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a_sh-v [17]
3 years ago
9

Two types of positions are

Physics
1 answer:
bearhunter [10]3 years ago
8 0

Answer:

Permanent or temporary just took the test

Explanation:

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Metals are good conductors of electricity because they _________
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Metals are good conductors because the molecules that are inside the metal are tightly packed together. This is why the heat moves through the metal quickly.

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What is the mass of a tennis ball traveling with a velocity of 3 m/s and a momentum of
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Explanation:

P = mv  

m = P/v

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In a light interference pattern, alternate dark and bright fringes are seen. Why are the bright fringes formed?
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The light interference pattern is a series of light and dark stripes.

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4 years ago
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Sarah is making bread. She measures 0.6 kg of hot water into a bowl. The water needs to be at a temperature of
Mrrafil [7]

Answer:

\Delta m = 0.171\,kg

Explanation:

The process of water adding is described by the First Law of Thermodynamics:

m_{w,o} \cdot h_{w,o} + \Delta m \cdot h_{w} = (m_{w,o} + \Delta m)\cdot h_{w,f}

The amount of additional mass is:

m_{w,o}\cdot h_{w,o} - m_{w,o}\cdot h_{w,f} = \Delta m\cdot (h_{w,f}-h_{w})

\Delta m = \frac{m_{w,o}\cdot(h_{w,o}-h_{w,f})}{h_{w,f}-h_{w}}

Given that water is incompressible, the equation can be further simplified:

\Delta m = m_{w,o}\cdot \frac{c_{p,w}\cdot (T_{w,o}-T_{w,f})}{c_{p,w}\cdot (T_{w,f}-T_{w})}

\Delta m = m_{w,o}\cdot \left(\frac{T_{w,o}-T_{w,f}}{T_{w,f}-T_{w}} \right)

\Delta m = (0.6\,kg)\cdot \left(\frac{40 ^{\circ}C - 42^{\circ}C}{42^{\circ}C-49^{\circ}C} \right)

\Delta m = 0.171\,kg

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3 years ago
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