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Svetlanka [38]
3 years ago
8

Sinkholes can form when

Physics
2 answers:
Sergio [31]3 years ago
8 0

Rain water containing carbon dioxide dissolves underground rock

kherson [118]3 years ago
7 0
Land surfaces change, erosion happens, the ground collapses, etc.
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Can a chemical change be undone?​
Zigmanuir [339]
Because chemical changes result in different substances, they often cannot be undone. Some chemical changes can be reversed, but only by other chemical changes.
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3 years ago
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500 g of water at 90°C is cooled in a freezer. If all the water is converted to ice, what is the amount of heat released when th
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Answer:

356 000 J

Explanation:

Total Energy released

= Energy released when water cools to 0 + Energy released when water is converted to ice at 0

= mcT + ml

= (0.5)(4200)(90-0) + (0.5)(334 000)

= 189 000 J + 167 000 J

= <u>3</u><u>5</u><u>6</u><u> </u><u>0</u><u>0</u><u>0</u><u> </u><u>J</u>

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3 years ago
Explain why viscosity is classified as a physical property
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Answer:

Copper's composition does not change as its shape changes, hence it is a physical feature.

Explanation:

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3 years ago
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A wave is traveling down a string at 15 m/s. A snapshot of the wave is shown in the figure below.
max2010maxim [7]

(a) Amplitude=1.5 m

Amplitude is the maximum distance from the mean (zero disturbance) position.Here amplitude= 1.5 m

(b) wavelength= 2 m

Wavelength is the length of one complete wave or distance traveled by a wave in a time equal to Time Period. Here wavelength= 2 m

(c) Frequency=7.5 Hz

using equation for wave velocity V= f λ

15= f (2)

f=7.5 Hz

so frequency=7.5 Hz

(d) Time period= 0.133 s

Time period= T= 1/f

T= 1/7.5

T=0.133 s

so time period=0.133 s

5 0
3 years ago
An object is moving with constant non-zero acceleration in the +x direction. The velocity versus time graph of this object is wh
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Answer:

A

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a= constant

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