An electromagnetic wave strikes a 1.12-cm2 section of wall perpendicularly. the rms value of the wave's magnetic field is determined to be 5.50 Ã 10-4 t. how long does it take for the wave to deliver 2780 j of energy to the wall?

Cathy is pedaling down a steep hill on her bicycle and wants to be able to coast up the next hill, which is 25 meters high, without pedaling. cathy and her bicycle have a mass of 75 kg. assuming her bicycle is 100% efficient, what would her speed have to be?

The earth's magnetic field, with a magnetic dipole moment of 8.0×1022am2, is generated by currents within the molten iron of the earth's outer core. suppose we model the core current as a 3000-km-diameter current loop made from a 1000-km-diameter “wire.” the loop diameter is measured from the centers of this very fat wire.to decide whether this is a large or a small current density, compare it to the current density of a 7.0 a current in a 2.0-mm-diameter wire.

Un satélite artificial de un planeta x tiene un periodo de 8 horas y está colocado a una distancia de 50000 km del centro del planeta. a) ¿cuál es la masa mx del plaeta? b) ¿cuál es el valor de la aceleración de la gravedad del planeta a la distancia en la que está colocado el satélite? c) ¿cuál es la velocidad orbital del satélite? d) si la masa ms del satélite es de 200 kg ¿cuál es su energía de enlace?