Nervous, a person is pacing back and forth. If the person paces 19.3 m north, then 8.6 m south, followed by 4.3 m north again, what is the person's overall displacement? Assume all values are to the nearest tenth and north is the positive
direction.

Explain why the aperture of the spherical mirror should be small compared to the radius of curvature of the mirror.

Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.

An equinox occurs when a. neither end of earth's axis is tilted toward or away from the sun. b. the north end of earth's axis is tilted away from the sun. c. the north end of earth's axis is tilted toward the sun. d. earth's axis is parallel to the sun's rays. select the best answer from the choices provided a b c d