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deff fn [24]
3 years ago
9

A ball at the end of a string of 2.2m length rotates at

Physics
2 answers:
Sergio039 [100]3 years ago
4 0

Answer:

The frequency of motion is 5.8 Hz.

Explanation:

frequency of motion of any object is defined as the number of times the object repeats it's motion in 1 second.

mathematically frequency equals f=\frac{1}{T}

where,

'T' is the time it takes for the object to complete one revolution. Since it is given that the ball completes 5.8 revolutions in 1 seconds thus the time it takes for 1 revolution equals \frac{1}{5.8}s

HenceT=\frac{1}{5.8}s

thus the frequency equals

\frac{1}{\frac{1}{5.8}}s^{-1}\\\\f=5.8s^{-1}=5.8Hz

Sunny_sXe [5.5K]3 years ago
3 0

Answer:

5.8 Hz.

Explanation:

<u>Given:</u>

  • The length of the string to which the ball is attached, L = 2.2 m.
  • The number of revolutions, the ball is making in unit time = 5.8 rev/s.

The frequency of the motion of a rotating object is defined the total number of revolutions the object makes in unit time. It is measured in units of Hertz (Hz) or per second.

It is given that the ball is making 5.8 revolutions in one second, therefore, its frequency of motion would be the same, i.e., 5.8 Hz.

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kherson [118]

Answer:

According to Newton's second law of motion, acceleration is directly proportional to force. As the force increases (when mass is constant), the acceleration increases. This can be shown in the following formula.

f = ma

a =  \frac{f}{m}

f = force

m = mass

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3 years ago
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Copper has a specific heat of 0.09 cal/g x C . How much change in temperature would the addition of 8373 cal of heat have on a 5
neonofarm [45]
<h3>Answer:</h3>

172.92 °C

<h3>Explanation:</h3>

Concept being tested: Quantity of heat

We are given;

  • Specific heat capacity of copper as 0.09 cal/g°C
  • Quantity of heat is 8373 calories
  • Mass of copper sample as 538.0 g

We are required to calculate the change in temperature.

  • In this case we need to know that the amount of heat absorbed or gained by a substance is given by the product of mass, specific heat capacity and change in temperature.
  • That is, Q = m × c × ΔT

Therefore, to calculate the change in temperature, ΔT we rearrange the formula;

ΔT = Q ÷ mc

Thus;

ΔT = 8373 cal ÷ (538 g × 0.09 cal/g°C)

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Therefore, the change in temperature will be 172.92 °C

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3 years ago
If it takes 726 watts of power to move an object 36 m in 14 s, what is the mass of the object?
Pavel [41]

Answer:

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4 0
2 years ago
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The voltage across the diode indicates the energy given to charge carriers (electrons and holes, but more about that later in th
Elis [28]

Answer:

the charge carriers have an energy 2.8 10⁻¹⁹ J

Explanation:

The energy in a diode is conserved so the energy supplied must be equal to the energy emitted in the form of photons.

The energy of a photon is given by the Planck expression

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we substitute

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a red photon has a wavelength of lam = 700 nm = 700 10⁻⁹ m

we calculate the energy

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              E = 2.8397 10⁻¹⁹J

therefore the charge carriers have an energy 2.8 10⁻¹⁹ J,

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3 years ago
A man standing on a bus remains still when the bus is at rest. When the bus moves forward and then slows down the man continues
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