TEMĂ: Compunerea forțelor de aceeași direcție Reprezintă la scară forțele concurente F1 și F2 de module :

a. F1 = 3N și F2 = 7N, când unghiul dintre ele este de zero grade

b. F1 = 4N și F2 = 9N, când unghiul dintre ele este de 180 grade

Construiește rezultanta celor două forțe concurente pentru fiecare dintre punctele a și b utilizând regula triunghiului.

AJUTATIMA VA ROG

When the velocity of an object is doubled, by what factor is its momentum changed? by what factor is its kinetic energy changed? a) the momentum is zero. b) the momentum is not zero. c) difficult to say.

Thomas his older brothers, who own a junk yard, on the weekends to earn extra money. he likes to them push broken-down cars to the back of the junk yard because it makes him feel strong. last saturday, they pushed three cars with different weights, and he noticed he used different amounts of force for each one. the cars were the following weights: white car: 2,700 kg red car: 1,500 kg blue car: 2,100 kg think about how much force is needed to move each car. which correctly lists the cars in order from the most to least amount of force needed to move them? a) white, blue, red b) blue, red, white c) red, white, blue d) white, red, blue

Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. the scale reads 830 n for the first 2.4 s after the elevator starts moving, then 930 n for the next 2.4 s. part a what is the elevator's speed 4.8 s after starting? express your answer with the appropriate units.