Una niña en un trineo que suman en total 58 kg están siendo arrastrados hacia arriba por una pendiente de 12°. Si se ignora la fricción, ¿Qué potencia se requiere para que la niña junto con el trineo cubran en 4.5 min la pendiente completa,
que tiene una longitud de 1.20 km?

What are the north and south poles of a solenoid change with?

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?

Asign is hung between two cables as illustrated below. if the sign weighs 350 n, what is the tension (in n) in each cable?