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
DerKrebs [107]
3 years ago
7

Estimate the number of dollar bills (15.5 cm wide), placed end to end, that it would take to circle the Earth (radius = 6.40 × 1

03 km).
Physics
1 answer:
marishachu [46]3 years ago
3 0

Answer:

 #_bills = 2.59 10⁸  Bills

Explanation:

For this exercise we must calculate the length of the Earth's circle

        L = 2π r

Let's reduce to the SI system

        r = 6.40 10³ km (1000m / 1km) = 6.40 10⁶ m

        d = 15.5 cm (1m / 100cm) = 0.155 m

        L = 2π 6.40 10⁶

        L = 40.21 10⁶ m

now we can use a direct rule of proportions (rule of three). If 1 bill has d = 0.155, how much bill will have L

       #_bills = 1 L / d

       #_bills = 1 40.21 10⁶6 / 0.155

       #_bills = 2.59 10⁸  Bills

the total number of bills is  2.6 10⁸ bills

You might be interested in
1.2 Define the following terms and in each case give the symbol and the unit: 1.2.1 wavelength (4) ·​
Alex777 [14]
  • Wavelength is represented by lambda(\lambda)

\\ \bull\tt\longmapsto \lambda=\dfrac{c}{v}

  • C is speed of light in air.
  • v is the frequency.

It has unit as meter(m)

8 0
2 years ago
Two trains travel toward each other on the same track, beginning 100 miles apart. One train travels at 40 miles per hour; the ot
Paladinen [302]

D = distance between th two trains at the start of the motion = 100 miles

V = speed of the faster train towards slower train = 60 mph

v = speed of the slower train towards faster train = 40 mph

t = time taken by the two trains to collide = ?

time taken by the two trains to collide is given as

t = D/(V + v)

t = 100/(60 + 40) = 1 h

v' = speed of the bird = 90 mph

d = distance traveled by the bird

distance traveled by the bird is given as

d = v' t

d = 90 x 1

d = 90 miles

7 0
3 years ago
Read 2 more answers
Which of the following is one way of preventing poisoning?
Iteru [2.4K]
I think its number 1

7 0
3 years ago
A spring with spring constant 11.5 N/m hangs from the ceiling. A 490 g ball is attached to the spring and allowed to come to res
Natalija [7]

Answer:

The time constant is \tau = 17.5 \ s    

Explanation:

From the question we are told that

   The spring constant is  k = 11.5 \  N/m

   The mass  of the ball is  m_b  = 490 \ g  = 0.49 \ kg

   The amplitude of the  oscillation t the beginning is x =  6.70 cm = 0.067 \  m

    The amplitude after time t is  x_t = 2.20 cm = 0.022 \  m

    The number of oscillation is N  = 30

Generally the time taken to attain the second amplitude is mathematically represented as

       t  = N  *  T                                            Here  T is the period of oscillation

         t = N * 2\pi \sqrt{\frac{m}{k} }

=>     t = 30 * 2 * 3.142 *  \sqrt{\frac{ 0.490}{11.5} }

=>     t = 38.88 \  s

Generally the amplitude at time t is mathematically represented as

         x(t) = x e^{-\frac{at}{2m} }

Here a is the damping  constant so

 at  t = 38.88 \  s ,  x_t = 2.20 cm = 0.022 \  m

So  

     0.022 = 0.067 e^{-\frac{a * 38.88}{2 * 0.490} }

=>  0.3284 = e^{-\frac{a * 38.88}{2 * 0.490} }

taking natural log of both sides

=>  ln(0.3284 ) = -\frac{a * 38.88}{2 * 0.490} }    

=>   a = 0.028

Generally the time constant is mathematically represented as

    \tau = \frac{m}{a}      

=> \tau = \frac{0.490}{  0.028}    

=> \tau = 17.5 \ s    

4 0
3 years ago
If the second harmonic of a certain string is 42 Hz, what is the fundamental frequency of the string?
stich3 [128]
I would think that you would have to do 42/2=21Hz, but I'm not sure...
5 0
3 years ago
Other questions:
  • When Anna eats an apple, the sugars in that apple are broken down into the substance called glucose. Glucose is then burned in h
    7·2 answers
  • Compare and contrast a series and parallel circuit. Give at least one way that they are alike and one way that they are differen
    13·2 answers
  • What is the area of 12 1/2 and 17 1/5
    9·1 answer
  • Potential difference is measured in which units?<br> volts<br> amps<br> currents<br> watts
    9·2 answers
  • A wave that is traveling fast can be said to have a high ___
    7·1 answer
  • The Voltage difference of a circuit is 16V and the resistance is 120 ohms. What is the current in the circuit? Show me your work
    15·1 answer
  • Two technicians are discussing headlights. Technician A says that the electricity creates electromagnetic energy in the filament
    6·1 answer
  • PLEASE HELP I WILL GIVE 50 PTS AND GIVE BRAINLIEST
    14·2 answers
  • What makes a planet different from other celestial bodies?.
    12·1 answer
  • In the diagram below astronauts on different planets are dropping apples.
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!