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
Bad White [126]
2 years ago
9

As a glacier melts, the volume V of the ice, measured in cubic kilometers, decreases at a rate modeled by the differential equat

ion dVdt=kV , where t is measured in years. The volume of the glacier is 400km3 at time t=0 . At the moment when the volume of the glacier is 300km3 , the volume is decreasing at the rate of 15km3 per year. What is the volume V in terms of time
Physics
1 answer:
vovangra [49]2 years ago
7 0

Solve the differential equation:

d<em>V</em>/d<em>t</em> = <em>k V</em>   →   1/<em>V</em> d<em>V</em>/d<em>t</em> = <em>k</em>

→   d/d<em>t</em> [ln(<em>V</em>)] = <em>k</em>

→   ln(<em>V</em>) = <em>k t</em> + <em>C</em>

→   <em>V</em> (<em>t</em> )= exp(<em>k t</em> + <em>C </em>) = <em>C</em> exp(<em>k t</em> ) = <em>C e </em>ᵏᵗ

At <em>t</em> = 0, the glacier has volume 400 km³ of ice, so

<em>V</em> (0) = 400   →   <em>C</em> <em>e</em>⁰ = <em>C</em> = 400

Find when the glacier's volume is 300 km³:

<em>V</em> (<em>t</em> ) = 400 <em>e </em>ᵏᵗ = 300   →   <em>e </em>ᵏᵗ = 3/4

→   <em>k t</em> = ln(3/4)

→   <em>t</em> = 1/<em>k</em> ln(3/4)

At this time, the volume is decreasing at a rate of 15 km³/yr, so

<em>V '</em> (<em>t </em>) = <em>C</em> <em>k</em> <em>e </em>ᵏᵗ   →   <em>V '</em> (1/<em>k</em> ln(3/4)) = 400 <em>k</em> exp(<em>k</em> × 1/<em>k</em> ln(3/4)) = -15

→   3/4 <em>k</em> = -3/80

→   <em>k</em> = -1/20

Then the volume <em>V</em> (<em>t</em> ) of the glacier at time <em>t</em> is

<em>V</em> (<em>t</em> ) = 400 exp(-1/20 <em>t </em>)

You might be interested in
PLEASE HELP ME!
Damm [24]
<span>In physical cosmology, cosmic inflation, cosmological inflation, or just inflation, is a theory of exponential expansion of space in the early universe. The inflationary epoch lasted from 10−36 seconds after the conjectured Big Bang singularity to sometime between 10−33 and 10−32 seconds after the singularity.
I hope this helps!!!
</span>
4 0
3 years ago
Read 2 more answers
A 2.8-kg physics cart is moving forward with a speed of 45 cm/s. A 1.9-kg brick is dropped from rest and lands on the cart. The
anzhelika [568]

Hey! How are you? My name is Maria, 19 years old. Yesterday broke up with a guy, looking for casual sex.

Write me here and I will give you my phone number - *pofsex.com*

My nickname - Lovely

4 0
3 years ago
The answer<br> May someone please help me out.
Olin [163]

magnesium is an element

7 0
3 years ago
Read 2 more answers
arzan, who weighs 700 N, swings from a cliff at the end of a convenient vine thatis 20 m long. From the top of the cliff to the
vekshin1

Answer:

= 7.07 m

Explanation:

The Tarzan reaches bottom of swing after descending 2.5 m,

change in his potential energy equals his kinetic energy at bottom of swing

m g h = (1/2) m v²   ,  

hence speed v of Tarzan at bottom of swing is given as  

v = ( 2 g h )1/2

= ( 2 × 9.8 × 2.5 )1/2

= 7 m/s

At the bottom of swing, if the vine breaks, then he is moving with horizontal velocity 7 m/s in gravitational field.  

If vertical distance from ground to bottom of swing is 5 m, then time t for Tarzan to reach ground is given by

S = (1/2)g t2 or   t = (2S/g)1/2

= ( 2 × 5 / 9.8 )1/2

= 1.01 s

Horizontal distance traveled by Tarzan = 1.01 × 7

= 7.07 m

7 0
2 years ago
Why isn't iron used to make coin
AleksandrR [38]
If iron were used to make coins then it would rust easily,because of its exposure to water, air etc..
7 0
3 years ago
Read 2 more answers
Other questions:
  • Two dimensional motion is motion in :
    5·1 answer
  • A tortoise can run with a speed of 0.14 m/s, and a hare can run 20 times as fast. In a race, they both start at the same time, b
    11·1 answer
  • What is the potential energy of a 500 N weight before it falls 10 m ?
    10·1 answer
  • The product PV, where P and V represent pressure and volume respectively, is a unit for which?
    9·1 answer
  • A point charge is placed at the center of a spherical Gaussian surface. The electricflux ΦEischangedif(a) a second point charge
    5·1 answer
  • How a diode can act as a capacitor?
    6·1 answer
  • PLS HELP
    6·1 answer
  • The seed planted at extreme cold or in the region of frozen ice do not germinate, why?​
    14·1 answer
  • According to Newton’s law of universal gravitation, as the mass or one or both bodies increases, what happens to the force of at
    9·1 answer
  • 2. Which activity requires a scientist to use
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!