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Fantom [35]
1 year ago
7

A clay ball (mass = 0.25kg) has a rightward momentum of +1.75 kg∙m/s. A second clay ball (mass = 0.25 kg) has a leftward momentu

m of -1.75 kg∙m/s. The two collide, stick together, and come to a complete stop after the collision.1) What was the total energy of the system before the collision?a- Not enough information to determineb- 6.13 Jc- 0 Jd- 12.25 J2) What was the total energy of the system after the collision?a- 6.13 Jb- 12.25 Jc- Not enough information to determined- 0 J3) What was the total momentum before the collision?a- 6.13 kg∙m/sb- 12.25 kg∙m/sc- Not enough information to determined- 0 kg∙m/s4) What was the total momentum after the collision?a- Not enough information to determineb- 0 kg•m/sc- 6.13 kg•m/sd- 12.25 kg•m/s
Physics
1 answer:
julia-pushkina [17]1 year ago
3 0

1)

\begin{gathered} E1=\frac{1}{2}m_1v_1^2+\frac{1}{2}m_1v_2^2 \\ where: \\ m_1=m_2=0.25kg \\ v_1=7m/s \\ v_2=-7m/s \\ so: \\ E1=\frac{1}{2}0.25(7^2)+\frac{1}{2}0.25(7^2) \\ E1=6.125+6.125 \\ E1=12.25J \end{gathered}

Answer:

d. 12.25J

------------------------

2)

According to the conservation of energy:

\begin{gathered} E1=E2 \\ so: \\ E2=12.25J \end{gathered}

Answer:

b. 12.25

-------------------------------

3)

P1=m_1v_2+m_2v_2=+1.75-1.75=0

Answer:

d. 0 kg∙m/s

-----------------------------------------

4)

Using conservation of momentum:

\begin{gathered} P1=P2 \\ so: \\ P2=0 \end{gathered}

Answer:

b. 0 kg•m/s

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Answer:

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Explanation:

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If the normal force become 0 we have

m (g - \frac{v^{2} }{r}) = 0

or

g - \frac{v^{2} }{r} = 0

This way, when FN = 0, then v = vmin, so

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3 years ago
A fire woman dropped a person onto the safety net. Right
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Answer:

m = 28.7[kg]

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v = 11.2 [m/s]

1800=\frac{1}{2}*m*(11.2)^{2}\\m = 28.7[kg]

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The velocity of a passenger relative to a boat is -vpb. The velocity of the boat relative to the river it is moving on is vbr. T
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Answer:

U = 102.8 J (100 J to two significant digits)

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You are making a round trip from City A to City B and back to City A again at constant speed. At what point in the trip is your
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Answer:

Halfway between B and A on the return leg.

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and your total time of travel is t + 3 hrs

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