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mixer [17]
4 years ago
5

) In physics, an object that is in motion is said to have kinetic energy. The following formula can be used to determine a movin

g object’s kinetic energy: KE = ½ mv2 The variables in the formula are as follows: KE is the kinetic energy, m is the object’s mass in kilograms, and v is the object’s velocity, in meters per second. Write a method named kineticEnergy that accepts an object’s mass (in kilograms) and velocity (in meters per second) as arguments. The method should return the amount of kinetic energy that the object has. Demonstrate the method by calling it in a program that asks the user to enter values for mass and velocity.
Physics
1 answer:
Otrada [13]4 years ago
5 0

Answer:

using MATLAB

%program to calculate the kinetic velocity of a body of mass

% kinetic energy is given by 1/2*(m*v^2)

%m= mass of body in kilogram

%v= velocity of body in m/s

prompt= 'mass of body=';

m= input(prompt); %command to request user to input mass value

prompt='velocity of body=';

v= input(prompt);%command to request user to input velocity value

Ke= 1/2 * m* (v^2);

display(Ke)

Explanation:

running the code, u would be prompted to input values after the equality sign, just enter without space and your result would be displayed

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An electromagnetic wave travels in a vacuum. The wavelength of the wave is tripled. How is this accomplished? by tripling the fr
makkiz [27]

Answer:

by reducing the frequency of the wave by a factor of three

Explanation:

Speed = wavelength * frequency.

Wavelength = speed/frequency

The speed of an electromagnetic wave in a vacuum is constant. Meanwhile the wavelength and frequency have an inverse relationship which means for every rise in any of the parameters there will also be a corresponding fall.

Since the wavelength is tripled then the frequency will also be reduced by a factor of 3

4 0
3 years ago
Rod AB has a diameter of 200mm and rod BC has a diameter of 150mm. Find the required temperature increase to close the gap at C.
Leni [432]

Answer:

T&=\frac{\sigma_{AB}+\sigma_{BC}}{2\alpha E}

Explanation:

The given data :-

  • Diameter of rod AB ( d₁ ) = 200 mm.
  • Diameter of rod BC ( d₂ ) = 150 mm.
  • The linear co-efficient of thermal expansion of copper ( ∝ ) = 1.6 × 10⁻⁶ /°C
  • The young's modulus of elasticity of copper ( E ) = 120 GPa = 120 × 10³ MPa.
  • Consider the required temperature increase to close the gap at C = T °C
  • Consider the change in length of the rod = бL

Solution :-

\begin{aligned}\sum H& =0\\-R_A+R_C&=0\\R_A&=R_C\\R_A&=R\\R_C&=R\\R_{A}&=\text{reaction\:force\:at\:A}\\R_{C}&=\text{reaction\:force\:at\:C}\\\sigma_{AB}&=\text{axial\:stress\:at\:A}\\\sigma_{BC}&=\text{axial\:stress\:at\:B}\\\sigma_{AB}&=\frac{R}{A_{A}}\\&=\frac{R_{A}}{A_{A}}\\\sigma_{BC}&=\frac{R_{B}}{A_{B}}\\&=\frac{R}{A_{B}}\\\frac{\sigma_{AB}}{\sigma_{BC}}&=\frac{A_{B}}{A_{B}}\\&=\frac{\frac{\pi}{4}\cdot 150^{2}}{\frac{\pi}{4}\cdot 200^{2}}\\&=\frac{9}{16}\end{aligned}

\begin{aligned}\delta L&= (\delta L _{thermal} +\delta L_{axial})_{AB} + ( \delta L _{thermal} +\delta L_{axial})_{BC}\\0& = (\delta L _{thermal} +\delta L_{axial})_{AB} + ( \delta L _{thermal} +\delta L_{axial})_{BC}\\&=\left[\alpha\:T\:L+\left(\frac{-RL}{AE}\right)\right]_{AB}+\left[\alpha\:T\:L+\left(\frac{-RL}{AE}\right)\right]_{BC}\\&=2\:\alpha\:T\:L-\frac{L}{E}(\sigma_{AB}+\sigma_{BC})\\T&=\frac{\sigma_{AB}+\sigma_{BC}}{2\alpha E}\end{aligned}

5 0
4 years ago
Which best describes solubility? the speed at which a substance dissolves the ability of one substance to dissolve in another th
ycow [4]

<u><em>Answer:</em></u>

The ability of a substance to dissolve into another, called the solvent.

<u><em>Explanation:</em></u>

That is why water is called <u><em>"the universal solvent."</em></u>

Because it can dissolve almost anything.

The speed and temperature have nothing to do with solubility.

4 0
2 years ago
Suppose a candle is burning, and wind is blowing on one side of the flame. Which principle explains why the flame bends toward t
Mekhanik [1.2K]

When a candle is burning and wind is blowing it on one side of the flame, which causes the flame to bend towards the wind is an example of Bernoulli’s principle. The principle explain that the higher the speed, the lower the pressure becomes. When you blow against one side of the flame, you are creating an area of low pressure. The relatively high-pressure air on the other side of the candle will rush over to fill the area of low pressure that causes the flame to be pushed in the direction of the blowing.

4 0
3 years ago
Which of the following is not a way to make exercising on a cold day safer?
IRISSAK [1]

Answer:

D.

Explanation:

I think its D. because Tea during a cold workout isnt safe at all. Drinking tea while working out adds weight and you just simply dont need tea when working out.. Hope this helps man :)

4 0
3 years ago
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