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vichka [17]
3 years ago
7

In your lab group you combined salt and water. Then you compared what happens when an egg is placed in tap water versus salt wat

er. You observed that the egg floated in the salt water, but sank on the fresh water. You and your lab partner discuss the cause of this difference and wonder if the combining of the salt and water caused a physical or chemical change. Choose ALL of the evidence that supports that a physical change has occurred.
A) gas was produced

B) the density changed

C) the salt dissolved in the water

D) the salt and the water cannot be separated into their individual molecules

E) the salt and the water can still be separated into their individual molecules
Physics
2 answers:
VLD [36.1K]3 years ago
8 0

Answer: B) the density changed

Explanation:

usatestprep

Anestetic [448]3 years ago
7 0

Answer: the density changed, the salt dissolved in the water, the salt and the water can still be separated into their individual molecules.

Explanation: physical changes are changes in size, shape, or state. Another way to think about a physical change is any change not involving a change in the substance’s chemical identity. You cannot write a chemical equation for salt water because the chemical identity is still salt AND water

trust me i did it

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A civil engineer must design a wheelchair-accessible ramp next to a set of steps leading up to a building. The height from the g
Westkost [7]

Answer:

A) B = 24 ft

B) H = 24.08 ft

C) M.A = 12.04

D) P = 13.7 lb

Explanation:

A)

Minimum allowable length of base of ramp can be found as follows:

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where,

Slope = 1/12

H = Height of Ramp = 2 ft

B = Length of Base of Ramp = ?

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B = 2 ft * 12

<u>B = 24 ft</u>

B)

The length of the slope of ramp can be found by using pythagora's theorem:

L = √H² + B²

where,

H = Perpendicular = height = 2 ft

B = Base = Length of Base of Ramp = 24 ft

L = Hypotenuse = Length of Slope of Ramp = ?

Therefore,

H = √[(2 ft)² + (24 ft)²]

<u>H = 24.08 ft</u>

D)

The mechanical advantage of an inclined plane is given by the following formula:

M.A = L/H

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D)

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M.A = W/P

where,

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Therefore,

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P = 165 lb/12.04

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7 0
3 years ago
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Vlad1618 [11]

If you remember the formula for potential energy,
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4 0
3 years ago
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