Classical electromagnetic theory predicted that the energy radiated by a blackbody would became infinite as the wavelength became shorter. What was the contradiction between observation and this result called?

a) A quantum theory.
b) The photoelectric effect.
c) The wave-particle duality.
d) The ultraviolet catastrophe.

A500g object falls off a cliff and losers 100 j from its gravitational potential energy store. if the gravitational field strength g=9.8n/kg, how high is the cliff?

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

Very large accelerations can injure the body, especially if they last for a considerable length of time. one model used to gauge the likelihood of injury is the severity index ( ), defined as =/ . in the expression, is the duration of the accleration, but is not equal to the acceleration. rather, is a dimensionless constant that = the number of multiples of that the acceleration is equal to.in one set of studies of rear-end collisions, a person's velocity increases by 13.7 km/h with an acceleration of 36.0 m/s2 . let the + direction point in the direction the car is traveling. what is the severity index for the collision?