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givi [52]
3 years ago
6

n a ballistics test, a potato gun shoots a 0.34 kg potato into a 5.0 kg catching cart. The cart recoils at 3.7 m/s after catchin

g the potato. Determine the initial velocity of the potato.
Physics
1 answer:
Gala2k [10]3 years ago
6 0

The initial velocity of the potato is 54.41 m/s.

The given parameters:

  • <em>Mass of the potato, m = 0.34 kg</em>
  • <em>Mass of the cart, m = 5.0 kg </em>
  • <em>Velocity of the recoil, u₂ = 3.7 m/s</em>

<em />

The initial velocity of the potato is calculated by applying the principle of conservation of energy as follows;

m_1u_1 = m_2 u_2\\\\u_1 = \frac{m_2 u_2}{m_1} \\\\u_1 = \frac{5 \times 3.7}{0.34} \\\\u_1 = 54.41 \ m/s

Thus, the initial velocity of the potato is 54.41 m/s.

Learn more about conservation of linear momentum here: brainly.com/question/7538238

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What is the pressure inside such a balloon (in atm) if it starts out at sea level with a temperature of 12.8°C and rises to an a
tatiyna

Answer:

The final pressure inside the balloon will be P_2=0.0359\ atm.

Explanation:

Given initial temperature of the balloon is T_1=12.8\°C

And the final temperature of the balloon is T_2=-47.7\°C

Initially, the balloon is at atmospheric pressure P_1=1\ atm and volume be V_1

And the final pressure in the balloon is P_2 and the volume be V_2

Also, it is given in the question that the final volume became twenty-two times the original volume.

We can write V_2=22V_1

Now, using ideal gas equation.

\frac{P_2V_2}{P_1V_1}=\frac{nRT_2}{nRT_2}

Where, R is the gas constant. And n is moles of substance inside the balloon.

In our problem the value of n will be the same for both cases. Also, R is the gas constant.

\frac{P_2V_2}{P_1V_1}=\frac{T_2}{T_1}

Also, we have V_2=22V_1 from the question.

\frac{P_2\times 22V_1}{P_1V_1}=\frac{T_2}{T_1}\\\\\frac{P_2\times 22}{P_1}=\frac{T_2}{T_1}

We need to convert the temperature from \°C to Kelvin.

T_1=12.8\°C\\T_1=12.8+273.15=285.95\\T_2=-47.7\°C\\T_2=-47.7+273.15=225.45

Plug these values we get,

\frac{P_2\times 22}{1}=\frac{225.45}{285.95}\\\\22\times P_2=0.789\\P_2=\frac{0.789}{22}\\P_2=0.0359\ atm.

So, the final pressure inside the balloon will be P_2=0.0359\ atm.

6 0
3 years ago
according to Bob, on earth, it is 20 ly to planet y. anna has just passed earth, moving at constant speed v in a spaceship. when
eduard

Answer:

300000 KM/Sec

Explanation:

Distance between the Earth and Planet Y = 20 LY

One light year is the distance traveled when traveling at the speed of light which 300000 KM/Sec.

Anna passed the Earth traveling at speed v. After reaching planet Y, she is 20 years older than when she passed Earth. That means she took 20 years to reach planet Y. This is only possible when she traveled with the speed of light

So the velocity v = 300000 KM/Sec.

5 0
3 years ago
Pauline is going on a picnic and bringing some sandwiches. She wants to keep the sandwiches cold for as long as possible by putt
Alja [10]

Answer:

The correct answer is plastic.

Explanation:

To keep sandwiches cold as long as possible by putting them in a cooler the best material is plastic. The plastic is a thermal insulator used for different uses. One of them is to maintain the temperature in closed containers. Metal and aluminum allow the temperature to flow more easily and glass is not a suitable material for building the cooler.

Have a nice day!

5 0
3 years ago
How does an electric iron work when the power is on​
snow_lady [41]

Answer:

The basic principle on which the electric iron works is that when a current is passed through a piece of wire, the wire heats up. This heat is distributed to the sole (base) plate of the electric iron through conduction.

5 0
3 years ago
Minnie sota hits the end of a bar 1. 2 m long with a hammer. Sketch the standing wave on the bar for the following situations. T
ella [17]

(a) The wavelength of the wave for the fundamental mode is 2.4 m.

(b) The fundamental frequency of the wave is 2,708.33 Hz.

<h3>Wavelength of the wave for fundamental mode</h3>

The wavelength of the wave for the fundamental mode is calculated as follows;

Node to Node, N → N = λ/2

L = λ/2

λ = 2L

λ = 2 x 1.2

λ = 2.4 m

<h3>Fundamental frequency of the wave</h3>

The fundamental frequency of the wave is calculated as follows;

f = v/λ

f₀ = v/2L

f₀ = (6500)/(2 x 1.2)

f₀ = 2,708.33 Hz

The diagram of the wave for the fundamental mode is in the image uploaded.

Learn more about wavelength here: brainly.com/question/10728818

5 0
2 years ago
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