Two children push on opposite sides of a door during play. Both push horizontally and perpendicular to the door. One child pushes with a force of 30 N at a distance of 60 cm from the hinges, and the second child pushes at a distance of 45 cm. Assume friction is negligible. The force must the second child exert to keep the door from moving is (A) 40 N (B) 30 N (C) 60 N (D) Cannot be determined

Determine el momento angular de un rueda de 3000g moviendose a 10m/s con un radio de giro de 400cm

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

Two conductors, a and b, are each in the shape of a tetrahedron. but of different sizes. they are charged in the following manner: 1. tetrahedron a is charged from an electrostatic generator to charge q. 2. tetrahedron a is briefly touched to tetrahedron b. 3. steps 1 and 2 are repeated until the charge on tetrahedron b reaches a maximum value. if the charge on tetrahedron b was q/4 after the first time it touched tetrahedron a. what is the final charge qbmax on tetrahedron b?