Ebuah kereta maglev (magnetic levitation train) bermassa 70 ton digunakan untuk transportasi koloni di mars sepanjang amazonis planitia yang terbentang sekitar 1183 km. jika percepatan gravitasi mars gmars = 3,73 m/s², arus yang digunakan sebesar 7 ampere, maka kuat medan magnet minimum yang diperlukan agar kereta tersebut tetap terapung sepanjang perjalanan t

Which example has gravitational potential energy? a. a horse slowing down from a run b. an apple about to fall from a tree branch c. a bicycle being pedaled down a horizontal path d. beaker sitting on the floor

Most of the volume of an atom is occupied by the

An athlete swings a ball, connected to the end of a chain, in a horizontal circle. the athlete is able to rotate the ball at the rate of 8.13 rev/s when the length of the chain is 0.600 m. when he increases the length to 0.900 m, he is able to rotate the ball only 6.04 rev/s. (a) which rate of rotation gives the greater speed for the ball? 6.04 rev/s 8.13 rev/s (b) what is the centripetal acceleration of the ball at 8.13 rev/s? m/s2 (c) what is the centripetal acceleration at 6.04 rev/s? m/s2