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
marshall27 [118]
3 years ago
7

The standard kilogram is a platinum-iridium cylinder 39.0 mm in height and 39.0 mm in diameter. What is the density of the mater

ial?
Physics
1 answer:
KengaRu [80]3 years ago
7 0

Density is mass per unit of volume, usually measured in g/cm³. So first determine the volume of the cylinder:

<em>v</em> = <em>π</em> <em>r </em>² <em>h</em> = <em>π</em> ((39.0 mm) / 2)² (39.0 mm)

<em>v</em> = 59,319/4 <em>π</em> mm³ ≈ 46,589 mm³ ≈ 46.589 cm³

Then the density is

<em>ρ</em> = <em>m</em> / <em>v</em>

<em>ρ</em> = (1 kg) / <em>v</em> = (1000 g) / <em>v</em>

<em>ρ</em> ≈ 21.464 g/cm³

Or, if you want to preserve the given units, that's

<em>ρ</em> ≈ 0.00002146 kg/mm³

You might be interested in
If an organism didn't have DNA, it would be missing which sign of life ? a, b , c
sergey [27]

Answer:

A

Explanation:

4 0
3 years ago
Read 2 more answers
Question 6 of 10
Anni [7]
The answer is c or b u choose
6 0
3 years ago
The coordinates of a bird flying in the xy-plane are given by x(t)=αt and y(t)=3.0m−βt2, where α=2.4m/s and β=1.2m/s2.part a:Cal
8090 [49]
Α=2.4 \frac{m}{s}

β=1.2 \frac{m}{s^2}

x(t)=at

y(t)=3-βt^2

Vx(t)=α

Vy(t)=-2βt

vectorV=[α;-2βt]

ax(t)=0

ay(t)=-2βt

vector a [0;-2βt]


3 0
3 years ago
A swimmer is capable of swimming 0.42 m/s in still water. part a if she aims her body directly across a 66-m-wide river whose cu
satela [25.4K]
<span>If the swimmer is swimming perpendicular to the current, it will take her 66m / 0.42 m/s = 157.14 seconds to cross the river. At the same time, the current will be taking her downstream at a rate of 0.32 m/s. So, when she reaches the opposite bank, her total downstream distance traveled will have been 0.32*157.14 = 50.28 meters.</span>
3 0
3 years ago
HELP PLEASE
Ira Lisetskai [31]
The answer is magnet away from the coil
3 0
3 years ago
Read 2 more answers
Other questions:
  • In which organelle does photosynthesis take place
    12·2 answers
  • What are 2 different ways you can improve your endurance, muscular strength, flexibility, and body composition before your next
    5·1 answer
  • The spring of a toy car stores 10 J of potential energy. Only 8 J of energy changes to kinetic energy as the car moves. What hap
    10·1 answer
  • Plz help will give brainliest and ten points
    14·1 answer
  • A straight vertical wire carries a current of 1.0 A into the page in a region where the magnetic field strength is 0.60 T. What
    7·1 answer
  • Which of of the following is a physical change ice melting into a puddle of water,Leaves changing color in fall, Or baking a cak
    10·1 answer
  • the force between your feet and the floor is greater while standing on your tiptoes than while standing flat on your feet
    10·2 answers
  • ) The rate of submergence is the total change in the elevation of the pier (two m) divided by the total amount of time involved
    15·1 answer
  • Along the remote Racetrack Playa in Death valley, California, stones sometimes gouge out prominent trails in the desert floor, a
    8·1 answer
  • Need an actual answer, no links.
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!