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
Alika [10]
3 years ago
5

An elevator is initially moving upward at a speed of 12.00 m/s. the elevator experiences a constant downward acceleration of mag

nitude 4.00 m/s2 for 3.00 s. (a) find the magnitude and direction of the elevator’s final velocity. (b) how far did it move during the 3.00 s interval?
Physics
1 answer:
harina [27]3 years ago
8 0
The two equations used in this problem is from the derived equations of rectilinear motion at a constant acceleration. 

a = (v - v₀)/t
2ax = v² - v₀²
where
a is the acceleration
x is the distance 
v is the final velocity
v₀ is the initial velocity
t is the time

Part a.) The acceleration is negative because it is moving downward: a = -4 m/s². The initial velocity is v₀ = 12 m/s and t is 3 s.

-4 = (v - 12)/3
v = 0 m/s
Thus, after 3 seconds the elevator comes to a stop.

Part b.) 

2(-4)x = 0² - 12²
x = 18 m
The elevator has traveled a distance of 18 m within 3 seconds.
You might be interested in
Answer this plsss<br> A mobile phone operates at 900 MHz. <br> What wavelength does it use?
Aleks [24]

Answer:

The wavelength = 0.3333 meters at 900 MHz, therefore, = /4 = 0.08333 meters.

7 0
3 years ago
An airplane has a starting velocity of 300m/s. It then accelerates at a rate of 45m/s2 for a time of 10s. What is it's final vel
Olenka [21]
A = (v - u) / t

a = acceleration
v = final velocity
u = initial velocity
t = time

45 = (v - 300) / 10

45 × 10 = v - 300

450 + 300 = v

v = 750 m/s

Hope this helps!

P.S. Let me know if you need an explanation
8 0
3 years ago
A transform boundary occurs where two tectonic plates _____.?
gladu [14]

Where they slide over each other.

Transform boundaries are formed or occur when two plates slide past each other in a sideways motion.  They do not tear or crunch into each other (but the rock in between them may be ground up) and therefore none of the spectacular features are seen such as occur in divergent and convergent boundaries.

In a transform boundary, neither plate is added to at the boundary nor destroyed.  They are marked in some places by features like  stream beds that have been split in half and the two halves moved in opposite directions.



7 0
4 years ago
Read 2 more answers
a sound pulse emitted underwater reflects off a school of fish and is detected at the same place 0.01 s later. how far away are
andrew-mc [135]
In fresh water sound waves travel at 1497m/s at 25 degrees, I'll assume that's the characteristics of the water.

If it's 0.01s then you need to divide the speed by 100 to get the, 14.97, however it gets there and back in that time so you need to halve it.
<u>7.485m</u>
5 0
3 years ago
A country would place a tariff on imported steel to
Whitepunk [10]
. . . 'protect' its domestic steel industry, by
increasing the price of imported steel.
7 0
3 years ago
Read 2 more answers
Other questions:
  • A gas of helium atoms at 273 k is in a cubical container with 25.0 cm on a side. (a) what is the minimum uncertainty in momentum
    11·1 answer
  • WILL GIVE BRAINLIEST PLEASE I NEED THIS! A 100-kg projectile crashes through a castle wall with a kinetic energy of 266.45 kJ. W
    10·1 answer
  • What are atoms composed of
    12·2 answers
  • Why is the unit of momentum called derived unit​
    10·1 answer
  • How much force is needed to accelerate a 100 kg mass at a rate of 2.5 m/s^2
    5·1 answer
  • An installation consists of a 10-kVA, single-phase transformer with a 440-volt primary and a 110-volt, 2-wire secondary using in
    8·1 answer
  • Light would most likely be transmitted through A. A mirror B. A stone C. A leaf D. A window
    13·2 answers
  • Drag each label to the correct location on the chart. Each label can be used more than once.
    9·1 answer
  • Where would you find convergent and divergent plate boundaries relative to
    5·1 answer
  • A car starts from rest with an acceleration of 5 ft/s. What is its velocity after it has gone 600 ft?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!