The moon has a mass of 3.45x10^22 Kg and a radius of 1.74x10^6 m. If a 3000 Kg spaceship is on the surface of the moon, what would be the gravitational force between the ship and the moon?

In a hydrogen molecule there are a total of four charges, 2 protons in the two nuclei, and 2 electrons. how many unique charge-pairs are there (without double counting)?

In an old-fashioned amusement park ride, passengers stand inside a 3.0-m-tall, 5.0-m-diameter hollow steel cylinder with their backs against the wall. the cylinder begins to rotate about a vertical axis. then the floor on which the passengers are standing suddenly drops away! if all goes well, the passengers will “stick” to the wall and not slide. clothing has a static coefficient of friction against steel in the range 0.60 to 1.0 and a kinetic coefficient in the range 0.40 to 0.70. part a what is the minimum rotational frequency, in rpm, for which the ride is safe? express your answer using two significant figures. f f = rpm

Bahan yang digunakan mencegah terjadinya polarisasi pada batu baterai a. larutan h2so4b. mncl2 dan serbuk karbonc. pbso4d. nh4cl