.078m^2)=-0.109W

The change in the magnetic flux is -0.109 W

(b) During the rotation of the coil the emf induced is given by:

emf=-N\frac{\Delta \Phi}{\Delta t}         (2)

N: turns of the coil = 60

ΔФ: change in the magnetic flux = 0.109W

Δt: lapse time of the rotation = 0.230s

You replace the values of the parameters in the equation (2):

emf=-(60)(\frac{-0.109W}{0.230s})=28.43V

The induced emf is 28.43V

(c) The induced current in the coil is given by:

I_{in}=\frac{emf}{R}      (3)

R: resistance of the coil     (it is necessary to have this value)

emf :induced emf  = 28.43V

7 0
4 years ago
Explain why a ping pong ball and bouncy ball of the same size have different weights
user100 [1]

Answer:

the material

Explanation:

weight is defined as the amount of force on the object because of gravity. ping pong balls and bouncy balls are made out of different materials that are different weights. most bouncy balls are also not hollow, unlike ping pong balls. these factors affect the weight of these objects.

8 0
3 years ago
Alkaline batteries have the advantage of putting out constant voltage until very nearly the end of their life. How long will an
Sidana [21]

Answer:

Explanation:

Voltage, V = 1.58 V

Power, P = 1 W

1 A.h

Charge, Q = 1 A.h = 1 x 3600 A.s = 3600 C

Power x time = Voltage x charge

1 x t = 1.58 x 3600

t = 1.58 x 3600 second

t = 1.58 hours

8 0
4 years ago
The element niobium, which is a metal, is a superconductor (i.e., no electrical resistance) at temperatures below 9 K. However,
Andreyy89

Answer:

note:

find the attached solution

4 0
3 years ago
Other questions:
  • Question 2 Unsaved Which of these natural resources is nonrenewable? Question 2 options: hydroelectric coal corn geothermal
    15·1 answer
  • How to understand physics
    5·1 answer
  • A Force of 20N displaces a body about 45m how much work is done?​
    13·2 answers
  • Light can be described as a wave or as a particle known as a photon. The speed of light c is 3.00 ✕ 108 m/s. (a) Sirius is the b
    9·1 answer
  • I push a box with mass 10 kg across a 15 m room. If I apply a force of 20N to do this how much work is being done on the box?
    7·1 answer
  • HURRY UPPPPPPPPPPPPPPPP(and don't give me incomplete answers)
    14·1 answer
  • the mass of a brick is 4 kg, find the mass of water displaced by it when completely immersed in water.​
    5·1 answer
  • how do the linear momentum and kinetic energy of the two-atom system after the collision compare to these quantities before the
    7·1 answer
  • I need help. Please just help me.
    9·1 answer
  • What factors can cause an induced current in a wire loop through which a magnetic field passes?.
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!