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melamori03 [73]

3 years ago

14

The physical and chemical properties of a substance are used to identify the substance and to see how it will behave in the pres

ence of other substances.
Which type of property can be measured without changing the substance into a new substance?

A.
physical property

B.
chemical property

2 answers:

pentagon [3]3 years ago

8 0

Im going to guess on this one, and say that it is chemical.

sweet [91]3 years ago

6 0

<h2>Answer: A) <u><em>Physical property</em></u></h2><h3>Explanation: A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points.</h3>

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Montano1993 [528]

<h2>Answer: 10.52m</h2><h2 />

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$V_{oy}=8.6\frac{m}{s}sin(61\º)=7.521\frac{m}{s}$ (4)

As this is a projectile motion, we have two principal equations related:

<h2>In the x-axis: </h2>

$X=V_{ox}.t$ (5)

Where:

$X=10.1m$ is the distance where the brick landed

$t$ is the time in seconds

If we already know $X$ and $V_{ox}$ , we have to find the time (we will need it for the following equation):

$t= \frac{X}{ V_{ox}}$ (6)

$t=2.42s$ (7)

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$-y=V_{oy}.t+\frac{1}{2}g.t^{2}$ (8)

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$y$ is the height of the building (<u>in this case it has a negative sign because of the reference system we chose)</u>

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Substituting the known values, including the time we found on equation (7) in equation (8), we will find the height of the building:

$-y=(7.521\frac{m}{s})(2.42s)+\frac{1}{2}(-9.8\frac{m}{s^{2}}).(2.42s)^{2}$ (9)

$-y=-10.52m$ (10)

Multiplying by -1 each side of the equation:

$y=10.52m$ >>>>This is the height of the building

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3 years ago

Metal sphere 1 has a positive charge of 7.00 nc . metal sphere 2, which is twice the diameter of sphere 1, is initially uncharge

MariettaO [177]

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