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
bija089 [108]
2 years ago
11

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?
Physics
1 answer:
Evgen [1.6K]2 years ago
7 0

Answer:

20 m/s

Explanation:

The force experienced by a charged particle in an electric field is given by

F=qE

where, in this problem:

q=80 mC=0.080 C is the charge of the particle

E is the electric field

The electric field here has components:

E_x=-2.5 N/C\\E_y=0\\E_z=0

So the components of the force experienced by the particle are:

F_x=qE_x=(0.080)(-2.5)=-0.2 N\\F_y=0\\F_z=0

Now we can find the components of the acceleration experienced by the particle, using Newton's second law of motion:

a=\frac{F}{m}

where

m = 4.0 g = 0.004 kg is the mass of the particle

The 3 components of the acceleration are:

a_x=\frac{F_x}{m}=\frac{-0.2}{0.004}=-50 m/s^2\\a_y=0\\a_z=0

Now we can find the components of the velocity of the particle at time t using the suvat equation:

v=u+at

where:

u_x=80 m/s\\u_y=0\\u_z=0

are the initial components of the velocity

Therefore, at t = 2.0 s, we have:

v_x=u_x+a_xt=80+(-50)(2.0)=-20 m/s\\v_y=u_y+a_yt=0+0=0\\v_z=u_z+a_zt=0+0=0

And so, the speed of the particle is the magnitude of the final velocity:

v=\sqrt{v_x^2+v_y^2+v_z^2}=\sqrt{(-20)^2+0+0}=20 m/s

You might be interested in
You want to place a mirror at a blind turn on the staircase in your house. Which would be best suited for this purpose?
Eduardwww [97]
You can't see beyond a blind turn, so a mirror would allow you to see around the corner.
6 0
3 years ago
(100 pts)<br>Why can't you use distance divide by time to calculate the instantaneous<br>speed?​
Fiesta28 [93]

Answer:

Instantaneous speed means speed at any instant

that means Speed is changing with time

You know speed is distance/time

So that means distance is also changing with time

So we take infinitesimal small distance per infinitesimal small time As we assume speed is constant in infinitesimal small time dt

So, we take speed = ds/dt

ds = infinitesimal small distance

dt = infinitesimal small time

As its ratio is equal to speed at any instant

Note : We are taking infinitesimal small distance

But :) we are taking infinitesimal small time also

As you know if denominator is small fraction is large So fraction always give large value

So it's not O ( this makes confuse to most of students)

So, thanks

Good question

Keep thinking like this :)

4 0
3 years ago
Read 2 more answers
Help is requested. Will give brainliest to anyone who answers correctly. 
sp2606 [1]
The answer should be d because they are constantly rotating
4 0
3 years ago
When one person shouts at a football game, the sound intensity level at the center of the field is 58.4 dB. When all the people
Tanzania [10]

Answer:

The number of people at game are approximately 22909

Explanation:

Given data

When one person shout \beta _{1}=58.4dB

When n number of person shout together \beta _{n}=102dB

The sound intensity level during one person shout is given by:

\beta _{1}=10log(\frac{I_{1}}{I_{o}} )\\58.4=10log(\frac{I_{1}}{I_{o}} )\\5.84=log(\frac{I_{1}}{I_{o}} )\\\frac{I_{1}}{I_{o}} =10^{5.84}\\I_{1}=10^{5.84}*I_{o}

The sound intensity level during n number of person shout is given by:

\beta _{n}=10log(\frac{I_{n}}{I_{o}} )\\102=10log(\frac{I_{n}}{I_{o}} )\\10.2=log(\frac{I_{n}}{I_{o}} )\\\frac{I_{n}}{I_{o}}=10^{10.2}\\I_{n}=10^{10.2}*I_{o}

Since each person generates same sound intensity and hence total number  of persons can be determined as

 =\frac{I_{n}}{I_{1}}\\ =\frac{10^{10.2}I_{o}}{10^{5.84}I_{o}} \\=22909

Hence

The number of people at game are approximately 22909

3 0
3 years ago
Read 2 more answers
An elevator weighing 2,200 lbs is raised one story in 20 seconds. If the distance between stories is 10 feet, the power is devel
kaheart [24]

Answer: 1100 ft lb/s and 2 H.P

Explanation:

To calculate for the power developed in the elevator motor in ft.lb/s, we multiply the distance and the weight of the elevator and divide the product by the time.

                      Power = (10 ft)(2200 lb) / 20 s = 1100 ft.lb/s

Next, convert the calculated value to HP. 

                             1100 ft.lb/s x (1 HP/ 550 ft.lb/s) = 2 HP

hope this helps please give brainliest!

5 0
3 years ago
Other questions:
  • Based on how stars are named, which star is probably brightest
    11·2 answers
  • A 20-kg barrel is rolled up a 20-m ramp to the back of a truck whose floor is 5.0 m above the ground. What work is done in loadi
    7·1 answer
  • The terms sanity and insanity:
    10·2 answers
  • A capacitor consists of two parallel plates, each with an area of 17.0 cm2 , separated by a distance of 0.150 cm . The material
    15·1 answer
  • A 0.71 W point source emits sound waves isotropically. Assuming that the energy of the waves is conserved, find the intensity (a
    9·1 answer
  • A gas has an initial volume of 168 cm3 at a temperature of 255 K and a pressure of 1.6 atm. The pressure of the gas decreases to
    11·1 answer
  • A stone is thrown horizontally with an initial speed of 10 m/s from the edge of a cliff. A stopwatch measures the stone's trajec
    11·1 answer
  • Pls help asap
    13·2 answers
  • What was the collective name for the four ancient sporting tournaments in Greece?<br> Olympic Games
    15·2 answers
  • ___________ have the highest rates of star formation
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!