Most tornadoes carry wind speeds that range from
a. 267 to 322 km per hour.
b. 1 to 105 km per hour.
c. 178 to 266 km per hour.
d. 105 to 177 km per hour.

Avery hard rubber ball (m = 0.5 kg) is falling vertically at 4 m/s just before it bounces on the floor. the ball rebounds back at essentially the same speed. if the collision with the floor lasts 0.05 s, what is the average force exerted by the floor on the ball?

The act of moving from one place to another. a. locomotor b. aerobic c. stationary d. static

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.