A 4.0Kg box is at rest on a table. The static friction coefficient Us between the box and table is 0.30,and the kinetic friction coefficient Uk is 0.10. Then, a 25N horizontal force is applied to the box.

8. why do radio telescopes convert radio waves (analog signals) to electrical (digital) signals for analysis? (hint: what did the article say about the advantages of digital signals? )

When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.