What is the kinetic energy of a 620.0 kg roller coaster moving with a velocity of 9.00 m/s?

Why is there friction between objects

Explain what makes a passenger in a turning car slide toward the door. critical thinking

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.