Answer:
She is measuring her speed
Explanation:
Speed is defined as the ratio between the distance covered divided by the time taken to cover that distance:
where
d is the distance covered
t is the time taken
Since Mary is measuring how far she can run in a given period of time, she is measuring the distance she can travel (d) in a given time (t), so she is measuring her speed.
<u>Answer: </u>Chemical energy, electrical energy, and Mechanical energy (Kinetic energy).
<u>Explanation:</u>
When Simon puts new batteries in his radio controlled car and its controller, the<u> chemical energy to electrical energy</u> which activates the controller. The controller sends a radio signal and the car starts moving. This means that the <u>electrical energy </u> is received by the car and car starts moving. <u>The electrical energy converts into mechanical energy </u>(kinetic energy).
No correlation because it is neither positive or negative. The dots are scattered so that would be no correlation.
Answer:
Approximately .
Explanation:
Consider two objects of mass and . Let denote the distance between the center of mass of each object. Let denote the gravitational constant. (.)
By Newton's Law of Universal Gravitation, the size of gravitational attraction between these two objects would be:
.
In this question, and are the mass of the two planets. The distance between the two planets is (approximately the same as the distance between the center of mass of planet Earth and the center of mass of Mars.)
Apply Newton's Law of Universal Gravitation to find the size of gravitational attraction between the two planets:
.
Since , the size of gravitational attraction between the two planets would be approximately .