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
Deffense [45]
3 years ago
10

How many 1140 nm long molecules would you have to line up end to end to stretch a distance of 158 miles?

Physics
1 answer:
dezoksy [38]3 years ago
3 0

Answer:

221754385964.9123

Explanation:

Convert miles to nanometer

1 mile = 1.6 km

1 km = 1×10³×10³×10³×10³ nm

1 mile = 1.6×10¹² nm

So,

158 miles = 158×1.6×10¹² = 252.8×10¹² nm

Length of each molecule = 1140 nm

Number of molecules = Total length / Length of each molecule

\text{Number of molecules}=\frac{252.8\times 10^{12}}{1140}\\\Rightarrow \text{Number of molecules}=221754385964.9123

There are 221754385964.9123 number of molecules in a stretch of 158 miles

You might be interested in
A ball is in free fall after being dropped. What willthe speed of the ball be after 2 seconds of free fall?
Mazyrski [523]

So, the speed of the ball after 2 seconds after free fall is <u>20 m/s</u>.

<h3>Introduction</h3>

Hi ! I'm Deva from Brainly Indonesia. In this material, we can call this event "Free Fall Motion". There are two conditions for free fall motion, namely falling (from top to bottom) and free (without initial velocity). Because the question only asks for the final velocity of the ball, in fact, we may use the formula for the relationship between acceleration and change in velocity and time. In general, this relationship can be expressed in the following equation :

\boxed{\sf{\bold{a = \frac{v_2 - v_1}{t}}}}

With the following conditions :

  • a = acceleration (m/s²)
  • \sf{v_2} = speed after some time (m/s)
  • \sf{v_1} = initial speed (m/s)
  • t = interval of time (s)

<h3>Problem Solving</h3>

We know that :

  • a = acceleration = 9,8 m/s² >> because the acceleration of a falling object is following the acceleration of gravity (g).
  • \sf{v_1} = initial speed = 0 m/s >> the keyword is free fall
  • t = interval of time = 2 s

What was asked :

  • \sf{v_2} = speed after some time = ... m/s

Step by step :

\sf{a = \frac{v_2 - v_1}{t}}

\sf{(a \times t) + v_1 = v_2}

\sf{(10 \times 2) + 0 = v_2}

\boxed{\sf{v_2 = 20 \: m/s}}

So, the speed of the ball after 2 seconds after free fall is 20 m/s.

8 0
2 years ago
A 0.335 kg mass is attached to a spring and executes simple harmonic motion with a period of 0.38 s. The total energy of the sys
kramer

Answer:

k=91.54 \frac{N}{m}

Explanation:

The angular speed is defined as the angle traveled in one revolution over the time taken to travel it, that is, the period. Therefore, it is given by:

\omega=\frac{2\pi}{T}\\\omega=\frac{2\pi}{0.38s}\\\omega=16.53\frac{rad}{s}

The angular frequency of the simple harmonic motion of the mass-spring system is defined as follows:

\omega=\sqrt{\frac{k}{m}}

Here, k is the spring's constant and m is the mass of the body attached to the spring. Solving for k:

\omega^2=\frac{k}{m}\\k=m\omega^2\\k=0.335kg(16.53\frac{rad}{s})^2\\k=91.54 \frac{N}{m}

6 0
3 years ago
Hello guys could you please help me with this ASAP??
Lyrx [107]
Placebos are an important part of clinical studies as they provide researchers with a comparison point for new therapies, so they can prove they are safe and effective. They can provide them with the evidence required to apply to regulatory bodies for approval of a new drug.
5 0
2 years ago
Read 2 more answers
Why is the gravitational force usually ignored in problems involving particles such as electrons and protons?
Studentka2010 [4]

Answer:

Because the mass of electrons and protons is very small

Explanation:

The gravitational force exerted between two objects is given by:

F=G\frac{m_1 m_2}{r^2}

where

G=6.67 \cdot 10^{-11} m^3 kg^{-1} s^{-2} is the gravitational constant

m1 and m2 are the masses of the two objects

r is the distance between the two objects

The mass of a proton and of an electron is very small, so the gravitational force involved in case of such particles is very weak. Let's calculate for example the gravitational attraction between one proton and one electron at a distance of r = 1 m. We have:

- Proton mass: m_1 = 1.67 \cdot 10^{-27}kg

- Electron mass: m_2 = 9.11\cdot 10^{-31}kg

So, the gravitational force between the two particles is:

F=(6.67\cdot 10^{-11} m^3 kg^{-1} s^{-2})\frac{(1.67\cdot 10^{-27}kg)(9.11\cdot 10^{-31} kg)}{(1 m)^2}=1.01\cdot 10^{-67}N

Which is a very weak force.

By comparison, let's calculate instead the electromagnetic force between a proton and an electron (both having a charge of q=1.6\cdot 10^{-19}C) still separated by a distance of r = 1 m. We have:

F=k\frac{q_1 q_2}{r^2}=(9.0\cdot 10^9 Nm^2C^{-2})\frac{(1.6\cdot 10^{-19}C)(1.6\cdot 10^{-19}C)}{(1 m)^2}=2.3\cdot 10^{-28}N

Which we see is much stronger than the gravitational force (almost by a factor 10^{40}

4 0
3 years ago
Sound waves are_________Waves.
Anastasy [175]
Sound waves are mechanical(?) waves?
4 0
3 years ago
Read 2 more answers
Other questions:
  • Name three characteristics of scientists that are important to their work but are also found in nonscientists.
    10·1 answer
  • The direction of current in a solenoid depends on the direction of magnetic field’. Do you agree with this statement? Showthe pa
    7·1 answer
  • All but one of the following is an important component of soil.
    11·2 answers
  • What is the frequency of a wave?
    10·2 answers
  • Lila is a track and field athlete. She must complete four laps around a circular track. The track itself is a 400 meter track an
    10·1 answer
  • Two particles execute simple harmonic motion of the same amplitude and frequency along close parallel lines. They pass each othe
    5·1 answer
  • What is used to create the sequential order of elements?
    6·2 answers
  • How do think animals grow from babies to adults
    7·1 answer
  • Is ironing clothes conduction, convection, or radiation?
    9·2 answers
  • Hope you all doing okay
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!