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valkas [14]
3 years ago
10

CAN SOMEONE PLEASE HELP ME WITH MY PHYSICS QUESTIONS? I NEED CORRECT ANSWERS ONLY! I ALSO NEED SOMEONE TO HELP ME WITH MORE QUES

TIONS
Sally walks 10 meters forward and then 5 meters backwards. Which statement most accurate describes the magnitude of her displacement and distance travelled?

A) Sally's displacement is 5m less than her distance travelled.

B) Sally's displacement is 10m less than her distance travelled.

C) Sally's displacement is 5m greater than her distance travelled.

D) Sally's displacement is 10m greater than her distance travelled.
Physics
2 answers:
vlada-n [284]3 years ago
6 0

Sally started at the starting point.

She walked 10m forward.  So far, she walked 10m, and she was 10m from the starting point.

Then she walked 5m backward.  So far, she walked 15m, but she was only 5m from the starting point.

The distance she walked was 15m.  But her displacement is how far she is from the starting point ... that's only 5m

Displacement = 5 meters

Distance = 15 meters

Displacement is 10m less than distance walked.  <em>(B)</em>


===> If she kept going and walked <u><em>another </em></u>5m backward, she would be back where she started.  The total distance she walked would be 20m, and her displacement would be zero !

Zielflug [23.3K]3 years ago
5 0

The Answer Is B)


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Consider an elevator with a table and a book on top of the table. The mass of the table is 10kg and the mass of the book is 2kg.
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                Σ F = m a

Where the bold letters indicate vectors, m is the mass and the acceleration of the body

A free body diagram is a diagram where the forces are represented without the details of the bodies, in the attached we can see a free body diagram of the system.

Let's start by finding the acceleration of the elevator with kinematics  

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This is the reaction of the earth to the support of the block and the table

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In conclusion using Newton's second law we can find the forces of the block on the table is 126 N

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