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Fofino [41]
3 years ago
14

HELP PLZZZ

Physics
1 answer:
jeka943 years ago
8 0
Q-W=change in internal energy,closed system

1700-600=900j
this demonstrates the conservation energy as there is energy is no destroyed,instead energy is converted from one form to another and in this case the leftover energy of the system is the increase in internal energy of the system
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As the distance between two objects decreases, what happens to the force of gravity between the two objects
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The force of gravity between them increases.
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How many minutes will it take to drive to los angeles from san francisco if an average speed of 72mi/hr is maintained?
Sholpan [36]
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What storm causes flash floods? <br> Tornado <br> Thunderstorm<br> Hurricane
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hurricane.

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............................

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An 89.0 kg fullback moving east with a speed of 5.6 m/s is tackled by an 85.0 kg opponent running west at 2.84 m/s, and the coll
Korolek [52]

Answer:

a. v_f=1.477m/s

b. ΔK=1558.3J

c. E_k=1034.7 J

Explanation:

a).

Momentum conserved

p_{ix}=p_{fx}

m_1*v_1+m_2*v_2=(m_1+m_2)*v_f

v_f=\frac{m_1*v_1+m_2*v_2}{m_1+m_2}

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v_f=1.477m/s

b).

ΔK=K_i-K_f

\frac{1}{2}*m_1*v_1^2+\frac{1}{2}*m_2*v_2^2=\frac{1}{2}*(m_1+m_2)*v_f^2

\frac{1}{2}*89.0kg*(5.6m/s)^2+\frac{1}{2}*85.0kg*(2.84m/s)^2=\frac{1}{2}*(89.0+85.0)kg*(1.447m/s)^2

ΔK=1558.3J

c).

E_k=\frac{1}{2}*89kg*(5.8m/s)^2-\frac{1}{2}*(85+89)kg*(1.44m/s)^2

E_k=1034.7 J

d).

All of which has been lost as mechanical energy, and is now thermal energy warmer football players, noise a loud crunch for example.

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