În figura alăturată este redată dependenţa de timp a vitezei unei mingi cu masa m = 0,1kg , care cade de la o înălţime h .
a. Determinaţi acceleraţia mingii.
b. Determinaţi forţa de rezistenţă la înaintare întâmpinată de minge.
c. Determinaţi distanţa parcursă de minge între momentele 0,5s şi 1,5s .
d. Presupunând că forţa de rezistenţă se poate exprima prin relaţia F k v r = ⋅ , unde k = 0,05 N ⋅ s / m ,
determinaţi valoarea vitezei mingii începând de la care căderea acesteia ar avea loc cu acceleraţie nulă.

Date chapter motion and speed review part a. vocabulary review directions: write the terms that match each description below in thes complete the sentence in number 13. ich each description below in the spaces provided. the boxed letters will 1. equal forces acting in opposite directions (2 words) 2. occurs when an object's velocity decreases (2 words) 3. sum of all forces acting on an object (2 words) 4. total distance divided by total time (2 words) 5. name for the slant of a line on a graph 6. distance divided by time 7. a push or a pull exerted on a body or object 8. distance and direction of an object from its starting point 9. tendency to resist change in motion 10. measure of how far an object has moved 11. speed and direction of motion 12. rate of change of position at a specific point in time (2 words) 13. the rate of change in velocity is called motion and spe

Imagine you are riding on a yacht in the ocean and traveling at 20 mph. you then hit a golf ball at 100 mph from the deck of the yacht. you see the ball move away from you at 100mph, while a person standing on a near by beach would observe your golf ball traveling at 120 mph (20 mph + 100 mph). now imagine you are aboard the hermes spacecraft traveling at 0.1c (1/10 the speed of light) past mars and shine a laser from the front of the ship. you would see the light traveling at c (the speed of light) away from your ship. according to einstein’s special relativity, how fast will a person on mars observe the light to be traveling? a) 0.1c (1/10 the speed of light) b) c (the speed of light) c)1.1c (c+0.1c)

Which of the following list the divisions of the geologic time scale in order from longest to shortest