Measuring the heat of chemical reactions or physical changes.
Electric current or electricity
Answer:
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Explanation:
<em>In a class, the teacher asked a student named Mary to mark America on the Globe. Mary did it correctly, now the teacher asked the students "Who found America?" </em>
<em> The students replied.....</em>
<h2>Ma'am Mary found America! </h2>
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Answer:
Olivine, with the formula (Mg,Fe)₂SiO₄
Explanation:
Olivine is a mineral with the formula (Mg,Fe)₂SiO₄. It is a magnesium iron silicate (or ferromagnesian mineral) that constitutes the largest part of the earth's upper mantle. The mantle is the second layer of the earth found in between the core (below) and the crust (on top). It accounts for about 84% of the earth's volume (as regards the layers of the earth).
Answer:
A) 19.994 m B) 1.750 seconds
Explanation:
We are asked about time and height at which both balls pass at the same height. So both, <em>TIME </em>and <em>HEIGHT</em> of both vertical trajectories are the same.
To find the values we use the kinematics expression for vertical motion with constant acceleration, using as the gravity acceleration -9.8 m/s2. Motion downwards is negative and upwards is positive. The reference point is the bottom of the building. The equation is as follow:
For each ball this equation is:
Since the data of the problem is using SI units, then our answers will be expressed in SI units as well. Now, we first compute part B by equaling both equations (same height) and solving for time:
With this time we can find the Height by substituting it in any equation of the balls. In this case, we use the expression of ball B