Why does a nuclear fission reaction generally not result in an uncontrolled chain reaction? A: A chain reaction requires densely packed nuclei.
B: Nuclear fission does not produce daughter particles.
C: Neutrons easily pass through most other types of matter.
D:Matter is converted to energy during the reaction.

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied.

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.

The speed of light can be used to measure the