Two objects 5kg and 7kg are attached to the ends of an inextensible string which passes over a frictionless pulley such that 5 kg is moving over a frictionless horizontal surface and the mass 7 kg is moving vertically downwards. Find the acceleration in the system and tension in the string.

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.

total distance/total time

(85 + 82)/(5+3)

167/8

20 just over

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.