An automobile (and its occupants) of total mass m = 2000 kg, is moving through a
curved dip in the road of radius r = 20 m at a constant speed v = 20 m/s. for this analysis, you can
neglect air resistance. consider the automobile (and its occupants) as the system of interest. use g =
10 m/s2.

calculate the normal force exerted by the road on the system (car and its occupants).
a) 60,000 n
b) 20,000 n
c) 40,000 n
d) 50,000 n
e) 30,000 n

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.

Describe uniform velocity and variable velocity in short