A cyclist applies the brakes on her bicycle with a force of -75.0 N. As a result, the bicycle comes to rest after traveling 11.0 m with the brakes applied. How
much work is done by the brakes?
A. -825 J
B. 6.82 N·m
C. 825 J
D. -75.0 N

1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?

Nacidified solution was electrolyzed using copper electrodes. a constant current of 1.18 a caused the anode to lose 0.584 g after 1.52 ✕ 103 s. given that the charge of an electron is 1.6022 ✕ 10−19 c, calculate avogadro's number. assume that copper is oxidized to cu2+ ions.

At what time will the interfering waves have an amplitudeof zero?