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drek231 [11]
3 years ago
10

A tire measures 20 inches in diameter. How many revolutions will the tire have completed when it has traveled 100 yards? Express

your answer to the nearest whole number.
Physics
1 answer:
Soloha48 [4]3 years ago
8 0
<h2>Number of revolutions required to travel 100 yards is 57.</h2>

Explanation:

Diameter of tire,D = 20 inches

Perimeter of tire = πD

Perimeter of tire = π x 20 = 62.8 inches

Distance traveled = 100 yards

1 yard = 36 inches

Distance traveled = 100 x 36 = 3600 inches

In one revolution it travels 62.8 inches.

\texttt{No of revolutions = }\frac{3600}{62.8}\\\\\texttt{No of revolutions = }57.32\\\\\texttt{No of revolutions = }57

Number of revolutions required to travel 100 yards is 57.

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A certain radar installation tracks airplanes by transmitting electromagnetic radiation of wavelength 4.0 cm.
Anna35 [415]

the wavelength equation is

speed (of light in this case)= wavelength (m) x frequency

3x10^8m/s / .07m = f

frequency= 4 285 714 286 hertz

 

 

 

b) Total distance= 4.8 km (4,800 m)

Speed = 3x10^8 m/s

d=st

t= d/s

t= 4,800 m/3x10^8m/s

<span>t= 1x10^-5 seconds</span>

3 0
3 years ago
Read 2 more answers
One atom has 14 neutrons. Another has 13 neutrons. Both have 13 protons. These atoms are...
agasfer [191]
Hello!

These atoms are isotopes

Isotopes
are atoms with the same number of protons (which determine the atomic number) and a different number of neutrons. These two atoms have the same number of protons (13), but a different number of neutrons, so they are isotopes. 

According to their number of protons, these are Aluminum isotopes: ²⁷Al (stable), and ²⁶Al (radioactive), respectively. 

Have a nice day!

7 0
3 years ago
What charge does an atom have when electrons are lost from the atom?
maw [93]
Negative charge (it has more protons than electrons)
6 0
3 years ago
2. A motor with a resistance of 32 is connected to a voltage source. Four amps of current
FromTheMoon [43]

Answer:128

Explanation:

solve by V=IR formula

V=32 * 4

V= 128

3 0
3 years ago
Define resistance of a conductor. State the factors on which resistance of a conductor depends.
e-lub [12.9K]
<h3>Answer:</h3>

1. Resistance is the opposition offered in a path of flow of current by the atoms or molecules of the conductor.

Factors on which resistance of a conductor depends are:

<h3 />
  • Length R \propto l

  • Area of cross section R \propto \dfrac{1}{A}

  • Nature of the material

2. Rheostat is used to change the resistance without changing the voltage source in an electric circuit.

3.

Given :

\dashrightarrow  l = 50 m

\dashrightarrow  A = 0.01 {mm}^{2}

\dashrightarrow  A = 0.01 \times  {10}^{ - 6}  \:  {m}^{2}

\dashrightarrow   \rho = 5 \times  {10}^{ - 8}          \: \Omega \: m

We know that,

\dashrightarrow  R =  \rho \dfrac{l}{A}

\dashrightarrow  R =  5  \times  {10}^{ - 8} \bigg(\dfrac{50}{0.01 \times  {10}^{ - 6} } \bigg)

\dashrightarrow  { \pink{ \underline{ R = 250  \: \Omega }}}

5 0
2 years ago
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