3 years ago

Name and describe the phase change that occurs when dry ice is placed in an open container at room temperature.

1 answer:

4 0

Dry ice or solid carbon dioxide undergoes sublimation. It is a phase change which involves a solid forming to a gas without passing through the liquid phase.

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A ball, initially at rest, reaches a speed of 20 m/s at the bottom of the apparatus. If it takes the ball 10 seconds to reach th

MariettaO [177]

Answer:

2 m/s²

Explanation:

Given:

v₀ = 0 m/s

v = 20 m/s

t = 10 s

Find: a

a = (v − v₀) / t

a = (20 m/s − 0 m/s) / 10 s

a = 2 m/s²

3 0

3 years ago

A spring hangs from the ceiling with an unstretched length of x 0 = 0.35 m . A m 1 = 6.3 kg block is hung from the spring, causi

Jlenok [28]

Answer:

x₂=0.44m

Explanation:

First, we calculate the length the spring is stretch when the first block is hung from it:

$\Delta x_1=0.50m-0.35m=0.15m$

Now, since the stretched spring is in equilibrium, we have that the spring restoring force must be equal to the weight of the block:

$k\Delta x_1=m_1g$

Solving for the spring constant k, we get:

$k=\frac{m_1g}{\Delta x_1}\\\\k=\frac{(6.3kg)(9.8m/s^{2})}{0.15m}=410\frac{N}{m}$

Next, we use the same relationship, but for the second block, to find the value of the stretched length:

$k\Delta x_2=m_2g\\\\\Delta x_2=\frac{m_2g}{k}\\\\\implies \Delta x_2=\frac{(3.7kg)(9.8m/s^{2})}{410N/m}=0.088m$

Finally, we sum this to the unstretched length to obtain the length of the spring:

$x_2=0.35m+0.088m=0.44m$

In words, the length of the spring when the second block is hung from it, is 0.44m.

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4 years ago

8. What is the kinetic energy of a car that has a mass of 1000 kg and is moving at a speed of 30 m/s?

Snezhnost [94]

Answer:

Hope it will help you :)

Explanation:

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3 years ago

The attractive or repulsive force between objects is called

Romashka [77]

The answer to this is electric force. Hope it helps

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3 years ago

When you squeeze together the coils of a spring and then release them, you are creating a ____ wave? transverse compressional wa

mihalych1998 [28]

Answer:

Hey there!

Because you are compressing the spring, these are compressional waves.

Let me know if this helps :)

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3 years ago