A system consists of electrons and protons only. The number of electrons is 10 and the charge of the system is +2e. Find the mass
of the system. Given that mass of proton is 1.67 × 10−27kg.

Aforce of 9.00 newtons acts at an angle of 19.0 to the horizontal. what is its component in the horizontal direction?

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?

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?