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Cloud [144]
3 years ago
10

I need help with physics. Question 3 and 4. Thanks.

Physics
1 answer:
shusha [124]3 years ago
6 0
It’s c and a I believe ask someone else to make sure but I’m pretty sure
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How can an athlete participating in a 40m sprint modify and improve their performance based on the kinematic variable of speed a
aleksandrvk [35]

The athlete can improve performance by building strength, coordination and balance.

<h3>Who is an Athlete?</h3>

This is an individual who is proficient in sports and other forms of physical exercise.

Improvement of performance based on the kinematic variable of speed and acceleration can be achieved by building strength, coordination and balance by performing plyometric exercises etc.

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5 0
3 years ago
An open cooking pot containing 0.5 liter of water at 20°C, 1 bar sits on a stove burner. Once the burner is turned on, the water
sesenic [268]

Answer:

a. the time required for the onset of evaporation is: 196.1 seconds and b. the time required for all of the water to evaporate is: 1328.3 seconds.

Explanation:

We need to stablish that there is 3 states at this problem. At the firts one, water is compressed liquid and the conditions for this state are: P1=100KPa,T1=20°C,V1=0.5m^3. From the compressed liquid chart and using extrapolation, we can get: v1=vf1=0.0010018 (m^3/Kg) and u1=uf1=83.95(KJ/kg). Now we can find the mass of water at the state 1 as: m=\frac{V_{1} }{v_{1} } =\frac{0.5*10^{-3} }{0.0010018}=0.5(Kg) Then the liquid water is heated at a rate of 0.85KW, and its volume increase, while work is done by the system at the boundary, we can assume that the pressure remains constant throughout the entire process. At the second state the water is saturated liquid and the conditions are: P2=100KPa, T2=Tsat=99.63°C, v2=vf2=0.001043(m^3/Kg) and u2=uf2=417.36(KJ/Kg). Now we can find the work as:W=mP(v_{2} -v_{1} )=0.5*100*(0.001043-0.0010018)=0.00207(KJ). (a) After that we need to do an energy balance for process 1-2 and get: U=Q-W or m(u_{2} -u_{1} )= Q*t-W, solving for t we get the time required for the onset of evaporation:t=\frac{0.5*(417.36-83.95)+0.00207}{0.85}=196.1(s).(b) Then continue heat transfer to the cooking pot and results in phase change getting vapor at 99.63°C. At the final state or third state the mass is zero because all liquid was evaporated and the initial mass at this state is the same for the second state: 0.5 (Kg) and doing an energy balances results in:(m_{3} u_{3} -m_{2} u_{2})=Q*t-W+( m_{3}-m_{2})h_{e}, but m3=0, now solving for t we can get the time required for all of the water to evaporate as:t=\frac{m_{2}(h_{e}-u_{2})+W}{Q}. We can get from the saturated liquid chart the enthalpy he=hge=2675.5(KJ/Kg) @P=100KPa. Now we need to calculate the work related with the volume decreases as vapor exits the control volume or process 2-3 work boundary as: W=\int\limits^3_2 {p} \, dV= p*(V_{3} -V_{2} )=-m_{2} P_{2} v_{2} =-(0.5)*100*0.001043=-0.0522(KJ). Now replacing every value in the time equation we get:t=\frac{0.5(2675.5-417.36)+(-0.0522)}{0.85}=1328.3(s)

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3 years ago
The speed of sound through glass is 16344 km/hr. What is the wavelength of a sound wave of frequency 824 Hz in glass
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Which statements describe the movement of ocean currents around the globe? check all that apply. strong winds force warm water to sink to the ocean floor. the coriolis effect causes warm and cold water to mix. cool dense water sinks to the ocean floor. warm water replaces cool surface water. wind blowing parallel to the shore causes upwelling of cool water.

Explanation: i think this might help

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I won't touch the object because there is a warning sign and that means you stay out if it because it is a danger sign that High Resistance Material that means it is dangerous.

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Here's link to the answer:

tinyurl.com/wpazsebu

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