Pelden pushes a box of mass 30 kg with a force of 60 N. What is the acceleration of the box?
A 1 ms2
B 2 ms2
C 0.5 ms 2
D 1800 ms 2​

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.

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer

Consider a hydrogen atom in the ground state. what is the energy of its electron? =e= jj now consider an excited‑state hydrogen atom. what is the energy of the electron in the =5n=5 level? =e5= j