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Viktor [21]
4 years ago
6

When water freezes, the density decreases and the bonds between molecules become stronger. Do you expect the speed of sound to b

e greater in liquid water or in water ice?
Physics
1 answer:
Simora [160]4 years ago
4 0

Answer:

The speed of sound is greater in water ice

Explanation:

This is because water ice is in its solid form and sound travels faster in solids. This is due to its molecules being tightly packed together than in a liquid. The tightly packed molecules help sound collide quickly through it whereas in liquids the molecules aren’t tightly packed compared to a solid and the sound waves takes more time colliding through it.

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A boy pushes on a box of mass 39 kg and it moves at an acceleration of 7.8m/s2. With what force does the boy push on the box?
expeople1 [14]
F = ma, where m is the mass of the body and a its acceleration.
So F = 39x7.8 = 280.8 N
5 0
4 years ago
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Tectonic plates move due to _____ forces.
wel
<span>Tectonic plates move because they are floating on top of the liquid mantle. The mantle itself moves due to convection currents: hot rock rises, gives off some heat, then falls. This creates vast swirls of moving liquid rock under the crust of the earth, which jostles the plates of crust on top.
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3 years ago
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6. A 4 kg object hangs below a 6 kg object by a string of negligible mass. If the 6 kg object is pulled upward by a force of 440
MrRissso [65]

Answer:

T =176 N

Explanation:

from diagram

F -(m_1+m_2_g) = (m_1+m_2_g)a

440 - (6+4)g = (6+4)a

a =\frac{440-10*9.8}{10}

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T -m_2g =m_2a

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T = 4(9.81+34.2)

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7 0
4 years ago
A car travels at 15 m/s for 30 minutes. How far did it travel?
Brilliant_brown [7]

Answer:

27000 meters

Explanation:

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5 0
3 years ago
Which of these experiments tests a chemical property of an object??
Ilia_Sergeevich [38]
<span>B. shining a bright light on the objects and testing for decomposition </span> <span>      

In explanation, chemical property is a characteristic of a certain substance came from an outcome due to chemical change or reaction. In the situation above, more specifically toxicity is involved in the chemical property/change. Hence, when the object is tested for decomposition. Like for an example of decomposition simply in metals, rusting. Rusting a process of degeneration of metals. Here it works the same. Toxicity is how much damage did a certain entity do to the object. </span>



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3 years ago
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