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geniusboy [140]
3 years ago
9

During a camping trip, Sierra collected dry branches and broke them into smaller pieces. She then placed the sticks in a fire pi

t and used a match to light the sticks on fire. Next, she propped a metal pan of water over the fire and heated it until the water boiled. Which list correctly describes physical and chemical changes that occurred in this scenario? physical change: breaking sticks chemical changes: lighting the fire, boiling water physical change: boiling water chemical change: breaking sticks, lighting the fire physical changes: lighting the fire, boiling water chemical change: breaking sticks physical changes: breaking sticks, boiling water chemical change: lighting the fire
Physics
1 answer:
viktelen [127]3 years ago
8 0
Physical changes: breaking sticks, boiling the water
chemical changes: lighting the fire
(Breaking the wood does not change the substance of the wood , therefore it's a physical change. Water changing between solid, liquid, and gas form is always a physical change.)
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Two blocks A and B have a weight of 11 lb and 5 lb , respectively. They are resting on the incline for which the coefficients of
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Answer:

\theta=10.20^{\circ}  

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Explanation:

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16sin(\theta)-2.91cos(\theta)=0  

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Now, if we do a free body diagram of block A we have that after the block moves, the spring force must be taken into account.  

P_{A}sin(\theta)-F_{fA}-F_{spring}=0

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P_{A}sin(\theta)-0.16*11cos(\theta)-2.1\Delta l=0

\Delta l=\frac{11sin(\theta)-0.16*11cos(\theta)}{2.1}

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I hope it helps you!

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Answer:

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